# Patent

## Title
Oxazine derivatives and their use in the treatment of neurological disorders

## Abstract

The invention relates to novel heterocyclic compounds of the formula




in which all of the variables are as defined in the specification, in free form or in salt form, to their preparation, to their medical use and to medicaments comprising them.

## Background
Alzheimer's Disease is a devastating neurodegenerative disorder. Its sporadic forms affect an elderly population (sharp increase in incidence at >75 years of age), in addition, there are various familial forms with an onset of the disease in the fourth or fifth decade of life. Pathologically, it is characterized by the presence of extracellular senile plaques, and intracellular neurofibrillar tangles in patient's brains. The core constituent of the senile plaques are small, 4 kDa amyloid peptides. They are generated by the proteolytic processing of a large transmembrane protein, amyloid precursor protein (APP). Cleavage of APP by beta-secretase (BACE-1) releases the soluble APP-beta fragment, while the 99-amino acid long C-terminus remains tethered to the membrane. This C-terminal fragment is subsequently proteolytically processed by gamma-secretase (an membrane multi-enzyme complex) to generate amyloid peptides of various length, predominantly 40 and 42 amino acids long (Hardy J, Selkoe D J (2002) Science; 297 (5580):353-356).
If, under pathologic conditions, the generation of these peptides occurs at an increased rate, or if their removal from the brain is disturbed, increased brain amyloid peptide concentrations leads to the formation of oligomers, fibrils and eventually plaques (Farris W, et al (2007) Am. J. Pathol.; 171 (1):241-251). It has been shown, that deposition of amyloid peptides and plaques in the brain is the first measurable event in the pathogenesis of Alzheimers Disease, and that it is the trigger for loss of synapses, synaptic contacts, and neurons (Grimmer T, et al (2009) Neurobiology of Aging; 30 (12):1902-1909). Brain atrophy caused by massive neuron loss is followed by impairments in cognition, memory, orientation and the ability to perform the tasks of daily living, i.e. clinically manifest dementia (Okello A, et al (2009) Neurology; 73 (10):754-760).
BACE-1, also known as Asp2 or Memapsin 2, is a transmembrane aspartic protease highly expressed in neurons. It co-localizes with its substrate APP in Golgi and endocytic compartments (Willem M, Lammich S, Haass C (2009) Semin. Cell Dev. Biol; 20 (2):175-182). Knock-out studies in mice have demonstrated the absence of amyloid peptide formation, while the animals are healthy and fertile (Ohno M, et al (2007) Neurobiol. Dis.; 26 (1):134-145). Genetic ablation of BACE-1 in APP-overexpressing mice has demonstrated absence of plaque formation, and the reverse of cognitive deficits (Ohno M, et al (2004) Neuron; 41 (1):27-33). BACE-1 levels are elevated in the brains of sporadic Alzheimer's Disease patients (Hampel H, Shen Y (2009) Scand. J. Clin. Lab. Invest.; 69 (1):8-12).
Taken together, these findings suggest that the inhibition of BACE-1 may be a favourable therapeutic strategy for Alzheimer's Disease.
The present invention relates to novel oxazine derivatives having BACE inhibitory activity, to their preparation, to their medical use and to medicaments comprising them.
More particularly, in a first aspect, the invention relates to a compound of the formula




in which

    
    
        X is O or S;
        R1 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        R2 is an aryl, heteroaryl or non-aromatic heterocyclyl group G1, which group G1 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy, (C2-8)alkynoxy and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;
        R3 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        either
        R4 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl; and
        R5 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        or
        R4 and R5, taken together, are —C(H)═C(H)—C(H)═C(H)— or a (C1-8)alkylene group, in which (C1-8)alkylene group 1 or 2 —CH2— ring members are optionally replaced with hetero ring members independently selected from the group, consisting of —N(H)—, —N[(C1-8)alkyl]-, —O—, —S—, —S(═O)— or —S(═O)2—;
        R6 is hydrogen; (C1-8)alkyl; halogen-(C1-8)alkyl; hydroxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkyl; mercapto-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkyl; amino-(C1-8)alkyl; N—(C1-8)alkylamino-(C1-8)alkyl; N,N-di-[(C1-8)alkyl]amino-(C1-8)alkyl with two identical or different (C1-8)alkyl moieties in the N,N-di-[(C1-8)alkyl]amino moiety; (C2-8)alkenyl; or (C2-8)alkynyl;
        E1 is —C(R7)(R8)—; or —C(R7)(R8)—C(R9)(R10)—;
        E2 is —C(R11)(R12)—; or —C(R11)(R12)—C(R13)(R14)—;
        either
        each of R7 and R8 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R7 and R8, taken together, are oxo or —CH2—CH2—;
        either
        each of R9 and R10 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R9 and R10, taken together, are oxo or —CH2—CH2—;
        either
        each of R11 and R12 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R11 and R12, taken together, are oxo or —CH2—CH2—; and
        either
        each of R13 and R14 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R13 and R14, taken together, are oxo or —CH2—CH2—,

in free form or in salt form.

    
    


In a second aspect, the invention relates to a compound of the formula




in which

    
    
        R1 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        R2 is a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G1, which group G1 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;
        R3 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        either
        R4 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl; and
        R5 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        or
        R4 and R5, taken together, are —C(H)═C(H)—C(H)═C(H)— or a (C1-8)alkylene group, in which (C1-8)alkylene group 1 or 2 —CH2— ring members are optionally replaced with hetero ring members independently selected from the group, consisting of —N(H)—, —N[(C1-8)alkyl]-, —O—, —S—, —S(═O)— or —S(═O)2—;
        R6 is hydrogen; (C1-8)alkyl; halogen-(C1-8)alkyl; hydroxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkyl; mercapto-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkyl; amino-(C1-8)alkyl; N—(C1-8)alkylamino-(C1-8)alkyl; N,N-di-[(C1-8)alkyl]amino-(C1-8)alkyl with two identical or different (C1-8)alkyl moieties in the N,N-di-[(C1-8)alkyl]amino moiety; (C2-8)alkenyl; or (C2-8)alkynyl;
        E1 is —C(R7)(R8)—; or —C(R7)(R8)—C(R9)(R10)—;
        E2 is —C(R11)(R12)—; or —C(R11)(R12)—C(R13)(R14)—;
        either
        each of R7 and R8 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R7 and R8, taken together, are oxo or —CH2—CH2—;
        either
        each of R9 and R10 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R9 and R10, taken together, are oxo or —CH2—CH2—;
        either
        each of R11 and R12 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R11 and R12, taken together, are oxo or —CH2—CH2—; and
        either
        each of R13 and R14 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R13 and R14, taken together, are oxo or —CH2—CH2—,

in free form or in salt form.

    
    


In a third aspect, the invention relates to a compound of the formula




in which

    
    
        R1 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        R2 is a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G1, which group G1 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;
        R3 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        either
        R4 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl; and
        R5 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;
        or
        R4 and R5, taken together, are —C(H)═C(H)—C(H)═C(H)— or a (C1-8)alkylene group, in which (C1-8)alkylene group 1 or 2 —CH2— ring members are optionally replaced with hetero ring members independently selected from the group, consisting of —N(H)—, —N[(C1-8)alkyl]-, —O—, —S—, —S(═O)— or —S(═O)2—;
        R6 is hydrogen; (C1-8)alkyl; halogen-(C1-8)alkyl; hydroxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkyl; mercapto-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkyl; amino-(C1-8)alkyl; N—(C1-8)alkylamino-(C1-8)alkyl; N,N-di-[(C1-8)alkyl]amino-(C1-8)alkyl with two identical or different (C1-8)alkyl moieties in the N,N-di-[(C1-8)alkyl]amino moiety; (C2-8)alkenyl; or (C2-8)alkynyl;
        E1 is —C(R7)(R8)—; or —C(R7)(R8)—C(R9)(R10)—;
        E2 is —C(R11)(R12)—; or —C(R11)(R12)—C(R13)(R14)—;
        either
        each of R7 and R8 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R7 and R8, taken together, are oxo or —CH2—CH2—;
        either
        each of R9 and R10 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R9 and R10, taken together, are oxo or —CH2—CH2—;
        either
        each of R11 and R12 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R11 and R12, taken together, are oxo or —CH2—CH2—; and
        either
        each of R13 and R14 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;
        or
        R13 and R14, taken together, are oxo or —CH2—CH2—,

in free form or in salt form.

    
    


Halogen denotes fluorine, chlorine, bromine or iodine.
A halogenated group or moiety, such as halogenalkyl, can be mono-, poly- or per-halogenated.
An aryl group, ring or moiety is a naphthyl or, preferably, phenyl group, ring or moiety.
A heteroaryl group, ring or moiety is a monocyclic aromatic 5- or 6-membered structure, in which structure 1, 2, 3 or 4 ring members are hetero ring members independently selected from the group, consisting of a nitrogen ring member, an oxygen ring member and a sulfur ring member, such as furyl, pyrrolyl, thienyl, pyrazolyl, imidazolyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, triazolyl, tetrazolyl, pyrazinyl, pyridazinyl, pyrimidyl or pyridyl; or a bicyclic aromatic 9- or 10- or membered structure, in which structure 1, 2, 3, 4 or 5 ring members are hetero ring members independently selected from the group, consisting of a nitrogen ring member, an oxygen ring member and a sulfur ring member. The fused rings completing the bicyclic groups may contain only carbon atoms and may be saturated, partially saturated, or unsaturated. Heteroaryl groups which are bicyclic include at least one fully aromatic ring but the other fused ring may be aromatic; or non-aromatic. Examples of bicyclic heteroaryl groups include, benzofuranyl, benzothiophenyl, imidazopyridinyl, indazolyl, indolyl, isoquinolinyl, pyrazolopyridinyl and quinolinyl. The heteroaryl radical may be bonded via a carbon atom or heteroatom.
In one embodiment, the heteroaryl group is an aromatic 5- or 6-membered structure, in which structure 1, 2, 3 or 4 ring members are hetero ring members independently selected from the group, consisting of a nitrogen ring member, an oxygen ring member and a sulfur ring member.
A non-aromatic heterocyclyl group, ring or moiety is a non-aromatic 4-, 5-, 6- or 7-membered cyclic structure, in which cyclic structure 1, 2 or 3 ring members are hetero ring members independently selected from the group, consisting of a nitrogen ring member, an oxygen ring member and a sulfur ring member, such as azetidinyl, oxetanyl, pyrrolinyl, pyrrolidyl, tetrahydrofuryl, tetrahydrothienyl, piperidyl, piperazinyl, tetrahydropyranyl, morpholinyl or perhydroazepinyl.
Any non-cyclic carbon containing group or moiety with more than 1 carbon atom is straight-chain or branched.
Unless defined otherwise, carbon containing groups, moieties or molecules contain 1 to 8, 1 to 6, 1 to 4 or 1 or 2 carbon atoms.
The terms “alkoxy”, “alkenoxy” and “alkynoxy” respectively denote alkyl, alkenyl and alkynyl groups when linked by oxygen.
On account of one or more than one asymmetrical carbon atom, which may be present in a compound of the formula I, a corresponding compound of the formula I may exist in pure optically active form or in the form of a mixture of optical isomers, e.g. in the form of a racemic mixture. All of such pure optical isomers and all of their mixtures, including the racemic mixtures, are part of the present invention.
In one embodiment, the invention therefore relates to a compound of the formula




in which

    
    
        X, E1, E2, R1, R2, R3, R4, R5 and R6 are as defined hereinbefore in relation to the formula I,

in free form or in salt form.

    
    


In one embodiment, the invention therefore relates to a compound of the formula




in which

    
    
        X, E1, E2, R1, R2, R3, R4, R5 and R6 are as defined hereinbefore in relation to the formula I,

in free form or in salt form.

    
    


As used herein, the term “isomers” refers to different compounds that have the same molecular formula but differ in arrangement and configuration of the atoms. Also as used herein, the term “an optical isomer” or “a stereoisomer” refers to any of the various stereo isomeric configurations which may exist for a given compound of the present invention and includes geometric isomers. It is understood that a substituent may be attached at a chiral center of a carbon atom. Therefore, the invention includes enantiomers, diastereomers or racemates of the compound. “Enantiomers” are a pair of stereoisomers that are non-superimposable mirror images of each other. A 1:1 mixture of a pair of enantiomers is a “racemic” mixture. The term is used to designate a racemic mixture where appropriate. “Diastereoisomers” are stereoisomers that have at least two asymmetric atoms, but which are not mirror-images of each other. The absolute stereochemistry is specified according to the Cahn-Ingold-Prelog R-S system. When a compound is a pure enantiomer the stereochemistry at each chiral carbon may be specified by either R or S. Resolved compounds whose absolute configuration is unknown can be designated (+) or (−) depending on the direction (dextro- or levorotatory) which they rotate plane polarized light at the wavelength of the sodium D line. Certain of the compounds described herein contain one or more asymmetric centers or axes and may thus give rise to enantiomers, diastereomers, and other stereoisomeric forms that may be defined, in terms of absolute stereochemistry, as (R)- or (S)-. The present invention is meant to include all such possible isomers, including racemic mixtures, optically pure forms and intermediate mixtures. Optically active (R)- and (S)-isomers may be prepared using chiral synthons or chiral reagents, or resolved using conventional techniques. If the compound contains a double bond, the substituent may be E or Z configuration. If the compound contains a disubstituted cycloalkyl, the cycloalkyl substituent may have a cis- or trans-configuration.
A compound of the formula I may exist in tautomeric form. All such tautomers are part of the present invention.
A compound of the formula I may exist in free form or in salt form, for example a basic compound in acid addition salt form or an acidic compound in the form of a salt with a base. All of such free compounds and salts are part of the present invention.
In one embodiment, the invention relates to a compound of the formula I, Ia, Ib, Ic or Id as defined herein, in free form. In another embodiment, the invention relates to a compound of the formula I, Ia, Ib, Ic or Id, as defined herein, in salt form. In a further embodiment, the invention relates to a compound of the formula I, Ia, Ib, Ic or Id, as defined herein, in pharmaceutically acceptable salt form. In yet a further embodiment, the invention relates to a compound of the formula I, Ia, Ib, Ic or Id, as defined herein, in hydrochloride salt form. In yet a further embodiment, the invention relates to any one of the compounds of the Examples in free form. In yet a further embodiment, the invention relates to any one of the compounds of the Examples in pharmaceutically acceptable salt form. In yet a further embodiment, the invention relates to any one of the compounds of the Examples in hydrochloride salt form.
In yet a further embodiment, the invention relates to 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in free form. In yet a further embodiment, the invention relates to 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide in pharmaceutically acceptable salt form. In yet a further embodiment, the invention relates to 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in hydrochloride salt form.
In yet a further embodiment, the invention relates to 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in free form. In yet a further embodiment, the invention relates to 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in pharmaceutically acceptable salt form. In yet a further embodiment, the invention relates to 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide in hydrochloride salt form.
In yet a further embodiment, the invention relates to 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in free form. In yet a further embodiment, the invention relates to 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in pharmaceutically acceptable salt form. In yet a further embodiment, the invention relates to 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in hydrochloride salt form. In yet a further embodiment, the invention relates 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride hydrate.
As used herein, the terms “salt” or “salts” refers to an acid addition or base addition salt of a compound of the invention. “Salts” include in particular “pharmaceutical acceptable salts”. The term “pharmaceutically acceptable salts” refers to salts that retain the biological effectiveness and properties of the compounds of this invention and, which typically are not biologically or otherwise undesirable. In many cases, the compounds of the present invention are capable of forming acid and/or base salts by virtue of the presence of amino and/or carboxyl groups or groups similar thereto.
Pharmaceutically acceptable acid addition salts can be formed with inorganic acids and organic acids, e.g., acetate, aspartate, benzoate, besylate, bromide/hydrobromide, bicarbonate/carbonate, bisulfate/sulfate, camphorsulformate, chloride/hydrochloride, chlortheophyllonate, citrate, ethandisulfonate, fumarate, gluceptate, gluconate, glucuronate, hippurate, hydroiodide/iodide, isethionate, lactate, lactobionate, laurylsulfate, malate, maleate, malonate, mandelate, mesylate, methylsulphate, naphthoate, napsylate, nicotinate, nitrate, octadecanoate, oleate, oxalate, palmitate, pamoate, phosphate/hydrogen phosphate/dihydrogen phosphate, polygalacturonate, propionate, stearate, succinate, sulfosalicylate, tartrate, tosylate and trifluoroacetate salts. Inorganic acids from which salts can be derived include, for example, hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid and phosphoric acid. Organic acids from which salts can be derived include, for example, acetic acid, propionic acid, glycolic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, toluenesulfonic acid and sulfosalicylic acid. Pharmaceutically acceptable base addition salts can be formed with inorganic and organic bases. Inorganic bases from which salts can be derived include, for example, ammonium salts and metals from columns I to XII of the periodic table. In certain embodiments, the salts are derived from sodium, potassium, ammonium, calcium, magnesium, iron, silver, zinc, and copper; particularly suitable salts include ammonium, potassium, sodium, calcium and magnesium salts.
Organic bases from which salts can be derived include, for example, primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines and basic ion exchange resins. Certain organic amines include isopropylamine, benzathine, cholinate, diethanolamine, diethylamine, lysine, meglumine, piperazine and tromethamine.
The pharmaceutically acceptable salts of the present invention can be synthesized from a parent compound, a basic or acidic moiety, by conventional chemical methods. Generally, such salts can be prepared by reacting free acid forms of these compounds with a stoichiometric amount of the appropriate base (such as Na, Ca, Mg, or K hydroxide, carbonate, bicarbonate or the like), or by reacting free base forms of these compounds with a stoichiometric amount of the appropriate acid. Such reactions are typically carried out in water or in an organic solvent, or in a mixture of the two. Generally, use of non-aqueous media like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile is desirable, where practicable. Lists of additional suitable salts can be found, e.g., in “Remington's Pharmaceutical Sciences”, 20th ed., Mack Publishing Company, Easton, Pa., (1985); and in “Handbook of Pharmaceutical Salts: Properties, Selection, and Use” by Stahl and Wermuth (Wiley-VCH, Weinheim, Germany, 2002).
When both a basic group and an acid group are present in the same molecule, the compounds of the present invention may also form internal salts, e.g., zwitterionic molecules. The present invention also provides pro-drugs of the compounds of the present invention that convert in vivo to the compounds of the present invention. A pro-drug is an active or inactive compound that is modified chemically through in vivo physiological action, such as hydrolysis, metabolism and the like, into a compound of this invention following administration of the prodrug to a subject. The suitability and techniques involved in making and using pro-drugs are well known by those skilled in the art. Prodrugs can be conceptually divided into two non-exclusive categories, bioprecursor prodrugs and carrier prodrugs. See The Practice of Medicinal Chemistry, Ch. 31-32 (Ed. Wermuth, Academic Press, San Diego, Calif., 2001). Generally, bioprecursor prodrugs are compounds, which are inactive or have low activity compared to the corresponding active drug compound, that contain one or more protective groups and are converted to an active form by metabolism or solvolysis. Both the active drug form and any released metabolic products should have acceptably low toxicity.
Carrier prodrugs are drug compounds that contain a transport moiety, e.g., that improve uptake and/or localized delivery to a site(s) of action. Desirably for such a carrier prodrug, the linkage between the drug moiety and the transport moiety is a covalent bond, the prodrug is inactive or less active than the drug compound, and any released transport moiety is acceptably non-toxic. For prodrugs where the transport moiety is intended to enhance uptake, typically the release of the transport moiety should be rapid. In other cases, it is desirable to utilize a moiety that provides slow release, e.g., certain polymers or other moieties, such as cyclodextrins. Carrier prodrugs can, for example, be used to improve one or more of the following properties: increased lipophilicity, increased duration of pharmacological effects, increased site-specificity, decreased toxicity and adverse reactions, and/or improvement in drug formulation (e.g., stability, water solubility, suppression of an undesirable organoleptic or physiochemical property). For example, lipophilicity can be increased by esterification of (a) hydroxyl groups with lipophilic carboxylic acids (e.g., a carboxylic acid having at least one lipophilic moiety), or (b) carboxylic acid groups with lipophilic alcohols (e.g., an alcohol having at least one lipophilic moiety, for example aliphatic alcohols).
Exemplary prodrugs are, e.g., esters of free carboxylic acids and S-acyl derivatives of thiols and O-acyl derivatives of alcohols or phenols, wherein acyl has a meaning as defined herein. Suitable prodrugs are often pharmaceutically acceptable ester derivatives convertible by solvolysis under physiological conditions to the parent carboxylic acid, e.g., lower alkyl esters, cycloalkyl esters, lower alkenyl esters, benzyl esters, mono- or di-substituted lower alkyl esters, such as the ω-(amino, mono- or di-lower alkylamino, carboxy, lower alkoxycarbonyl)-lower alkyl esters, the α-(lower alkanoyloxy, lower alkoxycarbonyl or di-lower alkylaminocarbonyl)-lower alkyl esters, such as the pivaloyloxymethyl ester and the like conventionally used in the art. In addition, amines have been masked as arylcarbonyloxymethyl substituted derivatives which are cleaved by esterases in vivo releasing the free drug and formaldehyde (Bundgaard, J. Med. Chem. 2503 (1989)). Moreover, drugs containing an acidic NH group, such as imidazole, imide, indole and the like, have been masked with N-acyloxymethyl groups (Bundgaard, Design of Prodrugs, Elsevier (1985)). Hydroxy groups have been masked as esters and ethers. EP 039,051 (Sloan and Little) discloses Mannich-base hydroxamic acid prodrugs, their preparation and use.
Furthermore, the compounds of the present invention, including their salts, can also be obtained in the form of their hydrates, or include other solvents used for their crystallization. The compounds of the present invention may inherently or by design form solvates with pharmaceutically acceptable solvents (including water); therefore, it is intended that the invention embrace both solvated and unsolvated forms. The term “solvate” refers to a molecular complex of a compound of the present invention (including pharmaceutically acceptable salts thereof) with one or more solvent molecules. Such solvent molecules are those commonly used in the pharmaceutical art, which are known to be innocuous to the recipient, e.g., water, ethanol, and the like. The term “hydrate” refers to the complex where the solvent molecule is water.
The compounds of the present invention, including salts, hydrates and solvates thereof, may inherently or by design form polymorphs. In one embodiment, the invention therefore relates to a compound of the formula I, Ia, Ib, Ic, Id, or Ie as defined herein, or a pharmaceutically acceptable salt thereof, in crystalline form.
The present invention includes all pharmaceutically acceptable isotope-labeled compounds of the formula I, wherein one or more than one atom is/are replaced by one or more than one atom having the same atomic number as, but an atomic mass different from, the one(s) usually found in nature. Examples of such isotopes are those of carbon, such as 11C, 13C or 14C, chlorine, such as 36Cl, fluorine, such as 18F, bromine, such as 76Br, hydrogen, such as 2H or 3H, iodine, such as 123I, 124I, 125I or 131I, nitrogen, such as 13N or 15N, oxygen, such as 15O, 17O or 18O, phosphorus, such as 32P, or sulphur, such as 35S. An isotope-labeled compound of the formula I can be prepared by a process analogous to those described in the Examples or by a conventional technique known to those skilled in the art using an appropriate isotopically-labeled reagent or starting material. The incorporation of a heavier isotope, such as 2H (D), may provide greater metabolic stability to a compound of the formula I, which may result in, for example, an increased in vivo-half-life of the compound or in reduced dosage requirements. Certain isotope-labeled compounds of the formula I, for example those incorporating a radioactive isotope, such as 3H or 14C, may be used in drug or substrate-tissue distribution studies. Compounds of the formula I with a positron emitting isotope, such as 11C, 18F, 13N or 15O, may be useful in positron emission tomography (PET) or single photon emission computed tomography (SPECT) studies, e.g. to examine substrate-receptor occupancies.
Pharmaceutically acceptable solvates in accordance with the invention include those wherein the solvent of crystallization may be isotopically substituted, e.g. D2O, d6-acetone, d6-DMSO.
Compounds of the invention, i.e. compounds of formula (I) that contain groups capable of acting as donors and/or acceptors for hydrogen bonds may be capable of forming co-crystals with suitable co-crystal formers. These co-crystals may be prepared from compounds of formula (I) by known co-crystal forming procedures. Such procedures include grinding, heating, co-subliming, co-melting, or contacting in solution compounds of formula (I) with the co-crystal former under crystallization conditions and isolating co-crystals thereby formed. Suitable co-crystal formers include those described in WO 2004/078163. Hence the invention further provides co-crystals comprising a compound of formula (I).
In certain embodiments, the invention relates to a compound of the formula I, Ia, Ib, Ic or Id in free form or in salt form, in which:
(1) R1 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;

(2) R1 is hydrogen;

(3) R2 is an aryl, heteroaryl or non-aromatic heterocyclyl group G1, which group G1 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy, (C2-8)alkynoxy and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;

(4) R2 is an aryl, heteroaryl or non-aromatic heterocyclyl group G1, which group G1 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy, (C2-8)alkynoxy and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;

(5) R2 is an aryl or heteroaryl group G1, which group G1 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy, (C2-8)alkynoxy and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;

(6) R2 is a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G1, which group G1 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;

(7) R2 is a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G1, which group G1 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;

(8) R2 is a (C3-8)cycloalkyl, aryl or heteroaryl group G1, which group G1 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl and a (C3-8)cycloalkyl, aryl or heteroaryl group G2, which group G2 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;

(9) R2 is a heteroaryl group G1, which group G1 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl and a (C3-8)cycloalkyl, aryl or heteroaryl group G2, which group G2 is optionally substituted by 1 to 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;

(10) R2 is a heteroaryl group G1, which group G1 is optionally substituted by 1 or 2 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl and a (C3-8)cycloalkyl, aryl or heteroaryl group G2, which group G2 is unsubstituted;

(11) R2 is a heteroaryl or aryl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;

(12) R2 is a heteroaryl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;

(13) R2 is a heteroaryl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of deuterium, cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, deuterated (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;

(14) R2 is a heteroaryl group which contains 1, 2 or 3 nitrogen atom ring members and is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of deuterium, cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, deuterated (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;

(15) R2 is a monocyclic 6-membered heteroaryl group which contains 1, 2 or 3 nitrogen atom ring members and which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;

(16) R2 is a 6-membered heteroaryl group which contains 1, 2 or 3 nitrogen atom ring members and which is substituted by 1, 2, 3 or 4 substituents and wherein one of the substituents is located at the para position of the heteroaryl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;

(17) R2 is a 6-membered heteroaryl group which contains 1, 2 or 3 nitrogen atom ring members and which is substituted by 1, 2, 3 or 4 substituents and wherein one of the substituents is located at the para position of the heteroaryl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-8)alkynoxy;

(18) R2 is a 6-membered heteroaryl group which contains 1, 2 or 3 nitrogen atom ring members and which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-8)alkynoxy;

(19) R2 is a pyridyl or pyrazinyl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy, (C2-8)alkynoxy and a (C3-8)cycloalkyl, aryl, heteroaryl or non-aromatic heterocyclyl group G2, which group G2 is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, aminocarbonyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl and (C2-8)alkynyl;

(20) R2 is a pyridyl or pyrazinyl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy, (C2-8)alkynoxy and a (C3-8)cycloalkyl, aryl or heteroaryl group G2, which group G2 is unsubstituted;

(21) R2 is a pyridyl or pyrazinyl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;

(22) R2 is a pyridyl or pyrazinyl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-8)alkynoxy;

(23) R2 is a pyridyl or pyrazinyl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of deuterium, cyano, halogen, (C1-6)alkyl, deuterated (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-8)alkynoxy;

(24) R2 is a pyridyl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-8)alkynoxy;

(25) R2 is a pyrazinyl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-8)alkynoxy;

(26) R2 is a pyridyl or pyrazinyl group which is substituted by 1, 2, 3 or 4 substituents and wherein one of the substituents is located at the para position of the pyridyl or pyrazinyl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;

(27) R2 is a pyridyl or pyrazinyl group which is substituted by 1, 2, 3 or 4 substituents and wherein one of the substituents is located at the para position of the pyridyl or pyrazinyl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of deuterium, cyano, halogen, (C1-6)alkyl, deuterated (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-6)alkynoxy;

(28) R2 is a pyridyl or pyrazinyl group which is substituted by 1, 2, 3 or 4 substituents and wherein one of the substituents is located at the para position of the pyridyl or pyrazinyl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-6)alkynoxy;

(29) R2 is a pyridyl or pyrazinyl group which is substituted by 2, 3 or 4 substituents and wherein one of the substituents is located at the para position and one of the substituents is located at the ortho position of the pyridyl or pyrazinyl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-6)alkynoxy;

(30) R2 is a pyridyl or pyrazinyl group which is substituted by 2 substituents and wherein one of the substituents is located at the para position and one of the substituents is located at the ortho position of the pyridyl or pyrazinyl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-6)alkynoxy;

(31) R2 is a pyridyl or pyrazinyl group which is substituted by 2 substituents and wherein one of the substituents is located at the para position and one of the substituents is located at the ortho position of the pyridyl or pyrazinyl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of deuterium, cyano, chloro, bromo, (C1-6)alkyl, deuterated (C1-6)alkyl, (C1-6)alkoxy, (C1-3)alkoxy-(C1-3)alkoxy, trifluoromethyl and (C2-4)alkynoxy;

(32) R2 is a pyridyl or pyrazinyl group which is substituted by 2 substituents and wherein one of the substituents is located at the para position and one of the substituents is located at the ortho position of the pyridyl or pyrazinyl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of cyano, chloro, bromo, (C1-6)alkyl, (C1-6)alkoxy, (C1-3)alkoxy-(C1-3)alkoxy, trifluoromethyl and (C2-4)alkynoxy;

(33) R3 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;

(34) R3 is hydrogen;

(35) either

R4 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl; and

R5 is hydrogen; cyano; halogen; (C1-8)alkyl; halogen-(C1-8)alkyl; (C1-8)alkoxy; halogen-(C1-8)alkoxy; (C1-8)alkylthio; halogen-(C1-8)alkylthio; (C1-8)alkoxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkoxy; (C1-8)alkoxy-(C1-8)alkylthio; (C1-8)alkylthio-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkoxy; (C1-8)alkylthio-(C1-8)alkylthio; (C2-8)alkenyl; or (C2-8)alkynyl;

or

R4 and R5, taken together, are —C(H)═C(H)—C(H)═C(H)— or a (C1-8)alkylene group, in which (C1-8)alkylene group 1 or 2 —CH2— ring members are optionally replaced with hetero ring members independently selected from the group, consisting of —N(H)—, —N[(C1-8)alkyl]-, —O—, —S—, —S(═O)— or —S(═O)2—;

(36) R4 is hydrogen; or halogen; and

R5 is hydrogen; or halogen;

(37) R4 is hydrogen; and

R5 is halogen;

(38) R4 is halogen; and

R5 is hydrogen;

(39) each of R4 and R5 is hydrogen;

(40) R4 is hydrogen; and

R5 is fluoro or chloro;

(41) R6 is hydrogen; (C1-8)alkyl; halogen-(C1-8)alkyl; hydroxy-(C1-8)alkyl; (C1-8)alkoxy-(C1-8)alkyl; mercapto-(C1-8)alkyl; (C1-8)alkylthio-(C1-8)alkyl; amino-(C1-8)alkyl; N—(C1-8)alkylamino-(C1-8)alkyl; N,N-di-[(C1-8)alkyl]amino-(C1-8)alkyl with two identical or different (C1-8)alkyl moieties in the N,N-di-[(C1-8)alkyl]amino moiety; (C2-8)alkenyl; or (C2-8)alkynyl;

(42) R6 is (C1-8)alkyl; or halogen-(C1-8)alkyl;

(43) R6 is (C1-3)alkyl; or halogen-(C1-3)alkyl;

(44) R6 is (C1-8)alkyl; or fluorine-substituted (C1-8)alkyl;

(45) R6 is (C1-3)alkyl; or fluorine-substituted (C1-3)alkyl;

(46) R6 is methyl, fluoromethyl or di-fluoromethyl;

(47) R6 is di-fluoromethyl;

(48) E1 is —C(R7)(R8)—; or —C(R7)(R8)—C(R9)(R10)—;

(49) E1 is —C(R7)(R8)—;

(50) E2 is —C(R11)(R12)—; or —C(R11)(R12)—C(R13)(R14)—;

(51) E2 is —C(R11)(R12)—;

(52) either

each of R7 and R8 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;

or

R7 and R8, taken together, are oxo or —CH2—CH2—;

(53) each of R7 and R8 is independently selected from hydrogen and fluoro;

(54) each of R7 and R8 is hydrogen;

(55) either

each of R9 and R10 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;

or

R9 and R10, taken together, are oxo or —CH2—CH2—;

(56) each of R9 and R10 is hydrogen;

(57) either

each of R11 and R12 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;

or

R11 and R12, taken together, are oxo or —CH2—CH2—;

(58) each of R11 and R12 is independently selected from the group, consisting of hydrogen, halogen, (C1-8)alkyl and halogen-(C1-8)alkyl;

(59) each of R11 and R12 is independently selected from the group, consisting of hydrogen, (C1-8)alkyl and halogen-(C1-8)alkyl;

(60) R11 is (C1-8)alkyl, and R12 is halogen-(C1-8)alkyl;

(61) each of R11 and R12 is independently selected from the group, consisting of hydrogen, (C1-3)alkyl and halogen-(C1-3)alkyl;

(62) each of R11 and R12 is independently selected from the group, consisting of hydrogen, methyl, fluoromethyl, difluoromethyl and trifluoromethyl;

(63) each of R11 and R12 is independently selected from the group, consisting of hydrogen, methyl and trifluoromethyl;

(64) each of R11 and R12 is hydrogen;

(65) either

each of R13 and R14 is independently selected from the group, consisting of hydrogen, cyano, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkyl and (C1-8)alkylthio-(C1-8)alkyl;

or

R13 and R14, taken together, are oxo or —CH2—CH2—.

(66) X is O;

(67) X is S.

The skilled person would understand that the embodiments (1) to (67) may be used independently, collectively or in any combination or sub-combination to the limit the scope of the invention as described hereinbefore in relation to compounds of the formula I, Ia, Ib, Ic or Id.
In one embodiment, the invention relates to a compound of the formula




in which

    
    
        R2 is a heteroaryl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;
        R4 is hydrogen; or halogen;
        R5 is hydrogen; or halogen;
        R6 is (C1-8)alkyl; or halogen-(C1-8)alkyl; and
        each of R11 and R12 is independently selected from the group, consisting of hydrogen, methyl, fluoromethyl, difluoromethyl and trifluoromethyl;

in free form or in salt form.

    
    


In another embodiment, the invention relates to a compound of the formula




in which

    
    
        R2 is a pyridyl or pyrazinyl group which is optionally substituted by 1, 2, 3 or 4 substituents independently selected from the group, consisting of cyano, nitro, amino, aminocarbonyl, amino-(C1-8)alkyl, (C1-4)alkyl-amino-(C1-8)alkyl, di(C1-4)alkyl-amino-(C1-8)alkyl, halogen, (C1-8)alkyl, halogen-(C1-8)alkyl, hydroxy, oxo, (C1-8)alkoxy, halogen-(C1-8)alkoxy, (C1-8)alkylthio, halogen-(C1-8)alkylthio, (C1-8)alkoxy-(C1-8)alkyl, (C1-8)alkoxy-(C1-8)alkoxy, (C1-8)alkoxy-(C1-8)alkylthio, (C1-8)alkylthio-(C1-8)alkyl, (C1-8)alkylthio-(C1-8)alkoxy, (C1-8)alkylthio-(C1-8)alkylthio, (C2-8)alkenyl, (C2-8)alkynyl, (C2-8)alkenoxy and (C2-8)alkynoxy;
        R4 is hydrogen; or halogen;
        R5 is hydrogen; or halogen;
        R6 is (C1-8)alkyl; or halogen-(C1-8)alkyl; and
        each of R11 and R12 is independently selected from the group, consisting of hydrogen, methyl, fluoromethyl, difluoromethyl and trifluoromethyl;

in free form or in salt form.

    
    


In yet another embodiment, the invention relates to a compound of the formula Id in which

    
    
        R2 is a pyridyl or pyrazinyl group which is substituted by 1, 2, 3 or 4 substituents and wherein one of the substituents is located at the para position of the pyridyl or pyrazinyl group relative to the amide linker and wherein the substituents are independently selected from the group, consisting of cyano, halogen (C1-6)alkyl, (C1-6)alkoxy, (C1-6)alkoxy-(C1-6)alkoxy, halogen-(C1-6)alkyl and (C2-6)alkynoxy;
        R4 is hydrogen; or halogen;
        R5 is hydrogen; or halogen;
        R6 is methyl, fluoromethyl or di-fluoromethyl; and
        each of R11 and R12 is independently selected from the group, consisting of hydrogen, methyl, fluoromethyl, difluoromethyl and trifluoromethyl;

in free form or in salt form.

    
    


In particular embodiments, the invention relates to one or more than one, e.g. all, of the compounds of the formula I mentioned in the Examples hereinafter, in free form or in salt form. In one embodiment, the invention relates to one of the compounds of the formula I mentioned in the Examples hereinafter, in free form. In another embodiment, the invention relates to one of the compounds of the formula I mentioned in the Examples hereinafter, in salt form. In a further embodiment, the invention relates to one of the compounds of the formula I mentioned in the Examples hereinafter, in pharmaceutically acceptable salt form. In yet a further embodiment, the invention relates to one of the compounds of the formula I mentioned in the Examples hereinafter, in hydrochloride salt form.
In another embodiment, the invention relates to a compound of the invention, or a pharmaceutically acceptable salt thereof, which is selected from:

    Furan-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2-Methyl-oxazole-4-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyrimidine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    Imidazo[1,2-a]pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    3-Fluoro-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2,5-Dimethyl-oxazole-4-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2-Methyl-thiazole-4-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    6-Hydroxy-pyridazine-3-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    Pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-(3-Trifluoromethyl-pyrazol-1-yl)-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-(3-Methyl-pyrazol-1-yl)-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]amide;
    3-Chloro-5-trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methoxy-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Hydroxy-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    4-Bromo-furan-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Trifluoromethyl-furan-3-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    N-[3-(5-Amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-4-bromo-benzamide;
    5-Methyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    N-[3-(5-Amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-nicotinamide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methoxy-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-chloro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    3-Chloro-5-trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Chloro-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Chloro-5-trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyrimidine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    2,5-Dimethyl-oxazole-4-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    2-Methyl-oxazole-4-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Pyridine-2,5-dicarboxylic acid 5-amide 2-{[3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide};
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methoxy-pyridine-2-carboxylic acid [3-(5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3,6-di-methyl-6-trifluoromethyl-3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methoxy-pyridine-2-carboxylic acid [3-(5-amino-3,6-di-methyl-6-trifluoromethyl-3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyrimidine-2-carboxylic acid [3-(5-amino-3,6-di-methyl-6-trifluoromethyl-3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyrimidine-2-carboxylic acid [3-(5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-pyrazine-2-carboxylic acid [3-(5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid[3-(5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid[3-(5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid[3-(5-amino-3-difluoromethyl-6,6-dimethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-6,6-dimethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-2,4-difluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-2,4-difluoro-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-2,4-difluoro-phenyl]-amide;
    5-Bromo-3-hydroxy-pyridine-2-carboxylic acid [5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-2,4-difluoro-phenyl]amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3,5-Dichloro-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-hydroxy-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid[3-(3-amino-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid[3-(3-amino-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(3-amino-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(3-amino-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    N-(3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-1,4-oxazepin-5-yl)-4-fluorophenyl)-5-chloropicolinamide;
    5-Bromo-pyridine-2-carboxylic acid [3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    4-Bromo-furan-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    6-Hydroxy-pyridazine-3-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2-Methyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2-Ethyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2,5-Dimethyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]amide;
    5-Bromo-3-hydroxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Difluoromethyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    3,5-Dichloro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3,5-Difluoro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-benzofuran-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-chloro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-hydroxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Ethoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyrimidine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Difluoromethyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2,2-Difluoro-ethoxy)-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2,2,2-Trifluoro-ethoxy)-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    4-Bromo-furan-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Pyrazolo[1,5-a]pyridine-2-carboxylic acid [3-(5-amino-3 difluoromethyl-3,6-dihydro-2H [1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    2-Methyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    2,5-Dimethyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Imidazo[1,2-a]pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    2-Ethyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Difluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1-Methyl-1H-imidazole-2 carboxylic acid [3-(5-amino-3 difluoromethyl-3,6-dihydro-2H [1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    6-Hydroxy-pyridazine-3-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Fluoro-ethoxy)-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Difluoromethoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Fluoromethoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-3-fluoro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-1H-pyrazole-3-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Hydroxy-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methoxy-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    2-Methyl-thiazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-thiazole-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1-Methyl-1H-pyrazole-3-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1-Methyl-4-nitro-1H-pyrazole-3-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    3-Amino-5-chloro-pyridine-2-carboxylic acid [3-(5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Chloro-5-trifluoromethyl-pyridine-2-carboxylic acid [3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [3-(3-amino-6,6 difluoro-5-methyl-2,5,6,7 tetrahydro-[1,4]oxazepin-5-yl)-4 fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(3-amino-6,6-difluoro-5 methyl-2,5,6,7-tetrahydro[1,4]oxazepin-5-yl)-4 fluoro-phenyl]-amide;
    7H-Pyrrolo[2,3-d]pyrimidine-6-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    3-Amino-5-(2-methoxy-ethoxy)-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    (5-Difluoromethyl-5-{5-[(5-ethyl-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester;
    3-Amino-5-chloro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Chloro-5-methoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    6-Oxo-1,6-dihydro-pyridine-3-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide; Pyrrolo[1,2-c]pyrimidine-3-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-But-2-ynyloxy-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Amino-5-bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1-Ethyl-1H-imidazole-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Prop-2-ynyloxy-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Amino-2-methyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-3-hydroxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Isopropoxy-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Ethoxy-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Dimethylaminomethyl-3-methyl-benzofuran-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1,5-Dimethyl-1H-[1,2,3]triazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methoxy-3-methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Amino-5-methoxy-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Difluoromethoxy-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Fluoromethoxy-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-3-methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3,5-Dimethoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    3-Fluoro-5-(2-methoxy-ethoxy)-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-But-2-ynyloxy-3-methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Chloro-5-methoxymethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Chloro-5-fluoromethoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide; and
    3-Chloro-5-difluoromethoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide.


In another embodiment, the invention relates to a compound of the invention, or a pharmaceutically acceptable salt thereof, which is selected from:

    Furan-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-((S)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2-Methyl-oxazole-4-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyrimidine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    Imidazo[1,2-a]pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    3-Fluoro-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2,5-Dimethyl-oxazole-4-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2-Methyl-thiazole-4-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    6-Hydroxy-pyridazine-3-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    Pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-(3-Trifluoromethyl-pyrazol-1-yl)-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-(3-Methyl-pyrazol-1-yl)-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    3-Chloro-5-trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methoxy-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Hydroxy-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    4-Bromo-furan-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Trifluoromethyl-furan-3-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    N-[3-(5-Amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-4-bromo-benzamide;
    5-Methyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    N-[3-(5-Amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-nicotinamide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-chloro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    3-Chloro-5-trifluoromethyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]amide;
    5-Chloro-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    3-Chloro-5-trifluoromethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Trifluoromethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyrimidine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Trifluoromethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    2,5-Dimethyl-oxazole-4-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]amide;
    2-Methyl-oxazole-4-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-pyrazine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Pyridine-2,5-dicarboxylic acid 5-amide 2-{[3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide};
    5-Bromo-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Methoxy-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-di-methyl-6-trifluoromethyl-3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Methoxy-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-di-methyl-6-trifluoromethyl-3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyrimidine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-di-methyl-6-trifluoromethyl-3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyrimidine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-pyrazine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Cyano-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    Cyano-pyridine-2-carboxylic acid [3-((3R,6S)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid[3-((3R,6R)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid[3-((3S,6R)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid[3-(5-amino-3-difluoromethyl-6,6-dimethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-6,6-dimethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Bromo-pyridine-2-carboxylic acid [5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-2,4-difluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-2,4-difluoro-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-2,4-difluoro-phenyl]-amide;
    5-Bromo-3-hydroxy-pyridine-2-carboxylic acid [5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-2,4-difluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3,5-Dichloro-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-hydroxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid[3-((S)-3-amino-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid[3-((S)-3-amino-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(3-amino-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]amide;
    5-Bromo-pyridine-2-carboxylic acid [3-(3-amino-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    N-(3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-1,4-oxazepin-5-yl)-4-fluorophenyl)-5-chloropicolinamide;
    5-Bromo-pyridine-2-carboxylic acid [3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    4-Bromo-furan-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    6-Hydroxy-pyridazine-3-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]amide;
    2-Methyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2-Ethyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    2,5-Dimethyl-oxazole-4-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Bromo-3-hydroxy-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    5-Difluoromethyl-pyrazine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide;
    3,5-Dichloro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3,5-Difluoro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methyl-benzofuran-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-chloro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-hydroxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Ethoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyrimidine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Difluoromethyl-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2,2-Difluoro-ethoxy)-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2,2,2-Trifluoro-ethoxy)-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    4-Bromo-furan-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide; Pyrazolo[1,5-a]pyridine-2-carboxylic acid [3-((R)-5-amino-3 difluoromethyl-3,6-dihydro-2H [1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    2-Methyl-oxazole-4-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    2,5-Dimethyl-oxazole-4-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Imidazo[1,2-a]pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    2-Ethyl-oxazole-4-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Difluoromethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1-Methyl-1H-imidazole-2 carboxylic acid [3-((R)-5-amino-3 difluoromethyl-3,6-dihydro-2H [1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    6-Hydroxy-pyridazine-3-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-(2-Methoxy-ethoxy)-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Fluoro-ethoxy)-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Difluoromethoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Fluoromethoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Chloro-3-fluoro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-1H-pyrazole-3-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Hydroxy-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methoxy-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Cyano-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    2-Methyl-thiazole-4-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methyl-thiazole-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1-Methyl-1H-pyrazole-3-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1-Methyl-4-nitro-1H-pyrazole-3-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Amino-5-chloro-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    3-Chloro-5-trifluoromethyl-pyridine-2-carboxylic acid [3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide;
    5-Bromo-3-methoxy-pyridine-2-carboxylic acid [3-(3-amino-6,6 difluoro-5-methyl-2,5,6,7 tetrahydro-[1,4]oxazepin-5-yl)-4 fluoro-phenyl]-amide;
    5-Cyano-pyridine-2-carboxylic acid [3-(3-amino-6,6-difluoro-5 methyl-2,5,6,7-tetrahydro[1,4]oxazepin-5-yl)-4 fluoro-phenyl]-amide;
    7H-Pyrrolo[2,3-d]pyrimidine-6-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Amino-5-(2-methoxy-ethoxy)-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    ((R)-5-Difluoromethyl-5-{5-[(5-ethyl-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester;
    3-Amino-5-chloro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Chloro-5-methoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    6-Oxo-1,6-dihydro-pyridine-3-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    Pyrrolo[1,2-c]pyrimidine-3-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-But-2-ynyloxy-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Amino-5-bromo-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1-Ethyl-1H-imidazole-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Prop-2-ynyloxy-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Amino-2-methyl-oxazole-4-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Chloro-3-hydroxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Isopropoxy-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Ethoxy-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Dimethylaminomethyl-3-methyl-benzofuran-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    1,5-Dimethyl-1H-[1,2,3]triazole-4-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Methoxy-3-methyl-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Amino-5-methoxy-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-Difluoromethoxy-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide;
    5-Fluoromethoxy-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-3-methyl-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3,5-Dimethoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Fluoro-5-(2-methoxy-ethoxy)-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    5-But-2-ynyloxy-3-methyl-pyrazine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Chloro-5-methoxymethyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide;
    3-Chloro-5-fluoromethoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide; and
    3-Chloro-5-difluoromethoxy-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide.


In one embodiment, the invention relates to 5-cyano-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide, or a pharmaceutically acceptable salt thereof. In another embodiment, the invention relates to 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide, or a pharmaceutically acceptable salt thereof. In yet another embodiment, the invention relates to 5-cyano-pyridine-2-carboxylic acid [3-((S)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide, or a pharmaceutically acceptable salt thereof.
In a more focused aspect, the invention relates to a crystalline form of 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide, or a pharmaceutically acceptable salt thereof. In another embodiment, the invention relates to a crystalline form of 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide which has an X-ray powder diffraction pattern with at least one, two or three peaks having angle of refraction 2 theta (θ) values selected from 8.3, 10.8, 16.6, 18.9, 21.5, 22.2, 23.3, 25.4 and 28.5 when measured using CuKα radiation, more particularly wherein said values may be plus or minus 0.2° 2θ. In a further embodiment, the invention relates to a crystalline form of 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide which has an X-ray powder diffraction pattern substantially the same as the X-ray powder diffraction pattern shown in FIG. 1 when measured using CuKα radiation. For details see Example 152.
In a more focused aspect, the invention relates to a crystalline form of 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide. In another embodiment, the invention relates to a crystalline form of 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide which has an X-ray powder diffraction pattern with at least one, two or three peaks having angle of refraction 2 theta (θ) values selected from 8.3, 9.0, 10.9, 12.9, 13.9, 15.4, 16.2, 17.1, 18.2, and 24.5° when measured using CuKα radiation, wherein said values are plus or minus 0.2° 2θ. In a further embodiment, the invention relates to a crystalline form of 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide which has an X-ray powder diffraction pattern substantially the same as the X-ray powder diffraction pattern shown in FIG. 2 when measured using CuKα radiation. For details see Example 72b. In yet a further embodiment, the invention relates to a crystalline form of 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in association with at least one pharmaceutically acceptable carrier or diluent.
In a more focused aspect, the invention relates to a crystalline form of 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide. In one embodiment, the invention relates to a crystalline form of 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide in association with at least one pharmaceutically acceptable carrier or diluent.
In a further aspect, the invention relates to a process for the preparation of a compound of the formula I, in free form or in salt form, comprising
a) the reaction of a compound of the formula




in which R1, R3, R4, R5, R6, E1 and E2 are as defined for the formula I, in free form or in salt form, with a compound of the formula





in which R2 is as defined for the formula I and L is a leaving group, in free form or in salt form,

b) the reaction of a compound of the formula





in which R1, R3, R4, R5, R6, E1 and E2 are as defined for the formula I, in free form or in salt form, with a compound of the formula





in which R2 is as defined for the formula I, in free form or in salt form,

c) the optional reduction, oxidation or other functionalisation of the resulting compound,

d) the cleavage of any protecting group(s) optionally present and

e) the recovery of the so obtainable compound of the formula I in free form or in salt form.

The reactions can be effected according to conventional methods, for example as described in the Examples.
The working-up of the reaction mixtures and the purification of the compounds thus obtainable may be carried out in accordance with known procedures.
Salts may be prepared from free compounds in known manner, and vice-versa.
Compounds of the formula I can also be prepared by further conventional processes, which processes are further aspects of the invention, e.g. as described in the Examples.
The starting materials of the formulae II and III are known, may be prepared according to conventional procedures starting from known compounds, may be prepared from known compounds as described in the Examples or may be prepared using procedures analogous to those described in the Examples.
Compounds of the formula I, in free form or in pharmaceutically acceptable salt form, hereinafter often referred to as “agents of the invention”, exhibit valuable pharmacological properties, when tested in vitro or in vivo, and are, therefore, useful in medicaments.
E.g., agents of the invention are inhibitors of aspartic proteases and can be used for the treatment or prevention of a condition, disease or disorder involving processing by such enzymes. Particularly, agents of the invention inhibit beta-secretase and, thus, the generation of beta-amyloid and the subsequent aggregation into oligomers and fibrils.
The inhibiting properties of an agent of the invention towards proteases can be evaluated in tests as described hereinafter.
Test 1: Inhibition of Human BACE-1
Recombinant BACE-1 (extracellular domain, expressed in baculovirus and purified using standard methods) at 0.1 to 10 nM concentrations is incubated with the test compound at various concentrations for 1 hour at room temperature in 10 to 100 mM acetate buffer, pH 4.5, containing 0.1% CHAPS. Synthetic fluorescence-quenched peptide substrate, derived from the sequence of APP and containing a suitable fluorophore-quencher pair, is added to a final concentration of 1 to 5 μM, and the increase in fluorescence is recorded at a suitable excitation/emission wavelength in a microplate spectro-fluorimeter for 5 to 30 minutes in 1-minute intervals. IC50 values are calculated from percentage of inhibition of BACE-1 activity as a function of the test compound concentration.
Test 2: Inhibition of Human BACE-2
Recombinant BACE-2 (extracellular domain, expressed in baculovirus and purified using standard methods) at 0.1 to 10 nM concentrations is incubated with the test compound at various concentrations for 1 hour at room temperature in 10 to 100 mM acetate buffer, pH 4.5, containing 0.1% CHAPS. Synthetic peptide substrate, derived from the sequence of APP and containing a suitable fluorophore-quencher pair, is added to a final concentration of 1 to 5 μM, and the increase in fluorescence is recorded at a suitable excitation/emission wavelength in a microplate spectro-fluorimeter for 5 to 30 minutes in 1-minute intervals. IC50 values are calculated from percentage of inhibition of BACE-2 activity as a function of the test compound concentration.
Test 3: Inhibition of Human Cathepsin D
Recombinant cathepsin D (expressed as procathepsin D in baculovirus, purified using standard methods and activated by incubation in sodium formate buffer pH 3.7) is incubated with the test compound at various concentrations for 1 hour at room temperature in sodium formate or sodium acetate buffer at a suitable pH within the range of pH 3.0 to 5.0. Synthetic peptide substrate Mca-Gly-Lys-Pro-Ile-Leu-Phe-Phe-Arg-Leu-Lys(DNP)-D-Arg-NH2 is added to a final concentration of 1 to 5 μM, and the increase in fluorescence is recorded at excitation of 325 nm and emission at 400 nm in a microplate spectro-fluorimeter for 5 to 30 minutes in 1-minute intervals. IC50 values are calculated from the percentage of inhibition of cathepsin D-activity as a function of the test compound concentration.
Test 4: Inhibition of Cellular Release of Amyloid Peptide 1-40
Chinese hamster ovary cells are transfected with the gene for amyloid precursor protein. The cells are plated at a density of 8000 cells/well into 96-well microtiter plates and cultivated for 24 hours in DMEM cell culture medium containing 10% FCS. The test compound is added to the cells at various concentrations, and the cells are cultivated for 24 hours in the presence of the test compound. The supernatants are collected, and the concentration of amyloid peptide 1-40 is determined using state of the art immunoassay techniques, for example sandwich ELISA, homogenous time-resolved fluorescence (HTRF) immunoassay, or electro-chemiluminescence immunoassay. The potency of the compound is calculated from the percentage of inhibition of amyloid peptide release as a function of the test compound concentration.
Agents of the invention were tested in at least one of the above-described tests. Specific activities of agents of the invention are described in Example 187.
As used herein, the term “pharmaceutically acceptable carrier” includes any and all solvents, dispersion media, coatings, surfactants, antioxidants, preservatives (e.g., antibacterial agents, antifungal agents), isotonic agents, absorption delaying agents, salts, preservatives, drugs, drug stabilizers, binders, excipients, disintegration agents, lubricants, sweetening agents, flavoring agents, dyes, and the like and combinations thereof, as would be known to those skilled in the art (see, for example, Remington's Pharmaceutical Sciences, 18th Ed. Mack Printing Company, 1990, pp. 1289-1329). Except insofar as any conventional carrier is incompatible with the active ingredient, its use in the therapeutic or pharmaceutical compositions is contemplated.
The term “a therapeutically effective amount” of a compound of the present invention refers to an amount of the compound of the present invention that will elicit the biological or medical response of a subject, for example, reduction or inhibition of an enzyme or a protein activity, or ameliorate symptoms, alleviate conditions, slow or delay disease progression, or prevent a disease, etc. In one non-limiting embodiment, the term “a therapeutically effective amount” refers to the amount of the compound of the present invention that, when administered to a subject, is effective to (1) at least partially alleviating, inhibiting, preventing and/or ameliorating a condition, or a disorder or a disease (i) mediated by BACE-1 or (ii) associated with BACE-1 activity, or (iii) characterized by activity (normal or abnormal) of BACE-1; or (2) reducing or inhibiting the activity of BACE-1. In another non-limiting embodiment, the term “a therapeutically effective amount” refers to the amount of the compound of the present invention that, when administered to a cell, or a tissue, or a non-cellular biological material, or a medium, is effective to at least partially reduce or inhibit the activity of BACE-1. The meaning of the term “a therapeutically effective amount” as illustrated in the above embodiments for BACE-1 also applies by the same means to any other relevant proteins/peptides/enzymes, such as BACE-2, or cathepsin D.
As used herein, the term “subject” refers to an animal. Typically the animal is a mammal. A subject also refers to for example, primates (e.g., humans, male or female), cows, sheep, goats, horses, dogs, cats, rabbits, rats, mice, fish, birds and the like. In certain embodiments, the subject is a primate. In yet other embodiments, the subject is a human.
As used herein, the term “inhibit”, “inhibition” or “inhibiting” refers to the reduction or suppression of a given condition, symptom, or disorder, or disease, or a significant decrease in the baseline activity of a biological activity or process.
As used herein, the term “treat”, “treating” or “treatment” of any disease or disorder refers in one embodiment, to ameliorating the disease or disorder (i.e., slowing or arresting or reducing the development of the disease or at least one of the clinical symptoms thereof). In another embodiment “treat”, “treating” or “treatment” refers to alleviating or ameliorating at least one physical parameter including those which may not be discernible by the patient. In yet another embodiment, “treat”, “treating” or “treatment” refers to modulating the disease or disorder, either physically, (e.g., stabilization of a discernible symptom), physiologically, (e.g., stabilization of a physical parameter), or both. In yet another embodiment, “treat”, “treating” or “treatment” refers to preventing or delaying the onset or development or progression of the disease or disorder.
As used herein, a subject is “in need of” a treatment if such subject would benefit biologically, medically or in quality of life from such treatment.
As used herein, the term an “agent” of the invention is used interchangeably with the term a “compound” of the invention and has no difference in meaning therefrom.
As used herein, the term “a,” “an,” “the” and similar terms used in the context of the present invention (especially in the context of the claims) are to be construed to cover both the singular and plural unless otherwise indicated herein or clearly contradicted by the context. The use of any and all examples, or exemplary language (e.g. “such as”) provided herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed.
Due to their inhibiting properties towards proteases, agents of the invention may be useful in the treatment or prevention of a variety of disabilitating psychiatric, psychotic, neurological or vascular states, such as a condition, disease or disorder of the vascular system or of the nervous system, in which beta-amyloid generation or aggregation plays a role, or, based on the inhibition of BACE-2 (beta-site APP-cleaving enzyme 2) or cathepsin D, which are close homologues of the pepsin-type aspartyl proteases and beta-secretase, and the correlation of the BACE-2 or cathepsin D expression with a more tumorigenic or metastatic potential of tumor cells, as anti-cancer medicaments, such as in the suppression of the metastasis process associated with tumor cells. The said condition, disease or disorder of the vascular system or of the nervous system is exemplified by, and includes, without limitation, an anxiety disorder, such as panic disorder with or without agoraphobia, agoraphobia without history of panic disorder, an animal or other specific phobia, including a social phobia, social anxiety disorder, anxiety, obsessive-compulsive disorder, a stress disorder, including post-traumatic or acute stress disorder, or a generalized or substance-induced anxiety disorder; a neurosis; seizures; epilepsy, especially partial seizures, simple, complex or partial seizures evolving to secondarily generalized seizures or generalized seizures [absence (typical or atypical), myoclonic, clonic, tonic, tonic-clonic or atonic seizures]; convulsions; migraine; an affective disorder, including a depressive or bipolar disorder, e.g. single-episode or recurrent major depressive disorder, major depression, a dysthymic disorder, dysthymia, depressive disorder NOS, bipolar I or bipolar II manic disorder or cyclothymic disorder; a psychotic disorder, including schizophrenia or depression; neurodegeneration, e.g. neurodegeneration arising from cerebral ischemia; an acute, traumatic or chronic degenerative process of the nervous system, such as Parkinson's disease, Down's syndrome, dementia, e.g. senile dementia, dementia with Lewy bodies or a fronto-temporal dementia, a cognitive disorder, cognitive impairment, e.g. mild cognitive impairment, memory impairment, an amyloid neuropathy, a peripheral neuropathy, Alzheimer's disease, Gerstmann-Straeussler-Scheinker syndrome, Niemann-Pick disease, e.g. Niemann-Pick type C disease, brain inflammation, a brain, spinal cord or nerve injury, e.g. traumatic brain injury (TBI), a nerve trauma or a brain trauma, vascular amyloidosis, cerebral haemorrhage with amyloidosis, Huntington's chorea, amyotrophic lateral sclerosis, multiple sclerosis or fragile X syndrome; scrapie; cerebral amyloid angiopathy; an encephalopathy, e.g. transmissible spongiform encephalopathy; stroke; an attention disorder, e.g. attention deficit hyperactivity disorder; Tourette's syndrome; a speech disorder, including stuttering; a disorder of the circadian rhythm, e.g. in subjects suffering from the effects of jet lag or shift work; pain; nociception; itch; emesis, including acute, delayed or anticipatory emesis, such as emesis induced by chemotherapy or radiation, motion sickness, or post-operative nausea or vomiting; an eating disorder, including anorexia nervosa or bulimia nervosa; premenstrual syndrome; a muscle spasm or spasticity, e.g. in paraplegic patients; a hearing disorder, e.g. tinnitus or age-related hearing impairment; urinary incontinence; glaucoma; inclusion-body myositis; or a substance-related disorder, including substance abuse or dependency, including a substance, such as alcohol, withdrawal disorder. Agents of the invention may also be useful in enhancing cognition, e.g. in a subject suffering from a dementing condition, such as Alzheimer's disease; as pre-medication prior to anaesthesia or a minor medical intervention, such as endoscopy, including gastric endoscopy; or as ligands, e.g. radioligands or positron emission tomography (PET) ligands.
For the above-mentioned indications, the appropriate dosage will vary depending on, for example, the compound employed as active pharmaceutical ingredient, the host, the mode of administration, the nature and severity of the condition, disease or disorder or the effect desired. However, in general, satisfactory results in animals may be obtained at a daily dosage of from about 0.1 to about 100, preferably from about 1 to about 50, mg/kg of animal body weight. In larger mammals, for example humans, an indicated daily dosage is in the range of from about 0.5 to about 2000, preferably from about 10 to about 370, or from about 2 to about 200, mg of an agent of the invention conveniently administered, for example, in divided doses up to four times a day or in sustained release form. For the compound 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide, a predicted daily dosage is in the range of 10 to 370 mg (total dose per day for a 70 kg person).
An agent of the invention may be administered by any conventional route, in particular enterally, preferably orally, e.g. in the form of a tablet or capsule, or parenterally, e.g. in the form of an injectable solution or suspension.
In a further aspect, the invention relates to a pharmaceutical composition comprising an agent of the invention as active pharmaceutical ingredient in association with at least one pharmaceutically acceptable carrier or diluent and optionally in association with other auxiliary substances, such as inhibitors of cytochrome P450 enzymes, agents preventing the degradation of active pharmaceutical ingredients by cytochrome P450, agents improving or enhancing the pharmacokinetics of active pharmaceutical ingredients, agents improving or enhancing the bioavailability of active pharmaceutical ingredients, and so on, e.g. grapefruit juice, ketoconazole or, preferably, ritonavir. Such a composition may be manufactured in conventional manner, e.g. by mixing its components. Unit dosage forms contain, e.g., from about 0.1 to about 1000, preferably from about 1 to about 500, mg of an agent of the invention.
For example, for preclinical animal studies a compound of the invention, such as 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide, could be formulated as a suspension in a 0.5% methylcellulose solution with 0.1% Tween80.
In addition, the pharmaceutical compositions of the present invention can be made up in a solid form (including without limitation capsules, tablets, pills, granules, powders or suppositories), or in a liquid form (including without limitation solutions, suspensions or emulsions). The pharmaceutical compositions can be subjected to conventional pharmaceutical operations such as sterilization and/or can contain conventional inert diluents, lubricating agents, or buffering agents, as well as adjuvants, such as preservatives, stabilizers, wetting agents, emulsifers and buffers, etc.
Typically, the pharmaceutical compositions are tablets or gelatin capsules comprising the active ingredient together with

    
    
        a) diluents, e.g., lactose, dextrose, sucrose, mannitol, sorbitol, cellulose and/or glycine;
        b) lubricants, e.g., silica, talcum, stearic acid, its magnesium or calcium salt and/or polyethyleneglycol; for tablets also
        c) binders, e.g., magnesium aluminum silicate, starch paste, gelatin, tragacanth, methylcellulose, sodium carboxymethylcellulose and/or polyvinylpyrrolidone; if desired
        d) disintegrants, e.g., starches, agar, alginic acid or its sodium salt, or effervescent mixtures; and/or
        e) absorbents, colorants, flavors and sweeteners.
    
    


Tablets may be either film coated or enteric coated according to methods known in the art.
Suitable compositions for oral administration include an effective amount of a compound of the invention in the form of tablets, lozenges, aqueous or oily suspensions, dispersible powders or granules, emulsion, hard or soft capsules, or syrups or elixirs. Compositions intended for oral use are prepared according to any method known in the art for the manufacture of pharmaceutical compositions and such compositions can contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide pharmaceutically elegant and palatable preparations. Tablets may contain the active ingredient in admixture with nontoxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients are, for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, for example, corn starch, or alginic acid; binding agents, for example, starch, gelatin or acacia; and lubricating agents, for example magnesium stearate, stearic acid or talc. The tablets are uncoated or coated by known techniques to delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a time delay material such as glyceryl monostearate or glyceryl distearate can be employed. Formulations for oral use can be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water or an oil medium, for example, peanut oil, liquid paraffin or olive oil.
Certain injectable compositions are aqueous isotonic solutions or suspensions, and suppositories are advantageously prepared from fatty emulsions or suspensions. Said compositions may be sterilized and/or contain adjuvants, such as preserving, stabilizing, wetting or emulsifying agents, solution promoters, salts for regulating the osmotic pressure and/or buffers. In addition, they may also contain other therapeutically valuable substances. Said compositions are prepared according to conventional mixing, granulating or coating methods, respectively, and contain about 0.1-75%, or contain about 1-50%, of the active ingredient.
Suitable compositions for transdermal application include an effective amount of a compound of the invention with a suitable carrier. Carriers suitable for transdermal delivery include absorbable pharmacologically acceptable solvents to assist passage through the skin of the host. For example, transdermal devices are in the form of a bandage comprising a backing member, a reservoir containing the compound optionally with carriers, optionally a rate controlling barrier to deliver the compound of the skin of the host at a controlled and predetermined rate over a prolonged period of time, and means to secure the device to the skin.
Suitable compositions for topical application, e.g., to the skin and eyes, include aqueous solutions, suspensions, ointments, creams, gels or sprayable formulations, e.g., for delivery by aerosol or the like. Such topical delivery systems will in particular be appropriate for dermal application, e.g., for the treatment of skin cancer, e.g., for prophylactic use in sun creams, lotions, sprays and the like. They are thus particularly suited for use in topical, including cosmetic, formulations well-known in the art. Such may contain solubilizers, stabilizers, tonicity enhancing agents, buffers and preservatives.
As used herein a topical application may also pertain to an inhalation or to an intranasal application. They may be conveniently delivered in the form of a dry powder (either alone, as a mixture, for example a dry blend with lactose, or a mixed component particle, for example with phospholipids) from a dry powder inhaler or an aerosol spray presentation from a pressurised container, pump, spray, atomizer or nebuliser, with or without the use of a suitable propellant.
The present invention further provides anhydrous pharmaceutical compositions and dosage forms comprising the compounds of the present invention as active ingredients, since water may facilitate the degradation of certain compounds.
Anhydrous pharmaceutical compositions and dosage forms of the invention can be prepared using anhydrous or low moisture containing ingredients and low moisture or low humidity conditions. An anhydrous pharmaceutical composition may be prepared and stored such that its anhydrous nature is maintained. Accordingly, anhydrous compositions are packaged using materials known to prevent exposure to water such that they can be included in suitable formulary kits. Examples of suitable packaging include, but are not limited to, hermetically sealed foils, plastics, unit dose containers (a g., vials), blister packs, and strip packs.
The invention further provides pharmaceutical compositions and dosage forms that comprise one or more agents that reduce the rate by which the compound of the present invention as an active ingredient will decompose. Such agents, which are referred to herein as “stabilizers,” include, but are not limited to, antioxidants such as ascorbic acid, pH buffers, or salt buffers, etc.
In accordance with the foregoing, in a further aspect, the invention relates to an agent of the invention for use as a medicament, e.g. for the treatment or prevention of a neurological or vascular condition, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or for the suppression of the metastasis process associated with tumor cells. In a further embodiment, the invention relates to an agent of the invention for use in the treatment of a disease or disorder mediated by BACE-1, BACE-2 or cathepsin D activity. In one embodiment, the invention relates to an agent of the invention for use in the treatment of Alzheimer's Disease.
In a further aspect, the invention relates to the use of an agent of the invention as an active pharmaceutical ingredient in a medicament, e.g. for the treatment or prevention of a neurological or vascular condition, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or for the suppression of the metastasis process associated with tumor cells. In a further embodiment, the invention relates to the use of an agent of the invention as an active pharmaceutical ingredient in a medicament for the treatment or prevention of a disease or disorder mediated by BACE-1, BACE-2 or cathepsin D activity. In one embodiment, the invention relates to the use of an agent of the invention as an active pharmaceutical ingredient in a medicament for the treatment or prevention of Alzheimer's Disease.
In a further aspect, the invention relates to the use of an agent of the invention for the manufacture of a medicament for the treatment or prevention of a neurological or vascular condition, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or for the suppression of the metastasis process associated with tumor cells. In a further embodiment, the invention relates to the use of an agent of the invention for the manufacture of a medicament for the treatment or prevention of a disease or disorder mediated by BACE-1, BACE-2 or cathepsin D activity. In one embodiment, the invention relates to the use of an agent of the invention for the manufacture of a medicament for the treatment or prevention of Alzheimer's Disease.
In a further aspect, the invention relates to a method for the treatment or prevention of a neurological or vascular condition, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or for the suppression of the metastasis process associated with tumor cells, in a subject in need of such treatment, prevention or suppression, which method comprises administering to such subject an effective amount of an agent of the invention. In one embodiment, the invention relates to a method of modulating BACE-1, BACE-2 or cathepsin D activity in a subject, wherein the method comprises administering to the subject a therapeutically effective amount of an agent of the invention. In another embodiment, the invention relates to a method for the treatment or prevention of a disease mediated by BACE-1, BACE-2 or cathepsin D activity, in a subject in need of such treatment or prevention, which method comprises administering to such subject an effective amount of an agent of the invention. In yet another embodiment, the invention relates to a method for the treatment or prevention of Alzheimer's Disease, in a subject in need of such treatment or prevention, which method comprises administering to such subject an effective amount of an agent of the invention.
An agent of the invention can be administered as sole active pharmaceutical ingredient or as a combination with at least one other active pharmaceutical ingredient effective, e.g., in the treatment or prevention of a neurological or vascular condition, disease or disorder, in which beta-amyloid generation or aggregation plays a role, or in the suppression of the metastasis process associated with tumor cells. Such a pharmaceutical combination may be in the form of a unit dosage form, which unit dosage form comprises a predetermined quantity of each of the at least two active components in association with at least one pharmaceutically acceptable carrier or diluent. Alternatively, the pharmaceutical combination may be in the form of a package comprising the at least two active components separately, e.g. a pack or dispenser-device adapted for the concomitant or separate administration of the at least two active components, in which these active components are separately arranged. In a further aspect, the invention relates to such pharmaceutical combinations.
In a further aspect, the invention therefore relates to a pharmaceutical combination comprising a therapeutically effective amount of an agent of the invention and a second drug substance, for simultaneous or sequential administration.
In one embodiment, the invention provides a product comprising a compound of an agent of the invention and at least one other therapeutic agent as a combined preparation for simultaneous, separate or sequential use in therapy. In one embodiment, the therapy is the treatment of a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity.
In one embodiment, the invention provides a pharmaceutical composition comprising an agent of the invention and another therapeutic agent(s). Optionally, the pharmaceutical composition may comprise a pharmaceutically acceptable excipient, as described above.
In one embodiment, the invention provides a kit comprising two or more separate pharmaceutical compositions, at least one of which contains an agent of the invention. In one embodiment, the kit comprises means for separately retaining said compositions, such as a container, divided bottle, or divided foil packet. An example of such a kit is a blister pack, as typically used for the packaging of tablets, capsules and the like. The kit of the invention may be used for administering different dosage forms, for example, oral and parenteral, for administering the separate compositions at different dosage intervals, or for titrating the separate compositions against one another. To assist compliance, the kit of the invention typically comprises directions for administration.
In the combination therapies of the invention, the agent of the invention and the other therapeutic agent may be manufactured and/or formulated by the same or different manufacturers. Moreover, the compound of the invention and the other therapeutic may be brought together into a combination therapy: (i) prior to release of the combination product to physicians (e.g. in the case of a kit comprising the compound of the invention and the other therapeutic agent); (ii) by the physician themselves (or under the guidance of the physician) shortly before administration; (iii) in the patient themselves, e.g. during sequential administration of the compound of the invention and the other therapeutic agent. Accordingly, the invention provides an agent of the invention for use in the treatment of a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity, wherein the medicament is prepared for administration with another therapeutic agent. The invention also provides the use of another therapeutic agent for treating a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity, wherein the medicament is administered with an agent of the invention.
The invention also provides an agent of the invention for use in a method of treating a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity, wherein the agent of the invention is prepared for administration with another therapeutic agent. The invention also provides another therapeutic agent for use in a method of treating a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity, wherein the other therapeutic agent is prepared for administration with an agent of the invention. The invention also provides an agent of the invention for use in a method of treating a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity, wherein the agent of the invention is administered with another therapeutic agent. The invention also provides another therapeutic agent for use in a method of treating a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity, wherein the other therapeutic agent is administered with an agent of the invention.
The invention also provides the use of an agent of the invention for treating a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity, wherein the patient has previously (e.g. within 24 hours) been treated with another therapeutic agent. The invention also provides the use of another therapeutic agent for treating a disease or condition mediated by BACE-1, BACE-2 or cathepsin D activity, wherein the patient has previously (e.g. within 24 hours) been treated with an agent of the invention.
In one embodiment, the invention relates to a compound of the invention in combination with another therapeutic agent wherein the other therapeutic agent is selected from:
(a) acetylcholinesterase inhibitors, such as donepezil (AriceptTM), rivastigmine (ExelonTM) and galantamine (RazadyneTM);
(b) glutamate antagonists, such as memantine (NamendaTM);
(c) antidepressant medications for low mood and irritability, such as citalopram (CelexaTM) fluoxetine (ProzacTM), paroxeine (PaxilTM), sertraline (ZoloftTM) and trazodone (DesyrelTM);
(d) anxiolytics for anxiety, restlessness, verbally disruptive behavior and resistance, such as lorazepam (AtivanTM) and oxazepam (SeraxTM);
(e) antipsychotic medications for hallucinations, delusions, aggression, agitation, hostility and uncooperativeness, such as aripiprazole (AbilifyTM), clozapine (ClozarilTM), haloperidol (HaldolTM), olanzapine (ZyprexaTM), quetiapine (SeroquelTM), risperidone (RisperdalTM) and ziprasidone (GeodonTM);

(f) mood stabilizers, such as carbamazepine (TegretolTM) and divalproex (DepakoteTM);

(g) nicotinic apha-7 agonists;

(h) mGluR5 antagonists;

(i) H3 agonists; and

(j) amyloid therapy vaccines.

The following Examples illustrate the invention, but do not limit it.


EXAMPLES
Abbreviations













ACN
acetonitrile


AcOH
acetic acid


Boc
tert-butoxycarbonyl


Boc2O
tert-butyl dicarbonate


t-Bu
tert-butyl


nBuLi
n-butyllithium


t-BuOH
tert-butanol


DAST
diethylaminosulfurtrifluoride (Et2N)2SF3


DCM
dichloromethane


DIAD
diisopropyl azodicarboxylate


DIPEA
diisopropylethylamine


DMAP
4-dimethylaminopyridine


DMF
dimethylformamide


DMSO
dimethylsulfoxide


DPPF
1,1′-bis(diphenylphosphino)ferrocene


ee
enantiomeric excess


EDC
1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride


eq
equivalent(s)


Et3N
triethylamine


Et2O
diethylether


EtOAc
ethyl acetate


EtOH
ethanol


h
hour(s)


Hex
hexane


HOAt
1-hydroxy-7-aza-benztriazole


HOBT
hydroxy-benztriazole


HPLC
high performance liquid chromatography


IPAc
isopropyl acetate


LCMS
liquid chromatography with mass spectrometry


LDA
lithium diisopropylamide


MeOH
methanol


min
minute(s)


MS
mass spectrometry


NMR
nuclear magnetic resonance spectrometry


NP
normal phase


PE
petrolether


PPh3
triphenylphosphine


Rf
retention factor (TLC)


RP
reverse phase


Rt
retention time


rt
room temperature


SMB
simulated moving bed


TBME
tert-butyl-methyl-ether


TFA
trifluoroacetic acid


THF
tetrahydrofuran


TLC
thin layer chromatography


UPLC
ultra performance liquid chromatography









General Chromatography Information













HPLC method H1 (RtH1):








HPLC-column dimensions:
3.0 × 30 mm


HPLC-column type:
Zorbax SB-C18, 1.8 μm


HPLC-eluent:
A) water + 0.05 Vol.-% TFA; 



B) ACN + 0.05 Vol.-% TFA


HPLC-gradient:
30-100% B in 3.25 min, flow = 0.7 ml/min







HPLC method H2 (RtH2):








HPLC-column dimensions:
3.0 × 30 mm


HPLC-column type:
Zorbax SB-C18, 1.8 μm


HPLC-eluent:
A) water + 0.05 Vol.-% TFA; 



B) ACN + 0.05 Vol.-% TFA


HPLC-gradient:
0-100% B in 3.25 min, flow = 0.7 ml/min







LCMS method H3 (RtH3):








HPLC-column dimensions:
3.0 × 30 mm


HPLC-column type:
Zorbax SB-C18, 1.8 μm


HPLC-eluent:
A) water + 0.05 Vol.-% TFA, 



B) ACN + 0.05 Vol.-% TFA


HPLC-gradient:
10-100% B in 3.25 min, flow = 0.7 ml/min







LCMS method H4 (RtH4):








HPLC-column dimensions:
3.0 × 30 mm


HPLC-column type:
Zorbax SB-C8, 1.8 μm


HPLC-eluent:
A) water + 0.05 Vol.-% TFA, 



B) ACN + 0.05 Vol.-% TFA


HPLC-gradient:
10-95% B in 2.00 min, 95% B 2.00 min,



flow = 0.7 ml/min







UPLC method H5 (RtH5):








HPLC-column dimensions:
2.1 × 50 mm


HPLC-column type:
Acquity UPLC HSS T3 C18, 1.7 μm


HPLC-eluent:
A) water + 0.1 Vol.-% TFA, 



B) ACN + 0.1 Vol.-% TFA


HPLC-gradient:
5-100% B in 1.5 min, flow = 1.0 ml/min







LCMS method H6 (RtH6):








HPLC-column dimensions:
3.0 × 30 mm


HPLC-column type:
Zorbax SB-C18, 1.8 μm


HPLC-eluent:
A) water + 0.05 Vol.-% TFA; 



B) ACN + 0.05 Vol.-% TFA


HPLC-gradient:
40-100% B in 3.25 min, flow = 0.7 ml/min







LCMS method H7 (RtH7):








HPLC-column dimensions:
3.0 × 30 mm


HPLC-column type:
Zorbax SB-C18, 1.8 μm


HPLC-eluent:
A) water + 0.05 Vol.-% TFA; 



B) ACN + 0.05 Vol.-% TFA


HPLC-gradient:
50-100% B in 3.25 min, flow = 0.7 ml/min







LCMS method H8 (RtH8):








HPLC-column dimensions:
4.0 × 20 mm


HPLC-column type:
Mercury MS Synergi, 2 μm


HPLC-eluent:
A) water + 0.1 Vol.-% formic acid, 



B) ACN


HPLC-gradient:
0.5 min 30% B, 30-95% B in 1 min, 



0.9 min 95% B, flow = 2.0 ml/min


HPLC-column temperature:
30° C.







LCMS method H9 (RtH9):








HPLC-column dimensions:
4.0 × 20 mm


HPLC-column type:
Mercury MS Synergi, 2 μm


HPLC-eluent:
A) water + 0.1 Vol.-% formic acid, 



B) ACN


HPLC-gradient:
0.5 min 70% B, 70-100% B in 1 min, 



0.6 min 70% B, flow = 2.0 ml/min


HPLC-column temperature:
30° C.







UPLC method H10 (RtH10):








HPLC-column dimensions:
2.1 × 50 mm


HPLC-column type:
Acquity UPLC HSS T3, 1.8 μm


HPLC-eluent:
A) water + 0.05 Vol.-% formic acid + 



3.75 mM ammonium acetate



B) ACN + 0.04 Vol.-% formic acid


HPLC-gradient:
2-98% B in 1.7 min, 98% B 0.45 min, 



flow = 1.2 ml/min







LCMS method H11 (RtH11):








HPLC-column dimensions:
2.1 × 30 mm


HPLC-column type:
Ascentis Express C18, 2.8 μm


HPLC-eluent:
A) water + 0.05 Vol.-% formic acid +



3.75 mM ammonium acetate,



B) ACN + 0.04 Vol.-% formic acid


HPLC-gradient:
2-98% B in 1.4 min, 0.75 min 98% B, 



flow = 1.2 ml/min


HPLC-column temperature:
50° C.









Example 1
Furan-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




a) 2-Amino-2-(3-bromo-phenyl)-propionitrile
A mixture of 1-(3-bromo-phenyl)-ethanone (10 g, 50 mmol), NH4Cl (6.4 g, 100 mmol) and KCN (6.5 g, 100 mmol) was dissolved in ammonia (200 ml). The solution was stirred at room temperature for 3 days. The mixture was extracted with diethylether (3×300 ml). The organic phase was washed with water and brine, dried with Na2SO4 and concentrated in vacuo to yield the title compound (also containing some unreacted starting material). 1H-NMR (400 MHz, CDCl3): 7.84 (s, 1H), 7.59 (d, 1H), 7.48 (d, 1H), 7.28 (m, 1H), 1.75 (s, 3H).
b) 2-Amino-2-(3-bromo-phenyl)-propionic acid hydrochloride
2-Amino-2-(3-bromo-phenyl)-propionitrile (10 g, 44 mmol) was added to concentrated hydrochloric acid (100 ml) at room temperature. The mixture was refluxed overnight and then concentrated in vacuo to give a crude product, which was washed with EtOAc to yield the pure title compound. 1H-NMR (400 MHz, CD3OD): 7.62 (m, 2H), 7.48 (m, 2H), 1.82 (s, 3H).
c) 2-Amino-2-(3-bromo-phenyl)-propan-1-ol
NaBH4 (38 g, 1.125 mol) was added at room temperature to a slurry of 2-amino-2-(3-bromo-phenyl)-propionic acid hydrochloride (105 g, 375 mmol) in dry THF. At 0° C. BF3—O(C2H5)2 (158 g, 1.125 mol) was added dropwise. The mixture was allowed to warm to room temperature, stirred for three days, quenched with 1M aqueous NaOH solution, concentrated in vacuo to remove the THF and extracted with EtOAc (3×300 ml). The organic phase was washed with 1M aqueous NaOH solution, dried with sodium sulfate and concentrated in vacuo to yield the title compound, which was used in the next reaction step without further purification. 1H-NMR (400 MHz, CDCl3): 7.61 (s, 1H), 7.35 (m, 2H), 7.21 (m, 1H), 3.58 (q, 2H), 1.42 (s, 3H).
d) N-[1-(3-Bromo-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide
2-Chloroacetyl chloride (2.24 g, 19.8 mmol) was added dropwise at 0° C. to a suspension of 2-amino-2-(3-bromo-phenyl)-propan-1-ol (3.8 g, 16.5 mmol), K2CO3 (4.55 g, 33 mmol) and dichloromethane (40 ml). The mixture was allowed to warm to room temperature over a period of approximately 3 h, washed with 1N hydrochloric acid and brine, dried with Na2SO4 and evaporated in vacuo to yield the crude title compound. 1H-NMR (400 MHz, CDCl3): 7.43 (m, 2H), 7.23 (m, 2H), 4.10-4.03 (m, 4H), 1.71 (s, 3H).
e) 5-(3-Bromo-phenyl)-5-methyl-morpholin-3-one
The crude N-[1-(3-bromo-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide (70 g, 230 mmol) was dissolved in tert-butanol (1 l). The solution was treated with portions of potassium tert-butoxide (52 g, 460 mmol). The mixture was refluxed for 30 min, after cooling quenched with water and evaporated. The residue was dissolved in EtOAc (500 ml) and washed with water and brine. The organic phase was dried with Na2SO4 and concentrated in vacuo to yield the crude title compound. The crude product was purified by chromatography on silica gel (PE/EtOAc=20:1 to 1:1) to give the title compound in the form of a grey solid. 1H-NMR (400 MHz, DMSO-d6): 8.66 (s, 1H), 7.60 (s, 1H), 7.48 (d, 1H), 7.44 (d, 1H), 7.34 (t, 1H), 4.02 (s, 2H), 3.92 (d, 1H), 3.68 (d, 1H), 1.38 (s, 3H).
f) 5-(3-Bromo-phenyl)-5-methyl-morpholine-3-thione
A solution of 5-(3-bromo-phenyl)-5-methyl-morpholin-3-one (18 g, 67 mmol) in dry THF was treated with Lawesson's reagent (27 g, 67 mmol) in one portion at room temperature. The mixture was refluxed for 2 h. The title compound was obtained by chromatography on silica gel (PE/EtOAc=30:1 to 10:1). 1H-NMR (400 MHz, DMSO-d6): 11.08 (s, 1H), 7.50 (m, 2H), 7.35 (m, 2H), 4.36 (s, 2H), 4.00 (m, 1H), 3.73 (m, 1H), 1.51 (s, 3H).
g) 5-(3-Bromo-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
To a solution of 5-(3-bromo-phenyl)-5-methyl-morpholine-3-thione (5 g, 17.5 mmol) in MeOH/NH3 (110 ml) were added at room temperature t-BuOOH (28 ml, 65%) and NH4OH (47 ml, 25%). The mixture was stirred overnight, quenched with aqueous Na2S2O3 solution, concentrated in vacuo to remove the methanol solution and extracted with EtOAc (3×30 ml). The organic phase was dried with Na2SO4 and concentrated in vacuo to give the crude product, which was purified by preparative HPLC [column: Venusil XBP-C18, 250×21.2 mm, 10 μm; injection volume: 10 ml/injection; mobile phase: CH3CN/H2O=10 to 35% (0.1% formic acid) gradient for 15 min, washed with 95% CH3CN for 4 min, back to 10% balance for 4 min] to give the title compound in the form of a formic acid salt. 1H-NMR (300 MHz, DMSO-d6): 9.99 (s, 1H), 8.39 (s, 1H), 7.65 (s, 1H), 7.55 (d, 1H), 7.47 (d, 1H), 7.39 (t, 1H), 4.46 (s, 2H), 4.05 (d, 1H), 3.85 (d, 1H), 1.55 (s, 3H).
h) [5-(3-Bromo-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A mixture of 5-(3-bromo-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (4.73 g, 15 mmol) and dichloromethane was cooled to 0° C., treated with (Boc)2O (4.26 g, 19.5 mmol) and DIPEA (2.91 g, 22.5 mmol) and stirred for 17 h at room temperature. 300 ml of water were added dropwise, the phases were separated, the aqueous phase was extracted twice with dichloromethane, and the combined organic phases were washed with 1M aqueous HCl solution and water, dried with Na2SO4 and evaporated under reduced pressure to yield the title compound. 1H-NMR (500 MHz, DMSO-d6): 9.58 (br, 1H), 7.62 (s, 1H), 7.40-7.25 (m, 3H), 4.50-4.30 (m, 2H), 3.75-3.35 (m, 2H), 1.45 (s, 3H), 1.41 (s, 9H); MS: 369, 371 [(M+H)+].
i) [5-(3-Azido-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
[5-(3-Bromo-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (5.03 g, 12.67 mmol), sodium azide (1.647 g, 25.3 mmol), sodium ascorbate (0.125 g, 0.63 mmol), copper iodide (0.241 g, 1.27 mmol) and (1R,2R)—N,N′-dimethyl-cyclohexane-1,2-diamine (0.270 g, 1.90 mmol) were dissolved in ethanol (17.7 ml) and water (7.6 ml). The mixture was stirred under N2 at 90° C. for 4 h and then poured into 1M aqueous KHCO3 solution. The mixture was extracted with EtOAc, and the organic phase was washed with brine, dried with Na2SO4 and evaporated under reduced pressure. The residue was purified by chromatography on silica gel (cyclohexane/EtOAc=7:3) to yield the title compound. 1H-NMR (500 MHz, DMSO-d6): 9.57 (br, 1H), 7.38 (m, 1H), 7.24 (d, 1H), 7.18 (br, 1H), 7.0 (br, 1H), 4.50-4.30 (m, 2H), 3.75-3.35 (m, 2H), 1.41 (s, 9H), 1.36 (s, 3H); MS: 332 [(M+H)+].
j) [5-(3-Amino-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A solution of [5-(3-azido-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (497 mg, 1.50 mmol) in EtOAc (37 ml) was hydrogenated using Lindlar catalyst (10 h, room temperature). The mixture was filtered through Celite, and the filtrate was evaporated under reduced pressure yielding the title compound in the form of a colourless solid. 1H-NMR (500 MHz, DMSO-d6): 9.57 (br, 1H), 6.97 (br, 1H), 6.55 (s, 1H), 6.52 (d, 1H), 6.45 (br, 1H), 5.08 (br, 2H), 4.40-4.30 (m, 2H), 3.75-3.45 (m, 2H), 1.47 (s, 3H), 1.39 (s, 9H); MS: 306 [(M+H)+].
k) (5-{3-[(Furan-2-carbonyl)-amino]-phenyl}-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
[5-(3-Amino-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (264 mg, 0.865 mmol), furan-2-carboxylic acid (107 mg, 0.951 mmol) and HOBT (172 mg, 1.124 mmol) were dissolved in dichloromethane under N2 at 0° C. DIPEA (112 mg, 0.865 mmol) and EDC (182 mg, 0.951 mmol) were added. The mixture was stirred at 0° C. for 10 min, then allowed to warm to room temperature, stirred for 17 h at room temperature, quenched with 1M aqueous KHCO3 solution and extracted with dichloromethane. The organic phase was washed with water and brine, dried with Na2SO4 and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (cyclohexane/EtOAc) to yield the title compound in the form of a colourless solid. 1H-NMR (400 MHz, DMSO-d6): 9.86 (br, 1H), 9.27 (br, 1H), 7.83 (d, 1H), 7.69 (m, 2H), 7.30 (m, 2H), 7.15 (dd, 1H), 6.65 (m, 1H), 4.40-4.30 (m, 2H), 3.75-3.55 (m, 2H), 1.52 (s, 3H), 1.44 (s, 9H); MS: 400 [(M+H)+].
l) Furan-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride
A solution of (5-{3-[(furan-2-carbonyl)-amino]-phenyl}-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (39.9 mg, 0.1 mmol) in dichloromethane was treated with 4M HCl in dioxane (40 eq). The mixture was warmed to 40° C. for 10 h and then evaporated under reduced pressure to yield the title compound (hydrochloride salt) in the form of a colourless solid. 1H-NMR (500 MHz, DMSO-d6): 10.65 (1H, NH+), 10.31 (s, 1H), 9.14 (br, 1H), 8.52 (br, 1H), 7.95 (s, 1H), 7.82 (s, 1H), 7.77 (d, 1H), 7.40 (m, 2H), 7.18 (d, 1H), 6.72 (m, 1H), 4.59 (s, 2H), 3.87 (dd, 2H), 1.64 (s, 3H); MS: 300 [(M+H)+].
Example 2
5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




a) (5-{3-[(5-Bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
[5-(3-Amino-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (264 mg, 0.865 mmol), 5-bromo-pyridine-2-carboxylic acid (192 mg, 0.951 mmol) and HOBT (172 mg, 1.124 mmol) were dissolved in dichloromethane under N2 at 0° C. DIPEA (112 mg, 0.865 mmol) and EDC (182 mg, 0.951 mmol) were added. The mixture was stirred at 0° C. for 10 min, then allowed to warm to room temperature, stirred for 17 h at room temperature, quenched with 1M aqueous KHCO3 solution and extracted with dichloromethane. The organic phase was washed with water and brine, dried with Na2SO4 and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (cyclohexane/EtOAc) to yield the title compound in the form of a colourless solid. 1H-NMR (400 MHz, DMSO-d6, 81° C.): 10.32 (1H, NH), 9.30 (br, 1H), 8.81 (s, 1H), 8.29 (dd, 1H), 8.08 (d, 1H), 7.81 (m, 2H), 7.33 (m, 1H), 7.19 (d, 1H), 4.40-4.30 (m, 2H), 3.75-3.55 (m, 2H), 1.53 (s, 3H), 1.45 (s, 9H); MS: 489 [(M+H)+].
b) 5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride
A solution of (5-{3-[(5-bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)carbamic acid tert-butyl ester (44.4 mg, 0.1 mmol) in dichloromethane was treated with 4M HCl in dioxane (40 eq). The mixture was warmed to 40° C. for 10 h and then evaporated under reduced pressure to yield the title compound (hydrochloride salt) in the form of a colourless solid. 1H-NMR (500 MHz, DMSO-d6): 10.70 (s, 1H), 10.62 (s, 1H), 9.14 (s, 1H), 8.87 (d, 1H), 8.52 (s, 1H), 8.34 (dd, 1H), 8.11 (d, 1H), 7.96 (m, 2H), 7.43 (t, 1H), 7.21 (d, 1H), 4.59 (s, 2H), 3.88 (m, 2H), 1.65 (s, 3H); MS: 389 [(M+H)+].
Examples 3 to 30
The compounds listed in Table 1 were prepared by procedures analogous to those used in examples 1 and 2.










TABLE 1








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







 3




10.73 (s, 1H), 10.65 (s, 1H), 9.18 (s, 1H), 8.87 (d, 1H), 8.57 (s, 1H), 8.34 (dd, 1H), 8.11 (d, 1H), 7.96 (m, 2H), 7.43 (t, 1H), 7.22 (d, 1H), 4.59 (s, 2H), 3.88 (m, 2H), 1.65 (s, 3H)
389



5-Bromo-pyridine-2-carboxylic acid [3-





((R)-5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


 4




10.73 (s, 1H), 10.65 (s, 1H), 9.18 (s, 1H), 8.87 (d, 1H), 8.57 (s, 1H), 8.34 (dd, 1H), 8.11 (d, 1H), 7.96 (m, 2H), 7.43 (t, 1H), 7.22 (d, 1H), 4.59 (s, 2H), 3.88 (m, 2H), 1.64 (s, 3H)
389



5-Bromo-pyridine-2-carboxylic acid [3-





((S)-5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


 5




9.91 (s, 1H), 8.61 (s, 1H), 7.76 (s, 1H), 7.65 (d, 1H), 7.23 (t, 1H), 7.16 (d, 1H), 5.57 (br, 2H), 4.00-3.85 (m, 2H), 3.60-3.40 (m, 2H), 1.34 (s, 3H)
315



2-Methyl-oxazole-4-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


 6




10.51 (s, 1H), 9.16 (s, 1H), 8.70 (s, 1H), 7.87 (s, 1H), 7.76 (d, 1H), 7.29 (t, 1H), 7.21 (d, 1H), 5.76 (br, 2H), 4.00-3.85 (m, 2H), 3.63-3.48 (m, 2H), 1.37 (s, 3H)
326



5-Methyl-pyrazine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


 7




10.85 (s, 1H), 10.65 (s, 1H), 9.24 (s, 2H), 9.16 (s, 1H), 8.55 (s, 1H), 7.90 (m, 2H), 7.44 (t, 1H), 7.23 (d, 1H), 4.59 (s, 2H), 3.91 (m, 2H), 1.65 (s, 3H)
390



5-Bromo-pyrimidine-2-carboxylic acid [3-





(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


 8




10.70 (s, 2H), 9.19 (s, 1H), 8.77 (m, 2H), 8.57 (s, 1H), 7.94 (m, 2H), 7.73 (d, 1H), 7.60 (t, 1H), 7.43 (t, 1H), 7.21 (d, 2H), 4.59 (s, 2H), 3.89 (m, 2H), 1.65 (s, 3H)
350



Imidazo[1,2-a]pyridine-2-carboxylic acid





[3-(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


 9




10.69 (s, 1H), 10.65 (s, 1H), 9.15 (s, 1H), 8.57 (d, 1H), 8.53 (s, 1H), 7.95 (t, 1H), 7.87 (m, 2H), 7.76 (m, 1H), 7.43 (t, 1H), 7.22 (d, 1H), 4.59 (s, 2H), 3.91 (m, 2H), 1.64 (s, 3H)
329



3-Fluoro-pyridine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


10




10.60 (s, 1H), 9.98 (s, 1H), 9.12 (s, 1H), 8.49 (s, 1H), 7.87 (m, 2H), 7.37 (t, 1H), 7.16 (d, 1H), 4.58 (s, 2H), 3.88 (m, 2H), 2.59 (s, 3H), 2.46 (s, 3H), 1.63 (s, 3H)
329



2,5-Dimethyl-oxazole-4-carboxylic acid





[3-(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


11




10.63 (s, 1H), 10.24 (s, 1H), 9.13 (s, 1H), 8.51 (s, 1H), 8.29 (s, 1H), 7.89 (m, 1H), 7.40 (t, 1H), 7.18 (d, 1H), 4.58 (s, 2H), 3.88 (m, 2H), 2.77 (s, 3H), 1.64 (s, 3H)
331



2-Methyl-thiazole-4-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


12




13.57 (s, 1H), 10.60 (s, 1H), 10.38 (s, 1H), 9.14 (s, 1H), 8.52 (s, 1H), 7.92 (d, 1H), 7.83 (m, 2H), 7.41 (t, 1H), 7.20 (d, 1H), 7.04 (d, 1H), 4.58 (s, 2H), 3.89 (m, 2H), 1.63 (s, 3H)
328



6-Hydroxy-pyridazine-3-carboxylic acid





[3-(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


13




10.71 (s, 1H), 10.65 (s, 1H), 9.16 (s, 1H), 8.75 (d, 1H), 8.54 (s, 1H), 8.17 (d, 1H), 8.09 (t, 1H), 7.97 (m, 2H), 7.70 (m, 1H), 7.43 (t, 1H), 7.21 (d, 1H), 4.59 (s, 2H), 3.91 (m, 2H), 1.65 (s, 3H) 
311



Pyridine-2-carboxylic acid [3-(5-amino-3-





methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-





phenyl]-amide hydrochloride




 


14




10.88 (s, 1H), 10.62 (s, 1H), 9.22 (s, 1H), 9.14 (s, 1H), 8.59 (m, 1H), 8.53 (s, 1H), 8.31 (d, 1H), 7.96 (m, 2H), 7.44 (t, 1H), 7.23 (d, 1H), 4.59 (s, 2H), 3.88 (m, 2H), 1.65 (s, 3H)
336



5-Cyano-pyridine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


15




10.90 (s, 1H), 10.60 (s, 1H), 9.28 (s, 1H), 9.20 (s, 1H), 9.10 (s, 1H), 8.96 (s, 1H), 8.50 (s, 1H), 7.94 (m, 2H), 7.40 (t, 1H), 7.21 (m, 2H), 4.59 (s, 2H), 3.88 (m, 2H), 1.64 (s, 3H)
446



5-(3-Trifluoromethyl-pyrazol-1-yl) -





pyrazine-2-carboxylic acid [3-(5-amino-3-





methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-





phenyl]-amide hydrochloride




 


16




10.80 (s, 1H), 10.60 (s, 1H), 9.12 (m, 3H), 8.60 (s, 1H), 8.50 (s, 1H), 7.94 (m, 2H), 7.45 (t, 1H), 7.21 (d, 1H), 6.55 (s, 1H), 4.59 (s, 2H), 3.88 (m, 2H), 2.35 (s, 3H), 1.64 (s, 3H)
392



5-(3-Methyl-pyrazol-1-yl)-pyrazine-2-





carboxylic acid [3-(5-amino-3-methyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-





amide hydrochloride




 


17




10.91 (s, 1H), 10.60 (br, 1H), 9.11 (br, 1H), 9.07 (s, 1H), 8.72 (s, 1H), 8.50 (br, 1H), 7.76 (m, 2H), 7.46 (t, 1H), 7.26 (d, 1H), 4.58 (s, 2H), 3.89 (m, 2H), 1.64 (s, 3H)
413



3-Chloro-5-trifluoromethyl-pyridine-2-





carboxylic acid [3-(5-amino-3-methyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-





amide hydrochloride




 


18




10.60 (s, 1H), 9.16 (s, 1H), 8.90 (s, 1H), 8.50 (s, 1H), 8.42 (s, 1H), 7.94 (m, 2H), 7.40 (t, 1H), 7.21 (d, 1H), 4.59 (s, 2H), 4.05 (s, 3H), 3.88 (m, 2H), 1.64 (s, 3H)
342



5-Methoxy-pyrazine-2-carboxylic acid [3-





(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


19




13.00 (s, 1H), 10.60 (s, 1H), 10.25 (s, 1H), 9.16 (s, 1H), 8.48 (s, 1H), 8.10 (br, 1H), 8.05 (s, 1H), 7.91 (d, 1H), 7.85 (s, 1H), 7.38 (t, 1H), 7.15 (d, 1H), 4.59 (s, 2H), 3.88 (m, 2H), 1.64 (s, 3H)
328



5-Hydroxy-pyrazine-2-carboxylic acid [3-





(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


20




10.65 (s, 1H), 10.42 (s, 1H), 9.14 (s, 1H), 8.52 (s, 1H), 8.22 (s, 1H), 7.80 (s, 1H), 7.75 (d, 1H), 7.56 (s, 1H), 7.40 (m, 2H), 7.18 (d, 1H), 4.59 (s, 2H), 3.87 (m, 2H), 1.64 (s, 3H)
379



4-Bromo-furan-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


21




10.71 (s, 1H), 10.60 (s, 1H), 9.25 (s, 1H), 8.79 (s, 1H), 8.52 (s, 1H), 8.18 (m, 2H), 7.96 (m, 2H), 7.42 (t, 1H), 7.20 (d, 1H), 4.58 (s, 2H), 3.89 (m, 2H), 1.64 (s, 3H)
345



5-Chloro-pyridine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


22




10.81 (s, 1H), 10.60 (br, 1H), 9.11 (s, 1H), 8.51 (d, 1H), 8.34 (d, 1H), 7.95 (m, 2H), 7.44 (m, 2H), 7.22 (d, 1H), 4.58 (s, 2H), 3.89 (m, 2H), 1.64 (s, 3H)
379



5-Trifluoromethyl-pyridine-2-carboxylic





acid [3-(5-amino-3-methyl-3,6-dihydro-





2H-[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


23




10.60 (s, 1H), 10.35 (s, 1H), 9.11 (s, 1H), 8.72 (s, 1H), 8.48 (s, 1H), 7.80 (s, 2H), 7.70 (d, 1H), 7.43 (m, 2H), 7.21 (d, 1H), 4.58 (s, 2H), 3.88 (m, 2H), 1.64 (s, 3H)
368



5-Trifluoromethyl-furan-3-carboxylic acid





[3-(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


24




10.60 (s, 1H), 10.44 (s, 1H), 9.12 (s, 1H), 8.50 (s, 1H), 7.91 (m, 2H), 7.84 (s, 1H), 7.77 (m, 3H), 7.42 (t, 1H), 7.20 (d, 1H), 4.59 (s, 2H), 3.88 (m, 2H), 1.64 (s, 3H)
388



N-[3-(5-Amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-4-bromo-





benzamide hydrochloride




 


Reference Example 25




10.60 (s, 1H), 9.96 (s, 1H), 9.15 (s, 1H), 8.53 (s, 1H), 7.72 (s, 1H), 7.56 (m, 1H), 7.33 (t, 1H), 7.09 (d, 1H), 4.57 (s, 2H), 3.86 (m, 2H), 2.34 (m, 1H), 1.80-1.15 (m, 10H), 1.60 (s, 3H)
316



Cyclohexanecarboxylic acid [3-(5-amino-





3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-





phenyl]-amide hydrochloride




 


Reference Example 26




10.55 (s, 1H), 10.11 (s, 1H), 9.09 (s, 1H), 8.46 (d, 1H), 7.73 (s, 1H), 7.54 (d, 1H), 7.35 (t, 1H), 7.12 (d, 1H), 4.57 (s, 2H), 3.85 (m, 2H), 2.09 (m, 2H), 1.91 (m, 4H), 1.82 (m, 2H), 1.69 (m, 2H), 1.61 (s, 3H)
352



4,4-Difluoro-cyclohexanecarboxylic acid





[3-(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


27




10.70 (s, 1H), 10.65 (s, 1H), 9.18 (s, 1H), 8.57 (m, 2H), 8.07 (m, 1H), 7.98 (d, 1H), 7.95 (s, 1H), 7.90 (m, 1H), 7.42 (t, 2H), 7.20 (d, 1H), 4.59 (s, 2H), 3.88 (m, 2H), 2.43 (s, 3H), 1.65 (s, 3H)
325



5-Methyl-pyridine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


28




10.74 (s, 1H), 9.22 (s, 1H), 9.20 (s, 1H), 8.85 (d, 1H), 8.58 (s, 1H), 8.49 (d, 1H), 7.86 (s, 1H), 7.79 (m, 1H), 7.72 (m, 1H), 7.44 (t, 1H), 7.23 (d, 1H), 4.59 (s, 2H), 3.91 (m, 2H), 1.65 (s, 3H)
311



N-[3-(5-Amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-nicotinamide





hydrochloride




 


29




10.74 (s, 1H), 10.63 (s, 1H), 9.20 (s, 1H), 8.68 (1s, 1H), 8.59 (s, 1H), 8.18 (s, 1H), 7.88 (d, 1H), 7.81 (s, 1H), 7.41 (t, 1H), 7.19 (d, 1H), 4.59 (s, 2H), 3.88 (m, 2H(AB-sytem)), 2.58 (s, 3H), 1.65 (s, 3H)
403



5-Bromo-3-methyl-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-methyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-





amide hydrochloride




 


30




10.69 (s, 1H), 10.55 (br, 1H), 9.15 (s, 1H), 8.55 (d, 1H), 8.39 (d, 1 H), 8.14 (d, 1H), 7.96 (d, 1H), 7.92 (s, 1H), 7.64 (dd, 1H), 7.41 (t, 1H), 7.17 (d, 1H), 4.58 (s, 2H), 3.96 (s, 3H), 3.90 (m, 2H), 1.64 (s, 3H)
341



5-Methoxy-pyridine-2-carboxylic acid [3-





((R)-5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl) -phenyl]-amide





hydrochloride









The racemic (5-{3-[(5-bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester was separated into the pure enantiomers by preparative chiral HPLC (column: CHIRACEL OD-PREP; solvent: heptane/ethanol/methanol=90:5:5; flow: 1 ml/min; detection at 210 nm). These enantiomers were treated with 4M HCl in dioxane to obtain the enantiomerically pure compounds 3 and 4. Example 3: [α]D=−50.0°, c=0.519% (MeOH). Example 4: [α]D=+58.1°, c=0.498% (MeOH). Examples 29 and 30 can be obtained by a similar procedure.
Example 31
5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide




a) 2-(3-Bromo-phenyl)-2-nitro-propane-1,3-diol
A mixture of 1-bromo-3-nitromethyl-benzene (6.82 g, 31.6 mmol), formaline (35%, 5.22 ml, 66.3 mmol) and Et3N (2.2 ml, 15.78 mmol) was heated at 50° C. for 1 h, diluted with water and extracted with TBME. The organic phase was washed with brine, dried with MgSO4 and evaporated. The residue was crystallized from TBME/hexane to yield the title compound in the form of a colourless solid. TLC (hexane/EtOAc=2:1): Rf=0.2; HPLC: RtH2=3.117 min; 1H-NMR (400 MHz, CD3OD): 7.61-7.54 (m, 2H), 7.39-7.34 (m, 2H), 4.40 (d, 2H), 4.35 (d, 2H); MS: 298, 300 [(M+Na)+].
b) 2-Amino-2-(3-bromo-phenyl)-propane-1,3-diol
A solution of 2-(3-bromo-phenyl)-2-nitro-propane-1,3-diol (6.79 g, 24.59 mmol) in 100 ml of EtOH was hydrogenated in the presence of 5 g of Raney-Ni. When the take-up of hydrogen had ceased, the mixture was filtered through Celite, and the filtrate was chromatographed on silica gel (EtOAc/MeOH/25% aqueous NH3, 5%) to give the title compound in the form of a colourless solid. TLC (EtOAc/MeOH/25% aqueous NH3, 5%): Rf=0.24; HPLC: RtH2=2.354 min; 1H-NMR (400 MHz, CD3OD): 7.73 (s, 1H), 7.50 (d, 1H), 7.44 (d, 1H), 7.29 (t, 1H), 3.79 (d, 2H), 3.72 (d, 2H); MS: 246, 248 [(M+H)+].
c) N-[1-(3-Bromo-phenyl)-2-hydroxy-1-hydroxymethyl-ethyl]-2-chloro-acetamide
To a stirred suspension of 2-amino-2-(3-bromo-phenyl)-propane-1,3-diol (3.5 g, 14.22 mmol), 30 ml of THF and 30 ml of 10% aqueous Na2CO3 solution was added dropwise chloroacetyl chloride (1.472 ml, 18.5 mmol) at 0° C. over a period of 10 min. The mixture was stirred for 1 h, diluted with water and extracted with EtOAc. The organic phase was washed with 1N aqueous NaOH solution, 10% aqueous Na2CO3 solution and brine. Chromatography on silica gel (EtOAc/hexane 50-30%) gave the title compound in the form of a colourless solid. TLC (hexane/EtOAc=1:1): Rf=0.21; HPLC: RtH2=2.926 min; 1H-NMR (400 MHz, CD3OD): 7.58 (s, 1H), 7.44 (d, 1H), 7.37 (d, 1H), 7.29 (t, 1H), 4.91 (s, 2H), 4.07 (d, 2H), 4.00 (d, 2H); MS: 322, 324, 326 [(M+H)+].
d) 5-(3-Bromo-phenyl)-5-hydroxymethyl-morpholin-3-one
A suspension of N-[1-(3-bromo-phenyl)-2-hydroxy-1-hydroxymethyl-ethyl]-2-chloro-acetamide (3.24 g, 10.04 mmol) and 35 ml of t-BuOH was treated with potassium tert-butoxide (1.127 g, 10.04 mmol). The mixture was heated at reflux for 1 h and neutralized with 10 ml of 1N HCl. Water and TBME were added, and the precipitate was filtered off. The organic phase of the filtrate was separated, dried with sodium sulfate and chromatographed on silica gel (EtOAc/MeOH 1-2%) to give the title compound in the form of a colourless solid. TLC (EtOAc/MeOH 1%): Rf=0.23; HPLC: RtH2=2.839 min; 1H-NMR (400 MHz, CD3OD): 7.70 (s, 1H), 7.53-7.47 (m, 2H), 7.35 (t, 1H), 4.17 (s, 2H), 4.08 (d, 1H), 3.98 (d, 1H), 3.91 (d, 1H), 3.87 (d, 1H); MS: 287, 289 [(M+H)+].
e) 5-(3-Bromo-phenyl)-5-fluoromethyl-morpholin-3-one
A suspension of 5-(3-bromo-phenyl)-5-hydroxymethyl-morpholin-3-one (2.6 g, 9.09 mmol) and 120 ml of dichloromethane was cooled to 0° C. DAST (1.26 ml) was added dropwise. The mixture was stirred overnight, poured onto 50 ml of 10% aqueous Na2CO3 solution and ice and extracted with dichloromethane. The extract was dried with sodium sulfate and evaporated. Chromatography on silica gel (EtOAc/hexane=1:1) gave the title compound in the form of a colourless solid. TLC (hexane/EtOAc=1:1): Rf=0.31; HPLC: RtH2=3.13 min; 1H-NMR (400 MHz, CD3OD): 7.71 (s, 1H), 7.56 (d, 1H), 7.52 (d, 1H), 7.38 (t, 1H), 4.77 (d, 2H), 4.20 (s, 2H), 4.11 (d, 1H), 3.95 (d, 1H); MS: 289, 291 [(M+H)+].
f) 5-(3-Bromo-phenyl)-5-fluoromethyl-morpholine-3-thione
A mixture of 5-(3-bromo-phenyl)-5-fluoromethyl-morpholin-3-one (1.52 g, 5.28 mmol) and Lawesson's reagent (2.14 g, 5.28 mmol) in 21 ml of THF was heated at 50° C. for 1 h and then evaporated. The residue was chromatographed on silica gel (cyclohexane/EtOAc=15:1) to give the title compound in the form of a colourless foam. TLC (hexane/EtOAc=3:1): Rf=0.21; HPLC: RtH2=3.49 min; 1H-NMR (400 MHz, CD3OD): 7.65 (s, 1H), 7.58 (d, 1H), 7.47 (d, 1H), 7.39 (t, 1H), 4.87 (s, 2H), 4.63 (d, 1H), 4.50 (s, 2H), 4.02 (d, 1H); MS: 304, 306 [(M+H)+].
g) [5-(3-Bromo-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To a solution of 5-(3-bromo-phenyl)-5-fluoromethyl-morpholine-3-thione (200 mg, 0.658 mmol) in 5 ml of 7M NH3/MeOH were added t-butyl hydroperoxide (80%, 0.818 ml, 6.58 mmol) and then 1.7 ml of 25% aqueous NH4OH. After 2 h, the mixture was quenched with a saturated aqueous solution of Na2S2O3 and extracted with EtOAc. The extract was washed with brine, dried with sodium sulfate and evaporated. The crude 5-(3-bromo-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (189 mg, 0.658 mmol) was dissolved in 4 ml of dichloromethane. The solution was treated with DIPEA (0.172 ml, 0.987 mmol) and Boc2O (187 mg, 0.855 mmol). After 14 h, the mixture was diluted with dichloromethane and washed with water, 1N HCl and brine. The organic phase was dried with sodium sulfate and evaporated. The residue was chromatographed on silica gel (cyclohexane/EtOAc=6:1) to yield the title compound. TLC (hexane/EtOAc=6:1): Rf=0.20; HPLC: RtH1=2.380 min; 1H-NMR (400 MHz, CDCl3): 7.56-6.98 (m, 4H; broad signals due to rotamers), 4.80-3.60 (m, 6H), 1.42 (br, 9H); MS: 387, 389 [(M+H)+].
h) [5-(3-Azido-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A suspension of [5-(3-bromo-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (114 mg, 0.295 mmol), NaN3 (77 mg, 1.18 mmol), CuI (11 mg, 0.059 mmol), sodium ascorbate (12 mg, 0.059 mmol), N,N′-dimethyl-cyclohexane-1,2-diamine (13 mg, 0.089 mmol), 1.5 ml of EtOH and 0.6 ml of water was stirred under N2 at 90° C. for 1 h. The mixture was filtered through Celite, and the filtrate was chromatographed on silica gel (cyclohexane/EtOAc=6:1) to yield the title compound in the form of a colourless foam. TLC (hexane/EtOAc=3:1): Rf=0.33; HPLC: RtH1=2.258 min; 1H-NMR (400 MHz, CDCl3): 7.40-6.88 (m, 4H; broad signals due to rotamers), 4.75-3.60 (m, 6H), 1.42 (br, 9H); MS: 350 [(M+H)+].
i) (5-{3-[(5-Bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
A solution of [5-(3-azido-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (56 mg, 0.161 mmol) in 2 ml of EtOAc was hydrogenated in the presence of Lindlar catalyst (11 mg) for 3 h. The mixture was filtered through Celite, and the filtrate was evaporated. The crude [5-(3-amino-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (50 mg, 0.155 mmol) was taken up in 2 ml of dichloromethane. A mixture of 5-bromo-pyridine-2-carboxylic acid (34.4 mg, 0.170 mmol), HOBT (30.9 mg, 0.17 mmol) and EDC (32.6 mg, 0.17 mmol) in 2 ml of dichloromethane was added, followed by the addition of triethylamine (0.054 ml). The mixture was stirred for 4 h, treated with 5% aqueous NaHCO3 solution and extracted twice with dichloromethane. The organic phase was dried with MgSO4 and evaporated. The residue was chromatographed on silica gel (EtOAc/cyclohexane=1:4) to yield the title compound. TLC (hexane/EtOAc=3:1): Rf=0.16; HPLC: RtH1=2.763 min; 1H-NMR (400 MHz, CDCl3): 9.80 (br, 1H), 8.60 (d, 1H), 8.11 (d, 1H), 7.98 (d, 1H), 7.77 (br, 1H), 7.73 (d, 1H), 7.33 (br, 1H), 7.15 (d, 1H), 4.75-3.65 (m, 6H), 1.60 (br; minor rotamer tBu), 1.42 (br; major rotamer tBu); MS: 507, 509 [(M+H)+].
j) 5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide
A solution of (5-{3-[(5-bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (48 mg, 0.095 mmol) in 2 ml of 3N HCl in MeOH was stirred at 40° C. for 2 h. The mixture was evaporated, and the residue was purified by chromatography on silica gel with a gradient of dichloromethane and 2-10% MeOH/NH4OH (0.5%), yielding the title compound in the form of a colorless foam. TLC (dichloromethane/MeOH/25% aqueous NH4OH=90:9:1): Rf=0.28; HPLC: RtH1=2.755 min; 1H-NMR (400 MHz, CDCl3): 8.58 (d, 1H), 8.10 (d, 1H), 7.96 (dd, 1H), 7.76 (s, 1H), 7.71 (d, 1H), 7.31 (t, 1H), 7.21 (d, 1H), 4.55-4.33 (m, 2H), 4.13-3.95 (m, 3H), 3.65 (d, 1H), 4.0-3.3 (br, NH2); MS: 407, 409 [(M+H)+].
Example 32
The compound listed in Table 2 was prepared by a procedure analogous to that used in example 31 starting from 1-bromo-3-chloro-5-nitromethyl-benzene.










TABLE 2








MS




1H-NMR
[m/z;


Example
Compound
(δ; CD3OD)
(M + 1)+]







32




8.85 (d, 1H), 8.29 (m, 1H), 8.17 (d, 1H), 8.07 (m, 1H), 7.97 (s, 1H), 7.37 (s, 2H), 5.05 (m, 1H), 4.95 (m, 1H), 4.70 (s, 2H), 4.19 (m, 2H)
442



5-Bromo-pyridine-2-carboxylic acid





[3-(5-amino-3-fluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-5-





chloro-phenyl]-amide





hydrochloride









Example 33
5-Bromo-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]amide




a) (R)45-(3-Amino-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A solution of 740 mg (2.118 mmol) [5-(3-azido-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (Example 31h) in 5 ml THF and 5 ml EtOH was stirred in the presence of 35 mg 10% Pd—C under hydrogen. After 3 h the mixture was filtered over celite, concentrated and crystallized from EtOAc/hexane to give a beige solid. The racemic product was separated via prep HPLC on Chiralpak AD-H 250×4.6 mm column using heptan/EtOH 1:1 as an eluent. The desired compound was the slower eluting (R)-enantiomer. TLC: Rf (Hexane/EtOAc 2:1)=0.15. HPLC: RtH4=1.764 min; ESIMS [M+H]+=324. 1H-NMR (CDCl3, 360 MHz, broad signals due to hindered rotation): 10.5 (br, 1H), 7.12 (br, 1H), 6.69 (d, 1H), 6.59 (br d, 1H), 4.8-4.0 (m, 8H), 1.48 (br s, 9H).
b) ((R)-5-{3-[(5-Bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
To an at 0° C. stirred solution of 105 mg (0.325 mmol) (R)-[5-(3-amino-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester, 72 mg (0.357 mmol) 5-bromo-pyridine-2-carboxylic acid, 57 mg (0.422 mmol) HOAt and 82 mg (0.812 mmol) Et3N in 3 ml DCM were added 81 mg (0.422 mmol) EDC.HCl. After 18 h the mixture was diluted with EtOAc and washed with water, 5% aqueous NaHCO3 and brine. Chromatography on silica gel (hexane/EtOAc 3:1) gave the desired product as a colorless solid.
TLC: Rf (Hexane/EtOAc 2:1)=0.31.
HPLC: RtH4=2.481 min; ESIMS [M+H]+=507/509(1Br);
1H-NMR (360 MHz, CDCl3, major rotamer only): 9.80 (br s, 1H), 8.61 (s, 1H), 8.13 (d, 1H), 7.87 (dd, 1H), 7.77 (br s, 1H), 7.73 (d, 1H), 7.35 (br, 1H), 7.15 (t, 1H), 4.90-4.20 (m, 5H), 4.15 (d, 1H), 3.75 (br, 1H), 1.45 (br s, 9H).
c) 5-Bromo-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide
A solution of 117 mg (0.231 mmol) ((R)-5-{3-[(5-bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester in 2 ml 4N HCl in dioxane was stirred at 45° C. overnight. The mixture was concentrated and crystallized from EtOAc/hexane to yield the title compound as colorless crystals.
Rf (DCM/MeOH/NH3 aqueous, 25%; 9:1:0.1)=0.15
HPLC: RtH3=2.786 min; ESIMS [M+H]+=407/409(1Br);
1H-NMR (600 MHz, DMSO-d6): δ 10.81 (s, 1H), 10.78 (s, 1H), 8.88 (s, 1H), 8.65 (s, 1H), 8.36 (d, 1H), 8.10 (d, 1H), 8.00 (d, 1H), 7.48 (t, 1H), 7.28 (d, 1H), 4.89 (d, 2H, CH2F), 4.62 (s, 2H), 4.10 (d, 1H), 4.01 (d, 1H).
Example 34
5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




a) 1-(3-Bromo-phenyl)-2,2-difluoro-ethanone
1-Bromo-3-iodo-benzene (22.5 g, 90 mmol, Aldrich) was dissolved in THF and cooled to −78° C. nBuLi (69.8 ml, 90 mmol) was added over 15 minutes and the reaction was stirred for 30 min. at −78° C. Difluoro-acetic acid ethyl ester (16.59 ml, 153 mmol, Aldrich) was added dropwise and stirring was continued for 3 hrs. After completion the reaction was quenched by the addition of 329 ml 2 M HCl solution and reaction was warmed to r.t. The phases were separated and the aqueous phases was extracted with Et2O. The organic phases were washed with water and brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by automated column chromatography (cyclohexane/ethyl acetate) to yield the title compound as a yellow oil. 1H-NMR (360 MHz, DMSO-d6): 8.18 (s, 1H), 8.02 (m, 2H), 7.61 (t, 1H), 7.21 (t, 1H, CHF2); GC/MS: 234 [(M+H)+].
b) [1-(3-Bromo-phenyl)-2,2-difluoro-ethylidene]-carbamic acid tert-butyl ester
1-(3-Bromo-phenyl)-2,2-difluoro-ethanone (15.36 g, 65.4 mmol) and N-boc-imino(triphenyl)phosphorane (27.1 g, 71.9 mmol) were heated for 75 hrs in toluene under N2. After completion, volatiles were removed under reduced pressure and 457 ml hexane were added. The reaction was heated to reflux, cooled down and the formed precipitate was filtered off. The filtrate was evaporated yielding the crude product which was purified by column chromatography (cylcohexane/TBME). Yellow oil was obtained as product. 1H-NMR (360 MHz, DMSO-d6): 8.02 (m, 1H), 7.85 (m, 1H), 7.55 (m, 2H), 7.20 (t, 1H, CHF2); MS: 234 [(M+H-Boc)+].
c) [1-(3-Bromo-phenyl)-1-difluoromethyl-allyl]-carbamic acid tert-butyl ester
[1-(3-Bromo-phenyl)-2,2-difluoro-ethylidene]-carbamic acid tert-butyl ester (9.09 g, 27.2 mmol) was dissolved in toluene and cooled to −20° C. under N2. Using a syringe pump, vinylmagnesiumbromide (42.5 ml, 34.0 mmol) was added (1 eq. per hour). After 1.25 hrs no starting material was left and 218 ml half-saturated NH4Cl solution was added to the reaction. The product was extracted with TBME. The organic phases were washed with water and brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by automated column chromatography (cyclohexane/TBME) to yield the title compound as a yellowish oil. 1H-NMR (600 MHz, DMSO-d6): 7.81 (br, 1H, NH), 7.52 (m, 2H), 7.35 (m, 2H), 6.48 (t, 1H, CHF2), 5.45 (d, 1H), 5.15 (d, 1H), 1.32 (s, 9H); MS: 362 [(M+H)+].
d) [1-(3-Bromo-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-carbamic acid tert-butyl ester
[1-(3-Bromo-phenyl)-1-difluoromethyl-allyl]-carbamic acid tert-butyl ester (7.88 g, 21.76 mmol) was dissolved in 218 ml dichloromethane and 73 ml methanol. NaHCO3 (2.74 g, 32.6 mmol) was added and the reaction mixture was cooled to −78° C. The solution was treated with O3 for 30 min. (until the reaction mixture turned blue). Gas was stopped and stirring was continued for 15 minutes. The reaction was flushed with oxygen and nitrogen until color disappeared. NaBH4 (2.47 g, 65.3 mmol) was added in three protions and stirring was continued for 30 min. at −78° C. The reaction was warmed to 0° C. and poured onto 435 ml 1 M HCl solution. The product was extracted with TBME. The organic phases were washed with water and brine, dried over Na2SO4 and concentrated under reduced pressure to yield the title compound as a greenish oil. 1H-NMR (600 MHz, DMSO-d6): 7.49 (m, 2H), 7.38 (br, 1H, NH), 7.32 (m, 2H), 6.37 (t, 1H, CHF2), 5.20 (br, 1H), 3.95 (m, 1H), 3.86 (br, 1H), 1.32 (s, 9H); MS: 366 [(M+H)+].
e) 2-Amino-2-(3-bromo-phenyl)-3,3-difluoro-propan-1-ol hydrochloride
[1-(3-Bromo-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-carbamic acid tert-butyl ester (8.408 g, 22.96 mmol) was dissolved in 105 ml 4 N HCl in dioxane. The reaction was stirred for 45 min. After completion volatiles were removed under reduced pressure to yield a white solid. 1H-NMR (360 MHz, DMSO-d6): 9.30 (br, 3H, NH3+), 7.85 (s, 1H), 7.70 (d, 1H), 7.60 (d, 1H), 7.49 (t, 1H), 6.63 (t, 1H, CHF2), 6.03 (br, 1H), 4.05 (m, 2H); MS: 266 [(M+H)+].
f) N-[1-(3-Bromo-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-2-chloro-acetamide
2-Amino-2-(3-bromo-phenyl)-3,3-difluoro-propan-1-ol hydrochloride (6.5 g, 24.43 mmol) was put between 60 ml aqueous 2 M Na2CO3 solution and 60 ml dichloromethane and cooled to 0° C. under strong stirring. Then chloroacetylchloride (2.94 ml, 36.6 mmol), diluted in 8 ml dichloromethane, was added dropwise to the biphasic solution. After the complete addition, the reaction was stirred for 30 minutes at r.t. After completion 10 ml MeOH were added and stirring was continued for 10 minutes. Then TBME and water were added. The phases were separated, and the aqueous phase was extracted with TBME. The organic phases were washed with water and brine, dried over Na2SO4 and concentrated under reduced pressure to yield the title compound as off-white solid. 1H-NMR (360 MHz, DMSO-d6): 8.72 (s, 1H), 7.53 (m, 2H), 7.35 (m, 2H), 6.48 (t, 1H, CHF2), 5.39 (t, 1H), 4.18 (m, 2H), 3.10 (s, 2H); MS: 342 [(M+H)+].
g) 5-(3-Bromo-phenyl)-5-difluoromethyl-morpholin-3-one
N-[1-(3-Bromo-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-2-chloro-acetamide (8.10 g, 23.65 mmol) and potassium tert-butoxide (5.31 g, 47.3 mmol) were heated to 95° C. in 118 ml tert-butanol for 30 minutes. After completion water was added and the reaction was evaporated. The residue was put between ethyl acetate and water. The phases were separated and the aqueous phase was extracted twice with ethyl acetate. The organic phases were washed with water and brine, dried over Na2SO4 and concentrated under reduced pressure to yield the title compound as off-white solid. 1H-NMR (360 MHz, DMSO-d6): 9.13 (s, 1H, NH), 7.78 (s, 1H), 7.59 (m, 2H), 7.42 (t, 1H), 6.48 (t, 1H, CHF2), 4.28 (d, 1H), 4.10 (m, 2H), 3.92 (m, 1H); MS: 306 [(M+H)+].
h) 5-(3-Bromo-phenyl)-5-difluoromethyl-morpholine-3-thione
5-(3-Bromo-phenyl)-5-difluoromethyl-morpholin-3-one (6.10 g, 19.93 mmol) was dissolved in 63 ml dry pyridine, and P2S5 (5.32 g, 23.91 mmol) was added. The mixture was heated to 80° V for 2 hrs. After completion, the mixture was put between ethyl acetate and 1H HCl solution. Phases were separated and the organic phase was washed with 1 N HCl, saturated NaHCO3 solution and brine. The organic phases were combined, dried over Na2SO4 and concentrated under reduced pressure to yield the title compound as off-white solid. 1H-NMR (360 MHz, DMSO-d6): 8.60 (s, 1H, NH), 7.80-7.35 (m, 4H), 6.54 (t, 1H, CHF2), 4.45 (m, 2H), 4.28 (d, 1H), 4.12 (d, 1H); MS: 322 [(M+H)+].
i) 5-(3-Bromo-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
5-(3-Bromo-phenyl)-5-difluoromethyl-morpholine-3-thione (7.49 g, 23.25 mmol) was dissolved in 36 ml 7N NH3 in methanol and stirred at room temperature for 18 h. After completion, volatiles were removed under reduced pressure to yield the title compound. 1H-NMR (360 MHz, DMSO-d6): 7.80 (s, 1H), 7.52 (m, 2H), 7.33 (m, 1H), 6.25 (br, 2H, NH2), 6.04 (t, 1H, CHF2), 4.15-3.90 (m, 2H), 3.72 (d, 1H), 3.45 (d, 1H); MS: 305 [(M+H)+].
j) [5-(3-Bromo-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
5-(3-Bromo-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (6.12 g, 20.06 mmol) was dissolved in 100 ml ACN under N2 at 0° C. Then Boc2O (5.69 g, 26.1 mmol), DIPEA (5.25 ml, 30.1 mmol) and DMAP (0.25 g, 2.01 mmol) were added and the ice bath was removed. The reaction was stirred at room temperature for 90 min. After completion, the reaction was diluted with water and extracted with dichloromethane. The organic phases were washed with 1N HCl, saturated NaHCO3 sol., water and brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by automated column chromatography (cyclohexane/TBME) to yield the title compound as a brownish solid. 1H-NMR (360 MHz, DMSO-d6): 9.97 (s, 1H, NH), 7.80 (s, 1H), 7.55 (m, 2H), 7.35 (m, 1H), 6.17 (t, 1H, CHF2), 4.62 (d, 1H), 4.41 (d, 1H), 4.22 (d, 1H), 3.75 (d, 1H), 1.45 (s, 9H); MS: 405 [(M+H)+].
k) [5-(3-Azido-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
[5-(3-Bromo-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (2.25, 5.55 mmol), sodium azide (2.89 g, 44.4 mmol), sodium ascorbate (0.440 g, 2.22 mmol), copper iodide (0.423 g, 2.22 mmol) and rac-trans-N,N′-dimethyl-cyclohexane-1,2-diamine (0.790 g, 5.55 mmol) were dissolved in ethanol (76.6 ml) and water (33.0 ml). The mixture was stirred under N2 at 70° C. for 30 minutes. After completion hexane/ethyl acetate 1/1 were added and the reaction mixture was filtered over silica gel. The filtrate was evaporated and the residue was purified by chromatography on silica gel (cyclohexane/TBME 9/1 to obtain azide, later hexane/ethyl acetate 2/1 to 1/1 to obtain aniline as side product) to yield the title compound. 1H-NMR (360 MHz, CDCl3): 7.42 (m, 1H), 7.25 (m, 2H), 7.07 (m, 1H), 5.97 (t, 1H, CHF2), 4.80 (d, 1H), 4.65 (d, 1H), 4.25 (d, 1H), 3.80 (d, 1H), 1.55 (s, 9H); MS: 368 [(M+H)+].
l) [5-(3-Amino-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A solution of [5-(3-azido-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (1.71 g, 4.65 mmol) in 22 ml ethanol and 12 ml THF was hydrogenated with Pd/C (10%) (3 hrs, r.t.) The mixture was filtered through Celite, and the filtrate was evaporated and the residue was purified by chromatography on silica gel (cyclohexane/ethyl acetate) to yield the title compound as colorless solid.
1H-NMR (360 MHz, CDCl3): 7.22 (m, 1H), 6.92 (m, 1H), 6.84 (m, 1H), 6.70 (m, 1H), 5.95 (t, 1H, CHF2), 4.92 (m, 1H), 4.73 (m, 1H), 4.32 (m, 1H), 3.95 (m, 1H), 1.53 (s, 9H); MS: 342 [(M+H)+].
m) (5-{3-[(5-Bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
[5-(3-Amino-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester and 5-bromo-pyridine-2-carboxylic acid were coupled according the procedure described in example 51m). 1H-NMR (360 MHz, CDCl3): 9.92 (s, 1H, NH), 8.73 (s, 1H), 8.24 (d, 1H), 8.10 (d, 1H), 7.88 (m, 2H), 7.45 (m, 1H), 7.31 (m, 1H), 5.92 (t, 1H, CHF2), 4.84 (d, 1H), 4.65 (d, 1H), 4.31 (d, 1H), 3.96 (d, 1H), 1.52 (s, 9H); MS: 525 [(M+H)+].
n) 5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride
(5-{3-[(5-Bromo-pyridine-2-carbonyl)-amino]-phenyl}-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester was deprotected according to the procedure described in example 51). 1H-NMR (500 MHz, DMSO-d6): 10.85 (s, 1H), 10.25 (s, 1H), 9.65 (br, 1H), 8.90 (s, 1H), 8.67 (br, 1H), 8.35 (m, 1H), 8.09 (d, 1H), 7.99 (m, 2H), 7.50 (t, 1H), 7.30 (d, 1H), 6.70 (t, 1H, CHF2), 4.63 (m, 2H), 4.38 (m, 1H), 4.05 (m, 1H); MS: 425 [(M+H)+].
Examples 35 to 41
The compounds listed in Table 3 were prepared by a procedure analogous to that used in example 34.










TABLE 3








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







35




10.78 (s, 1H), 9.71 (s, 1H), 8.82 (s, 2H), 8.22 (m, 2H), 8.04 (m, 2H), 7.53 (t, 1H), 7.35 (d, 1H), 6.74 (t, 1H, CHF2), 4.67 (m, 2H), 4.41 (m, 1H), 4.08 (m, 1H)
381



5-Chloro-pyridine-2-carboxylic acid





[3-(5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-





amide hydrochloride




 


36




10.93 (s, 1H), 9.73 (s, 1H), 9.24 (s, 1H), 8.86 (s, 1H), 8.64 (d, 1H), 8.32 (d, 1H), 8.05 (m, 2H), 7.54 (t, 1H), 7.37 (d, 1H), 6.73 (t, 1H, CHF2), 4.68 (m, 2H), 4.43 (m, 1H), 4.07 (m, 1H)
372



5-Cyano-pyridine-2-carboxylic acid





[3-(5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-





amide hydrochloride




 


37




11.13 (s, 1H), 10.75 (s, 1H), 9.73 (s, 1H), 8.91 (s, 1H), 8.68 (s, 1H), 8.21 (s, 1H), 7.92 (m, 2H), 7.48 (t, 1H), 7.32 (d, 1H), 6.71 (t, 1H, CHF2), 4.65 (m, 2H), 4.40 (m, 1H), 4.05 (m, 1H), 2.58 (s, 3H)
439



5-Bromo-3-methyl-pyridine-2-





carboxylic acid [3-(5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


38




11.13 (s, 1H), 10.80 (s, 1H), 9.71 (s, 1H), 9.16 (s, 1H), 8.89 (s, 1H), 8.72 (s, 1H), 8.05 (s, 1H), 7.99 (d, 1H), 7.30 (t, 1H), 7.35 (d, 1H), 6.71 (t, 1H, CHF2), 4.65 (m, 2H), 4.40 (m, 1H), 4.05 (m, 1H), 2.58 (s, 3H)
362



5-Methyl-pyrazine-2-carboxylic acid





[3-(5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-





amide hydrochloride




 


39




11.1 (s, 1H), 10.94 (s, 1H), 9.70 (s, 1H), 8.82 (s, 1H), 8.53 (d, 1H), 8.36 (d, 1H), 8.04 (m, 2H), 7.53 (t, 1H), 7.35 (d, 1H), 6.72 (t, 1H, CHF2), 4.68 (m, 2H), 4.41 (m, 1H), 4.08 (m, 1H)
415



5-Trifluoromethyl-pyridine-2-





carboxylic acid [3-(5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


40




11.1 (s, 1H), 11.02 (s, 1H), 9.70 (s, 1H), 9.10 (s, 1H), 8.77 (s, 1H), 8.73 (s, 1H), 7.87 (s, 1H), 7.78 (d, 1H), 7.53 (t, 1H),  7.36 (d, 1H), 6.73 (t, 1H, CHF2), 4.68 (m, 2H), 4.41 (m, 1H), 4.10 (m, 1H)
449



3-Chloro-5-trifluoromethyl-pyridine-





2-carboxylic acid [3-(5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride




 


41




11.18 (s, 1H), 10.68 (s, 1H), 9.75 (s, 1H), 8.95 (s, 1H), 8.59 (s, 1H), 8.06 (s, 1H), 7.92 (m, 2H), 7.49 (t, 1H), 7.34 (d, 1H), 6.71 (t, 1H, CHF2), 4.67 (m, 2H), 4.40 (m, 1H), 4.05 (m, 1H), 2.58 (s, 3H)
395



5-Chloro-3-methyl-pyridine-2-





carboxylic acid [3-(5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide





hydrochloride









Example 42
5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




a) 1-(5-Bromo-2-fluoro-phenyl)-ethanone
A solution of 17.78 ml (126 mmol) diisopropyl amine in 375 ml THF was cooled to −78° C. A 1.6 M solution of BuLi in hexanes (79 ml, 126 mmol) was added drop wise. After 15 minutes 20 g of 4-bromo-1-fluoro benzene (114 mmol) was added dropwise while keeping the temperature below −60° C. After stirring for 2.5 h at −70° C. 13.22 ml ethyl difluoro acetate were added. The mixture was warmed to −40° C. and then quenched by pouring the mixture onto 1M HCl. The mixture was extracted with ligroine, dried with MgSO4.H2O, concentrated and purified by column chromatography (silica gel; hexane/5-15% TBME) to give the desired product as a yellow liquid. 1H-NMR (CDCl3, 360 MHz): 8.09 (dd, 1H), 7.82-7.77 (m, 1H), 7.17 (t, 1H), 6.45 (t, 1H, CHF2)
b) 1-(5-Bromo-2-fluoro-phenyl)-1-difluoromethyl-allyl]-carbamic acid tert-butyl ester
A mixture of 16 g (63.2 mmol) 1-(5-bromo-2-fluoro-phenyl)-ethanone and 26.3 g (69.6 mmol) N-tert-butyloxycarbonyl-triphenyliminophosphorane were heated at 90° C. in toluene for 18 h. The mixture was triturated with hexane and filtered to remove triphenyl phosphine oxide. The filtrate was purified by chromatography on silica gel (hexane/1-5% TBME) to give 11.37 g (32.3 mmol) of the desired product as a slightly impure yellow oil. TLC: Rf (Hexane/EtOAc 6:1)=0.65.
The product was dissolved in 100 ml THF and cooled to −78° C. Vinylmagnesium bromide (48 ml of a 1M solution in THF) was added dropwise, while the reaction temperature was not allowed to exceed −60° C. The mixture was stirred at −70° C. for 1 h before it was allowed to warm to 0° C. The reaction was quenched with 10% aqueous ammonium chloride and extracted with TBME. The organic layer was washed with brine, treated with activated charcoal and MgSO4.H2O and filtered over celite. The filtrated was concentrated and crystallized from hexane to give the desired product as colorless crystals.
HPLC: RtH1=3.575 min; ESIMS [M+Na]+=402/404(1Br);
1H-NMR (CDCl3, 360 MHz): 7.57 (dd, 1H), 7.51-7.45 (m, 1H), 7.00 (dd, 1H), 6.49 (t, 1H, CHF2), 6.21 (dd, 1H), 5.59 (d, 1H), 5.40 (dd, 1H), 5.25 (br, 1H), 1.40 (br s, 9H).
c) [1-(5-Bromo-2-fluoro-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-carbamic acid tert-butyl ester
A suspension of 10.99 g (28.9 mmol) 1-(5-bromo-2-fluoro-phenyl)-1-difluoromethyl-allyl]-carbamic acid tert-butyl ester and 3.84 g (43.4 mmol) sodium hydrogen carbonate in 200 ml DCM and 80 ml MeOH was cooled to −78° C. A mixture of O3 in oxygen gas was introduced till the blue color persisted. The excess ozone was removed by bubbling through oxygen gas for 10 minutes. NaBH4 (2.187 g, 57.8 mmol) was added as a solid in three portions. The mixture was stirred 10 min at −78° C. and then allowed to warm to 0° C. After 30 min the mixture was poured onto ice-cold 1N HCl and extracted with TBME. The organic phase was washed with 1N HCl, brine, dried with MgSO4.H2O and evaporated. The crude product was crystallized from hexane to give the desired product as colorless crystals.
TLC: Rf (Hexane/EtOAc 4:1)=0.29.
HPLC: RtH1=3.000 min; ESIMS [M+Na]+=406/408(1Br);
1H-NMR (DMSO-d6, 360 MHz): 7.60-7.49 (m, 2H), 7.42 (br s, 1H), 7.180 (dd, 1H), 6.49 (t, 1H, CHF2), 5.27 (br s, 1H), 3.90 (br s, 2H), 1.35 (br s, 9H).
d) N-[1-(5-Bromo-2-fluoro-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-2-chloro-acetamide
A suspension of 10.22 g (26.6 mmol) [1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-carbamic acid tert-butyl ester in 133 ml 4N HCl in dioxane was stirred for two h at rt. The mixture was evaporated to give the hydrochloride salt of 2-amino-2-(5-bromo-2-fluoro-phenyl)-3,3-difluoro-propan-1-ol.
HPLC: RtH3=2.550 min; ESIMS [M+H]+=284, 286(1Br);
The crude product was taken up in 63 ml DCM and 63 ml 10% aqueous soda and stirred vigorously with ice-cooling. A solution of 3.34 ml (42 mmol) chloroacetyl chloride in 10 ml DCM was added dropwise. The ice bath was taken away and stirring was continued for 1 h. The mixture was diluted with TBME and water. The organic phase was dried with MgSO4.H2O and purified via chromatography on silica gel (hexane/25-33% EtOAc) to give the desired product as a slightly impure resin.
HPLC: RtH3=3.336 min; ESIMS [M+H]+=360/362/364 (1Br, 1Cl);
1H-NMR (DMSO-d6, 360 MHz): 8.78 (s, 1H), 7.62-7.53 (m, 2H), 7.19 (dd, 1H), 6.53 (t, 1H, CHF2), 5.43 (t, 1H), 4.27-4.02 (m, 4H).
e) 5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-morpholin-3-one
A solution of 9.59 g (26.2 mmol) N-[1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-2-chloro-acetamide in 134 ml t-butanol was treated with 3.58 g KOtBu. The mixture was heated at reflux for 3 h. After cooling down the mixture was diluted with EtOAc and 1N HCl. The organic phase was washed with brine, dried with MgSO4.H2O, filtered and evaporated. The product was obtained as colorless crystal (TBME/hexane).
TLC: Rf (Hexane/EtOAc 2:1)=0.29.
HPLC: RtH3=2.950 min; ESIMS [M+H]+=324/326(1Br);
1H-NMR (CDCl3, 360 MHz): 7.61-7.55 (m, 2H), 7.09 (dd, 1H), 6.80 (br, 1H), 6.35 (t, 1H, CHF2), 4.37-4.17 (m, 4H).
f) 5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-morpholine-3-thione
A mixture of 7.34 g (22.65 mmol) 5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-morpholin-3-one and 5.19 g (12.46 mmol) Lawesson's reagent in 73 ml of THF was refluxed for 1 h. The mixture was concentrated and crystallized from DCM/hexane and recrystallized from EtOH to yield the desired product as colorless crystals.
HPLC: RtH3=3.370 min; ESIMS [M+H]+=340/342(1Br);
1H-NMR (DMSO-d6, 360 MHz): 11.40 (s, 1H), 7.77-7.70 (m, 1H), 7.63 (dd, 1H), 7.37 (dd, 1H), 6.35 (t, 1H, CHF2), 4.50 (d, 1H), 4.44 (d, 1H), 4.29 (d, 1H), 4.10 (d, 1H).
g) 5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
A solution of 6.14 g (18.05 mmol) 5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-morpholine-3-thione in 77 ml 7M NH3/MeOH was stirred at rt for 6 h. The mixture was evaporated and purified chromatographed on silica gel (DCM/1-5% MeOH followed by DCM/MeOH/aqueous NH3 95:4.5:0.5) to give the desired product as yellowish resin.
HPLC: RtH3=2.477 min; ESIMS [M+H]+=323/325(1Br);
1H-NMR (DMSO-d6, 360 MHz): 7.99 (dd, 1H), 7.62-7.56 (m, 1H), 7.22 (dd, 1H), 6.31 (br, 2H), 6.12 (t, 1H, CHF2), 4.25 (d, 1H), 4.05 (d, 1H), 3.94 (d, 1H), 3.75 (d, 1H).
h) [5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To an ice-cold solution of 6.38 g (19.75 mmol) 5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine in 100 ml THF were added 5.60 g (25.67 mmol) Boc2O and 5.17 ml (29.6 mmol) DIPEA. The mixture was stirred for 4 h at rt. Then the mixture was diluted with TBME and washed with 5% aqueous NaHCO3. The organic phase was dried with MgSO4.H2O, filtered and concentrated. Purification by chromatography on silica gel (hexane/5-20% EtOAc) gave the desired product as a colorless solid.
TLC: Rf (Hexane/EtOAc 9:1)=0.27.
HPLC: RtH1=3.299 min; ESIMS [M+H]+=423/425(1Br);
1H-NMR (CDCl3, 360 MHz): 7.81 (dd, 1H), 7.50-7.44 (m, 1H), 7.00 (dd, 1H), 6.12 (t, 1H, CHF2), 4.83 (d, 1H), 4.60 (d, 1H), 4.37 (dd, 1H), 3.94 (d, 1H), 1.52 (s, 9H).
i) [5-(5-Azido-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To a solution of 7.27 g (17.18 mmol) [5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester and 2.443 g (17.18 mmol) trans-N,N′-dimethylcyclohexane-1,2-diamine in 237 ml EtOH was added a solution of 8.93 g (137 mmol) sodium azide and 1.361 g (6.87 mmol) sodium-ascorbate in 102 ml water. The mixture was degassed and brought under nitrogen atmosphere. CuI (1.309 g, 6.87 mmol) was added and the mixture was heated at 70° C. The initially formed suspension turned into a homogeneous blue solution. The mixture was cooled to rt, diluted with water and TBME. The organic phase was washed with brine and dried with MgSO4.H2O. The crude product was purified by chromatography on silica gel (hexane/5-8% TBME) to give the desired product as a colorless solid.
HPLC: RtH1=3.173 min; ESIMS [M+H]+=386;
1H-NMR (CDCl3, 360 MHz, signals broadened due to rotamers): 7.39-7.44 (m, 1H), 7.15-7.06 (m, 1H), 7.05-6.98 (m, 1H), 6.14 (t, 1H, CHF2), 4.80 (d, 1H), 4.60 (d, 1H), 4.39 (d, 1H), 3.97 (d, 1H), 1.52 (s, 9H).
j) [5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A solution of 4.89 g (12.69 mmol) [5-(5-azido-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester in 64 ml EtOH and 17 ml THF was treated with 1.1 g 10% Pd—C and stirred under an atmosphere of hydrogen until the starting material had been consumed. The mixture was diluted with DCM and filtered over celite. The product was purified by chromatography on silica gel (hexane/25-50% EtOAc) to give the desired product as colorless foam.
HPLC: RtH3=2.778 min; ESIMS [M+H]+=360;
1H-NMR (CDCl3, 360 MHz, spectrum not interpretable due to rotamers): 7.1-6.1 (m,  ̃4H), 5.0-4.9 (m,  ̃4H), 1.52 (br s, 9H).
k) (5-{5-[(5-Bromo-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
To a solution of 325 mg (0.952 mmol) [5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester, 212 mg (1.047 mmol) 5-bromo-pyridine-2-carboxylic acid, 168 mg (1.238 mmol) HOAt and 0.34 ml (2.38 mmol) Et3N in 5 ml DCM were added 237 mg (1.24 mmol) EDC.HCl. The mixture was stirred overnight. The mixture was diluted with EtOAc and washed with water, 1N HCl, brine and 5% aqueous NaHCO3. The organic phase was dried with MgSO4.H2O, filtered and purified by chromatography on silica gel (hexane/14-18% EtOAc) to give the desired product as colorless foam.
TLC: Rf (Hexane/EtOAc 3:1)=0.35.
HPLC: RtH1=3.127 min; ESIMS [M+H]+=525/527(1Br);
1H-NMR (CDCl3, 360 MHz): 9.90 (br s, 1H), 8.72 (d, 1H), 8.23 (d, 1H), 8.09 (dd, 1H), 7.94-7.86 (m, 2H), 7.47 (t, 1H), 7.38-7.28 (m, 3H), 5.92 (t, 1H, CHF2), 4.87 (d, 1H), 4.67 (d, 1H), 4.6-4.45 (br, 1H), 4.34 (d, 1H), 4.00 (d, 1H), 1.56 (br s, 9H).
l) 5-Bromo-pyridine-2-carboxylic acid [3-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
A solution of 100 mg (0.184 mmol) (5-{5-[(5-bromo-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester in 1.4 ml 4N HCl in dioxane was stirred at 50° C. After 15 min 0.3 ml 3N HCl in MeOH were added and the now homogeneous solution was stirred for 3 h. The mixture was concentrated and crystallized from EtOH/TBME to yield the title compound.
HPLC: RtH3=2.857 min; ESIMS [M+H]+=443/445;
1H-NMR (600 MHz, DMSO-d6): δ 10.93 (s, 1H), 9.78 (s, 1H), 8.89 (s, 1H), 8.77 (s, 1H), 8.35 (d, 1H), 8.11-8-06 (m, 3H), 7.39 (t, 1H), 6.79 (t, 1H, CHF2), 4.70 (d, 1H), 4.64 (d, 1H), 4.34 (d, 1H), 4.17 (d, 1H).
Examples 43 to 49
The compounds listed in Table 4 were prepared by a procedure analogous to that used in example 42.
For enantiomerically pure compounds the racemic precursor [5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (example 42j)) was separated via prep-HPLC on Chiralpak AD-H 250×4.6 mm column using supercritical CO2/EtOH 9:1 as an eluent. The desired compound was the slower eluting (R)-enantiomer. Enantiomeric excess=99.7%; [α]D=−109.7° (c=1, CHCl3).










TABLE 4








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







43




10.95 (s, 1H), 9.77 (s, 1H), 8.80 (s and s, 2H), 8.22 (dd, 1H), 8.17 (d, 1H), 8.10-8.06 (m, 2H), 7.39 (t, 1H), 6.78 (t, 1H, CHF2), 4.72 (d, 1H), 4.65 (d, 1H), 4.32 (d, 1H), 4.18 (d, 1H).
399



5-Chloro-pyridine-2-carboxylic





acid [3-(5-amino-3-difluoromethyl-





3,6-dihydro-2H-[1,4]oxazin-3-yl)-





4-fluoro-phenyl]-amide




 


44




10.78 (s, 1H), 9.78 (s, 1H), 8.78 (s, 1H), 8.62 (s, 1H), 8.01-7.94 (m, 2H), 7.39 (dd, 1H), 6.78 (t, 1H, CHF2), 4.72 (d, 1H), 4.68 (d, 1H), 4.39 (d, 1H), 4.21 (d, 1H).
413



5-Chloro-3-methyl-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-





amide hydrochloride




 


45




10.64 (s, 1H), 9.78 (s, 1H), 8.67 (s, 1H), 8.19 (s, 1H), 8.01-7.94 (m, 2H), 7.38 (dd, 1H), 6.78 (t, 1H, CHF2),  4.75 (d, 1H), 4.65 (d, 1H),  4.34 (d, 1H), 4.17 (d, 1H).
457



5-Bromo-3-methyl-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-





amide hydrochloride




 


46




11.05 (s, 1H), 9.74 (s, 1H), 9.08 (s, 1H), 8.80 (s, 1H), 8.74 (s, 1H), 8.90-8.84 (m, 2H), 7.41 (dd, 1H), 6.78 (t, 1H, CHF2), 4.69 (d, 1H), 4.64 (d, 1H), 4.35 (d, 1H), 4.17 (d, 1H).
467



3-Chloro-5-trifluoromethyl-





pyridine-2-carboxylic acid [3-((R)-





5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide





hydrochloride




 


47




11.02 (s, 1H), 9.75 (s, 1H), 9.15 (s, 1H), 8.74 (s, 1H), 8.52 (d, 1H), 8.34 (d, 1H), 8.12-8.06 (m, 2H), 7.40 (dd, 1H), 6.78 (t, 1H, CHF2),  4.70 (d, 1H), 4.60 (d, 1H), 4.31 (d, 1H), 4.18 (d, 1H). 
433



5-Trifluoromethyl-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-





amide hydrochloride




 


48




11.00 (s, 1H), 10.95 (s, 1H), 9.73 (s, 1H), 9.17 (s, 1H), 8.73  (d and d, 2H), 8.14-8.10 (m, 1H), 8.08-8.03 (m, 1H), 7.40 (dd, 1H), 6.78 (t, 1H, CHF2), 4.70 (d, 1H), 4.65 (d, 1H), 4.32 (d, 1H), 4.18 (d, 1H), 2.56 (s, 3H).
380



5-Methyl-pyrazine-2-carboxylic





acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-





amide hydrochloride




 


49




10.99 (s, 1H), 10.74 (s, 1H), 9.75 (s, 1H), 8.71 (s, 1H), 8.39 (s, 1H), 8.15 (d, 1H), 8.10-8.14 (m, 2H), 7.40 (dd, 1H), 7.64 (d, 1H), 6.37 (dd, 1H), 6.78 (t, 1H, CHF2), 4.72 (d, 1H), 4.63 (d, 1H),  4.33 (d, 1H), 4.17 (d, 1H), 3.44 (s, 3H).
395



5-Methoxy-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-





amide hydrochloride









Example 50
5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




a) 2-(3-Bromo-phenyl)-2-tert-butoxycarbonylamino-3,3,3-trifluoro-propionic acid ethyl ester
A solution of 5.66 g (20 mmol) 1-bromo-3-iodo-benzene in 25 ml THF was stirred at −20° C. A 1.82 M solution of isopropylmagnesium chloride (12.1 ml, 22.0 mmol) in THF was added and the mixture was stirred 1 h at 0° C. The mixture was cooled to −78° C. and a solution of 5.38 g (20 mmol) 2-[(E)-tert-butoxycarbonylimino]-3,3,3-trifluoro-propionic acid ethyl ester in 50 ml of THF was added over a period of 2 h. After 20 min the mixture was quenched with 5% aqueous NH4Cl. The mixture was extracted with TBME. The organic phase was dried with Na2SO4, filtered and evaporated. Purification via chromatography on silica gel (c-hexane/0-14% EtOAc) gave the desired product as a colorless resin.
TLC: Rf (Hexane/EtOAc 6:1)=0.37.
HPLC: RtH1=3.704 min; ESIMS [M+Na]+=448/450(1Br);
1H-NMR (CDCl3, 360 MHz): 7.69 (s, 1H), 7.57 (d, 1H), 7.49 (d, 1H), 7.31 (t, 1H), 5.70 (br s, 1H), 4.37 (q, 2H), 1.42 (br s, 9H), 1.30 (t, 3H).
b) [1-(3-Bromo-phenyl)-2,2,2-trifluoro-1-hydroxymethyl-ethyl]-carbamic acid tert-butyl ester
To an at −7° C. stirred solution of 5 g (11.73 mmol) 2-(3-bromo-phenyl)-2-tert-butoxycarbonylamino-3,3,3-trifluoro-propionic acid ethyl ester in 50 ml toluene were added 58.7 ml of a 1.7M solution of DibalH in toluene. The mixture was stirred overnight at rt and quenched with an aqueous tartaric acid solution. The mixture was extracted with EtOAc and the organic phase was washed with brine, dried with MgSO4.H2O and evaporated. Purification via chromatography on silica gel (c-hexane/15-50% TBME) gave the desired product as a colorless resin.
TLC: Rf (Hexane/EtOAc 3:1)=0.35
HPLC: RtH1=3.155 min; ESIMS [M+Na]+=406/408(1Br);
1H-NMR (CDCl3, 360 MHz): 7.54 (s, 1H), 7.45 (d, 1H), 7.35 (d, 1H), 7.23 (t, 1H), 5.38 (s, 1H), 4.28-4.12 (m, 3H), 1.38 (br s, 9H).
c) [2-(3-Bromo-phenyl)-2-tert-butoxycarbonylamino-3,3,3-trifluoro-propoxy]-acetic acid ethyl ester
With the use of a syringe pump a solution of 1.87 ml (15.17 mmol) ethyl diazoacetate in 8 ml DCM were added to a stirred solution of 2.01 g (5.23 mmol) [1-(3-bromo-phenyl)-2,2,2-trifluoro-1-hydroxymethyl-ethyl]-carbamic acid tert-butyl ester and 46 mg (0.105 mmol) Rh2(OAc)2 in 34 ml DCM over a period of 3.5 h. After 30 min the mixture was evaporated and chromatographed on silica gel (c-hexane/0-20% TBME) to give the desired product contaminated with a diazo ester oligomer.
HPLC: RtH1=3.752 min; ESIMS [M+Na]+=492/494(1Br);
1H-NMR (CDCl3, 360 MHz): 7.67 (s, 1H), 7.51 (d, 1H), 7.46 (d, 1H), 7.28 (t, 1H), 6.28 (s, impurity), 6.05 (br s, 1H), 4.35-4.10 (m, 5H), 3.85 (br, 1H), 1.40 (br s, 9H), 1.35 (t, 3H).
d) [2-Amino-2-(3-bromo-phenyl)-3,3,3-trifluoro-propoxy]-acetic acid ethyl ester
A solution of 1.4 g (2.47 mmol) [2-(3-bromo-phenyl)-2-tert-butoxycarbonylamino-3,3,3-trifluoro-propoxy]-acetic acid ethyl ester in 5 ml DCM was treated with 3.74 ml 4N HCl/dioxane. After standing overnight the mixture was evaporated, taken up in EtOAc and washed with 10% aqueous NaHCO3. The organic phase was washed with brine, dried with Na2SO4 and purified via chromatography on silica gel (c-hexane/10-15% EtOAc) to give the desired product as a colorless resin.
TLC: Rf (Hexane/EtOAc 3:1)=0.30.
HPLC: RtH1=2.316 min; ESIMS [M+H]+=370/372(1Br);
1H-NMR (CDCl3, 360 MHz): 7.77 (s, 1H), 7.51 (d, 1H), 7.43 (d, 1H), 7.19 (t, 1H), 4.16 (q, 2H), 4.05 (s, 2H), 3.98 (d, 1H), 3.79 (d, 1H), 1.21 (t, 3H).
e) 5-(3-Bromo-phenyl)-5-trifluoromethyl-morpholin-3-one
A solution of 598 mg (1.616 mmol) [2-Amino-2-(3-bromo-phenyl)-3,3,3-trifluoro-propoxy]-acetic acid ethyl ester in 5.4 ml toluene and 2.7 ml TFA was heated at reflux temperature for 5 h. The cooled down mixture was evaporated, taken up in EtOAc, washed with 5% aqueous NaHCO3, dried with Na2SO4 and evaporated to give the essentially pure title compound as a colorless solid.
TLC: Rf (Hexane/EtOAc 3:1)=0.13.
HPLC: RtH1=2.099 min; ESIMS [M+H]+=324/326(1Br);
1H-NMR (CDCl3, 360 MHz): 7.68 (s, 1H), 7.63 (d, 1H), 7.48 (d, 1H), 7.39 (t, 1H), 6.70 (br s, 1H), 4.41 (d, 1H), 4.38 (d, 1H), 4.25 (d, 1H), 3.95 (d, 1H).
f) [5-(3-Amino-phenyl)-5-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
The title compound was obtained by methods described for the conversions of 42e) to 42j).
TLC: Rf (Hexane/EtOAc 1:1)=0.16.
HPLC: RtH4=2.214 min; ESIMS [M+H]+=360;
1H-NMR (CD3OD, 360 MHz): 7.00 (t, 1H), 6.86 (s, 1H), 6.78 (d, 1H), 6.60 (d, 1H), 4.52 (d, 1H), 4.40 (d, 1H), 4.03 (d, 1H), 3.88 (d, 1H).
g) (5-{5-[(5-Chloro-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
To a solution of 56 mg (0.156 mmol) [5-(3-amino-phenyl)-5-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester, 27 mg (0.171 mmol) 5-chloro-pyridine-2-carboxylic acid, 27.6 mg (0.203 mmol) HOAt and 0.054 ml (0.39 mmol) Et3N in 1 ml DCM were added 33 mg (0.171 mmol) EDC.HCl. After 18 h the mixture was diluted with EtOAc, washed with water, 1N HCl, brine and 5% aqueous NaHCO3. The organic phase was dried with MgSO4.H2O, filtered and purified by chromatography on silica gel (hexane/14-18% EtOAc) to give the desired product as colorless foam.
TLC: Rf (Hexane/EtOAc 3:1)=0.34.
HPLC: RtH4=2.871 min; ESIMS [M+Na]+=521/523(1Cl);
1H-NMR (CDCl3, 360 MHz): 8.51 (d, 1H), 8.19 (d, 1H), 7.85-7.80 (m, 3H), 7.36 (t, 1H), 7.25 (d, 1H), 4.68 (d, 1H), 4.57 (d, 1H), 4.15 (d, 1H), 4.03 (d, 1H), 1.50 (br s, 9H).
h) 5-Chloro-pyridine-2-carboxylic acid [3-(5-amino-3-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
A solution of 68 mg (0.136 mmol) (5-{5-[(5-chloro-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester in 2 ml 4N HCl in dioxane was stirred at 40° C. overnight. The mixture was concentrated and crystallized from EtOAc/hexane to yield the title compound as colorless crystals.
HPLC: RtH3=2.927 min; ESIMS [M+H]+=399/401(1Cl);
1H-NMR (400 MHz, DMSO-d6): δ 10.60 (s, 1H), 8.19 (dd, 1H), 8.14 (d, 1H), 8.10 (s, 1H), 7.87 (d, 1H), 7.38 (d, 1H), 7.33 (d, 1H), 6.27 (br s, 1H), 4.12 (d, 1H), 4.04 (d, 1H), 3.94 (d, 1H), 3.93 (d, 1H).
Example 51
5-Bromo-pyrimidine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide hydrochloride




a) 1-(3-Bromo-5-nitro-phenyl)-ethanol
A solution of TiCl4 (9.48 g, 50 mmol) and methylmagnesiumbromide (20.80 ml, 52 mmol, 2.5 M solution in THF) in THF (400 ml) was stirred at −30° C. when 3-bromo-5-nitro-benzaldehyde (9.20 g, 40 mmol) was added as solid. The mixture was stirred for 1 h at −30° C. As the reaction was not complete, the reaction was cooled to −78° C. and 0.65 eq. methylmagnesium bromide and 0.625 eq. TiCl4 were added and stirring was continued at −30° C. This procedure was repeated again to add 0.325 eq. methylmagnesium bromide and 0.313 eq. TiCl4. After complete conversion the reaction was cooled to −78° C. and quenched by addition of 500 ml cold water. 500 ml dichloromethane were added and the reaction was allowed to warm to r.t. The phases were separated and the aqueous phase was extracted twice with dichloromethane. The organic phases were washed with water and brine, combined and dried over Na2SO4. Volatiles were removed under reduced pressure. The crude product was purified by automated column chromatography (cyclohexane/ethyl acetate) yielding the title compound as yellowish oil. 1H-NMR (360 MHz, CDCl3): 8.20 (s, 1H), 8.10 (s, 1H), 7.78 (s, 1H), 4.95 (q, 1H), 1.45 (d, 3H).
b) 1-(3-Bromo-5-nitro-phenyl)-ethanone
1-(3-Bromo-5-nitro-phenyl)-ethanol (12.84 g, 52.2 mmol) was dissolved in dioxane (245 ml) and manganedioxide (31.8 g, 365 mmol) was added. The reaction was refluxed for 17 hrs. The reaction was filtered and solvent was removed under reduced pressure yielding the title compound as yellow solid. 1H-NMR (500 MHz, DMSO-d6): 8.64 (s, 1H), 8.58 (s, 1H), 8.53 (s, 1H), 2.70 (s, 3H); GC/MS: 243 [(M)+].
c) 2-Methyl-propane-2-sulfinic acid [1-(3-bromo-5-nitro-phenyl)-eth-(E)-ylidene]-amide
1-(3-Bromo-5-nitro-phenyl)-ethanone (11.6 g, 47.5 mmol), (R)-(+)-tert-butanesulfinamide (6.34 g, 52.3 mmol) and Ti(OEt)4 (24.64 ml, 119 mmol) were mixed in 62 ml THF and refluxed for 2.5 hrs. The reaction was cooled and carefully quenched by addition of ice and water. The white precipitate was filtered off and the aqueous mixture was extracted with ethyl acetate. The organic phases were washed with water and brine, combined and dried over Na2SO4. Volatiles were removed under reduced pressure. The crude product was purified by automated column chromatography (cyclohexane/ethyl acetate) yielding the title compound as yellow oil. 1H-NMR (500 MHz, DMSO-d6): 8.58 (s, 1H), 8.55 (s, 1H), 8.43 (s, 1H), 2.79 (s, 3H), 1.24 (s, 9H); MS: 347 [(M+H)+]; [α]D=+54.5° (c=0.481% in chloroform).
d) 2-Methyl-propane-2-sulfinic acid [(R)-(3-bromo-5-nitro-phenyl)-cyano-methyl-methyl]-amide
The sulfoxiimine from the previous step (12.48 g, 35.9 mmol) and CsF (6.01 g, 39.5 mmol) were dissolved in hexane (287 ml) and THF (72 ml) and cooled to −50° C. TMSCN (3.92 g, 39.5 mmol) were added dropwise and the reaction was stirred at 0° C. for 4 h. The reaction was cooled to −78° C. and quenched by addition of 720 ml saturated NH4Cl solution. The product was extracted with ethyl acetate. The organic phases were washed with water and brine, combined and dried over Na2SO4. Volatiles were removed under reduced pressure. The crude product was purified by automated column chromatography (cyclohexane/ethyl acetate) yielding the title compound as tan solid. 1H-NMR (500 MHz, CDCl3): 8.43 (s, 2H), 8.13 (s, 1H), 4.19 (s, NH, 1H), 2.05 (s, 3H), 1.30 (s, 9H); MS: 374 [(M+H)+]; [α]D=+3.2° (c=0.497% in chloroform)
e) (R)-2-Amino-2-(3-bromo-5-nitro-phenyl)-propionic acid hydrochloride
2-Methyl-propane-2-sulfinic acid [(R)-(3-bromo-5-nitro-phenyl)-cyano-methyl-methyl]-amide (4.87 g, 13.0 mmol) was suspended in 215 ml conc. HCl (12.1 M) and refluxed for 4 hrs. Toluene was added twice and volatiles were removed under reduced pressure yielding a off-white solid. 1H-NMR (360 MHz, MeOD): 8.60 (s, 1H), 8.44 (s, 1H), 8.18 (s, 1H), 2.05 (s, 3H); MS: 289 [(M+H)+].
f) (R)-2-Amino-2-(3-bromo-5-nitro-phenyl)-propan-1-ol
(R)-2-Amino-2-(3-bromo-5-nitro-phenyl)-propionic acid (8.41 g, 25.8 mmol) was suspended in abs. THF (39 ml) and cooled to 0° C. BH3 in THF (103 ml, 103 mmol, 1M in THF) was added and the reaction was stirred at r.t. for 1 hr. The reaction was poured onto NaHCO3 (solid, 26 g, 12 eq.), 78 g ice and 155 ml ethyl acetate and stirred for 20 min. at r.t. Phases were separated. The organic phases were washed with water and brine, combined and dried over Na2SO4. Volatiles were removed under reduced pressure yielding the title compound as brown oil. 1H-NMR (360 MHz, DMSO-d6): 8.40 (s, 1H), 8.25 (s, 1H), 8.18 (s, 1H), 4.95 (t, 1H), 3.55 (m, 1H), 3.38 (m, 1H), 1.33 (s, 3H); MS: 275 [(M+H)+].
g) N—[(R)-1-(3-Bromo-5-nitro-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide
(R)-2-Amino-2-(3-bromo-5-nitro-phenyl)-propan-1-ol (6.27 g, 22.79 mmol) was dissolved in DMF (230 ml) under N2 and K2CO3 (7.87 g, 57 mmol) and DIPEA (3.98 ml, 22.79 mmol) were added. The mixture was cooled to 0° C. and chloro-acetylchloride (2.83 g, 25.07 mmol) was added dropwise. The reaction was stirred at 0° C. for 19 hrs. After completion, the reaction was put between water (2.3 liter) and toluene (2.3 l). The organic phases were washed with water and brine, combined and dried over Na2SO4. Volatiles were removed under reduced pressure. The crude product was purified by automated column chromatography (cyclohexane/ethyl acetate) yielding the title compound as colorless oil. 1H-NMR (360 MHz, DMSO-d6): 8.51 (1H, NH), 8.28 (s, 1H), 8.12 (s, 1H), 7.93 (s, 1H), 5.25 (t, 1H), 4.15 (d, 2H), 3.62 (m, 2H), 1.62 (s, 3H); MS: 351 [(M+H)+].
h) (R)-5-(3-Bromo-5-nitro-phenyl)-5-methyl-morpholin-3-one
N—[(R)-1-(3-Bromo-5-nitro-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide (4.45 g, 10.76 mmol) and KOtBu (2.414 g, 21.52 g) were suspended in 55 ml tert-butanol under N2 and heated 100° C. for 30 min. After completion water was added to the reaction and tert-butanol was removed under reduced pressure. The product was extracted with ethyl acetate from the remaining aqueous phase. The organic phases were washed with water and brine, combined and dried over Na2SO4. Volatiles were removed under reduced pressure. The crude product was purified by automated column chromatography (cyclohexane/ethyl acetate) yielding the title compound as tan solid. 1H-NMR (360 MHz, DMSO-d6): 8.88 (1H, NH), 8.35 (s, 1H), 8.28 (s, 1H), 8.14 (s, 1H), 4.16 (m, 1H), 4.06 (s, 2H), 3.74 (m, 1H), 1.50 (s, 3H); MS: 316 [(M+H)+].
i) (R)-5-(3-Bromo-5-nitro-phenyl)-5-methyl-morpholine-3-thione
(R)-5-(3-Bromo-5-nitro-phenyl)-5-methyl-morpholin-3-one (2.60 g, 7.84 mmol) and Lawesson's reagent (2.54 g, 6.27 mmol) were stirred at 80° C. for 2 hrs. Volatiles were removed under reduced pressure and the crude product mixture was purified by automated column chromatography (cyclohexane/ethyl acetate) yielding the title compound as yellow foam. 1H-NMR (360 MHz, DMSO-d6): 11.28 (1H, NH), 8.38 (s, 1H), 8.22 (s, 1H), 8.17 (s, 1H), 4.44 (m, 1H), 4.22 (d, 1H), 3.81 (m, 1H), 1.60 (s, 3H); MS: 331 [(M+H)+].
j) (R)-5-(3-Bromo-5-nitro-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
(R)-5-(3-Bromo-5-nitro-phenyl)-5-methyl-morpholine-3-thione (2.86 g, 7.77 mmol) was dissolved in 7M NH3 in methanol (50 ml). Tert-Butylhydroperoxide (9.41 ml, 78 mmol) and ammonia hydroxide (25% sol., 21.2 ml, 136 mmol) were added and the reaction was stirred at r.t. for 2 hrs. Upon completion, 50 ml half-saturated Na2S2O3 solution was added to the reaction and the product was extracted with ethyl acetate. The organic phases were washed with water and brine, combined and dried over Na2SO4. Volatiles were removed under reduced pressure, yielding the title compound as yellowish solid. 1H-NMR (360 MHz, DMSO-d6): 8.34 (s, 1H), 8.25 (s, 1H), 8.12 (s, 1H), 5.85 (br, 2H), 4.01 (m, 1H), 3.80 (m, 1H), 3.55 (m, 1H), 1.38 (s, 3H); MS: 314 [(M+H)+].
k) [(R)-5-(3-Bromo-5-nitro-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
(R)-5-(3-Bromo-5-nitro-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (1.74 g, 5.10 mmol) was dissolved in 40 ml dichloromethane under N2 and cooled to 0° C. Boc2O (1.45 g, 6.63 mmol) and DIPEA (1.34 ml, 7.65 mmol) were added and the reaction was stirred at r.t for 18 hrs. 100 ml water was added to the reaction. The organic phases were washed with water and brine, combined and dried over Na2SO4. Volatiles were removed under reduced pressure. The crude product was purified by automated column chromatography (cyclohexane/ethyl acetate) yielding the title compound as white foam. 1H-NMR (360 MHz, DMSO-d6): 9.76 (s, 1H, NH), 8.32 (s, 1H), 8.27 (s, 1H), 8.17 (s, 1H), 4.60 (d, 1H), 4.38 (d, 1H), 3.94 (d, 1H), 3.48 (d, 1), 1.44 (s, 9H), 1.38 (s, 3H); MS: 414 [(M+H)+].
l) [(R)-5-(3-Amino-5-bromo-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
[(R)-5-(3-Bromo-5-nitro-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (930 mg, 2.13 mmol) was dissolved in 5 ml methanol. Raney-Nickel was added and the reaction was hydrogenated for 1.5 hrs at r.t. The reaction was filtered over Celite, washed with dichloromethane/methanol (9/1). Volatiles were removed under reduced pressure yielding the title compound as white solid.
1H-NMR (360 MHz, DMSO-d6): 9.60 (br, 1H), 6.72 (s, 1H), 6.64 (s, 1H), 6.55 (s, 1H), 5.40 (br, 2H), 4.38 (m, 2H), 3.65 (m, 2H), 1.44 (s, 12H); MS: 384 [(M+H)+]; [α]D=−172.9° (c=0.441% in methanol)
m) ((R)-5-{3-Bromo-5-[(5-bromo-pyrimidine-2-carbonyl)-amino]-phenyl}-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
[(R)-5-(3-Amino-5-bromo-phenyl)-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (33 mg, 0.082 mmol), 5-bromo-pyrimidine-2-carboxylic acid (18 mg, 0.090 mmol) and HOBT (16 mg, 0.106 mmol) were dissolved in dichloromethane under N2 at 0° C. DIPEA (10.54 mg, 0.082 mmol) and EDC (17 mg, 0.090 mmol) were added. The mixture was stirred at 0° C. for 10 min, then allowed to warm to room temperature, stirred for 17 h at room temperature, quenched with 1M aqueous KHCO3 solution and extracted with dichloromethane. The organic phase was washed with water and brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by automated column chromatography (cyclohexane/ethyl acetate) to yield the title compound as a tan foam. MS: 569 [(M+H)+].
n) 5-Bromo-pyrimidine-2-carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide hydrochloride
A solution of ((R)-5-{3-bromo-5-[(5-bromo-pyrimidine-2-carbonyl)-amino]-phenyl}-5-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (22 mg, 0.039 mmol) in 4 M HCl in dioxane (0.8 ml, 80 eq.) was warmed to 40° C. for 24 hrs in a closed reaction vial. After completion volatiles were removed under reduced pressure to yield the title compound (hydrochloride salt) in the form of a colourless solid. 1H-NMR (500 MHz, DMSO-d6): 11.05 (s, 1H), 10.61 (s, 1H, NH+), 9.25 (s, 2H), 9.19 (s, 1H), 8.58 (s, 1H), 8.26 (s, 1H), 7.89 (s, 1H), 7.44 (s, 1H), 4.59 (m, 2H), 3.91 (m, 2H), 1.63 (s, 3H); MS: 470 [(M+H)+].
Examples 52 to 59
The compounds listed in Table 5 were prepared by a procedure analogous to that used in example 51.










TABLE 5








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







52




10.45 (s, 1H), 8.88 (s, 1H), 8.35 (m, 1H), 8.17 (d, 1H), 8.07 (m, 1H), 7.93 (s, 1H), 7.68 (m, 2H), 7.40 (s, 1H),  4.55 (m, 2H), 4.15 (m, 2H), 1.60 (s, 3H)  
467



5-Bromo-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-5-bromo-phenyl]-amide hydrochloride




 


53




11.02 (s, 1H), 10.55 (s, 1H), 8.65 (s, 1H), 8.56 (m, 1H), 8.31 (s, 1H), 8.27 (m, 1H), 7.96 (s, 1H), 7.40 (s, 1H),  4.55 (m, 2H), 3.90 (m, 2H), 1.60 (s, 3H) 
414



5-Cyano-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-5-bromo-phenyl]-amide hydrochloride




 


54




free base: 10.95 (s, 1H), 9.15 (s, 1H), 8.53 (m, 1H), 8.36 (m, 1H), 8.18 (s, 1H), 7.92 (s, 1H), 7.44 (s, 1H), 6.15 (br, 2H), 4.10 (m, 2H), 3.60 (m, 2H), 1.42 (s, 3H) 
457



5-Trifluoromethyl-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide hydrochloride




 


55




10.80 (s, 1H), 8.69 (s, 1H), 8.22 (m, 2H), 7.81 (s, 1H), 7.42 (s, 1H), 4.55 (br, 2H),  3.90 (m, 2H), 2.58 (s, 3H), 1.62 (s, 3H)
481



5-Bromo-3-methyl-pyridine-2-carboxylic acid 





[3-((R)-5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-5-bromo-phenyl]-amide hydrochloride




 


56




10.90 (s, 1H), 8.82 (s, 1H), 8.30 (s, 1H), 8.25 (m, 1H), 8.18 (m, 1H), 7.96 (s, 1H), 7.42 (m, 2H), 4.55 (m, 2H), 3.90 (m, 2H), 1.63 (s, 3H)
423



5-Chloro-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-5-bromo-phenyl]-amide hydrochloride




 


57




10.90 (s, 1H), 10.50 (br, 1H), 9.20 (s, 1H), 8.75 (s, 1H), 8.30 (s, 1H), 8.01 (s, 1H), 7.43 (s, 1H), 4.55 (m, 2H), 3.90 (m, 2H), 1.63 (s, 3H)
405



5-Methyl-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-5-bromo-phenyl]-amide hydrochloride




 


58




10.22 (s, 1H), 8.22 (s, 1H), 7.86 (s, 1H), 7.38 (s, 1H), 4.54 (m, 2H), 3.85 (m, 2H), 2.61 (s, 3H), 2.45 (s, 3H), 1.61 (s, 3H)
406



2,5-Dimethyl-oxazole-4-carboxylic acid 





[3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-5-bromo-phenyl]-amide hydrochloride




 


59




10.40 (s, 1H), 8.71 (s, 1H), 8.21 (s, 1H), 7.89 (s, 1H), 7.38 (s, 1H), 4.52 (m, 2H), 3.86 (m, 2H), 3.27 (s, 3H), 1.59 (s, 3H)
392



2-Methyl-oxazole-4-carboxylic acid





[3-((R)-5-amino-3-methyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-5-bromo-phenyl]-amide hydrochloride









Examples 60 to 65
The compounds listed in Table 6 were prepared by procedures analogous to those used in examples 51 (steps c) and b)) and 1 (steps c) to l)). 5-bromo-2-fluoro-benzaldehyde was used instead of 3-bromo-5-nitro-benzaldehyde.










TABLE 6








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







60




10.85 (s, 1H), 10.20 (br, 1H), 8.88 (s, 1H), 8.35 (m, 1H), 8.09 (d, 1H), 7.95 (m, 2H), 7.26 (t, 1H), 4.52 (m, 2H), 4.10 (m, 1H), 3.85 (m, 1H), 1.60 (s, 3H)
407



5-Bromo-pyridine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


61




10.85 (s, 1H), 10.25 (br, 1H), 9.30 (br, 1H), 9.15 (s, 1H), 8.72 (s, 1H), 8.58 (br, 1H), 8.00 (m, 2H), 7.28 (m, 1H), 4.55 (m, 2H), 4.12 (m, 1H), 3.88 (m, 1H), 1.62 (s, 3H)
344



5-Methyl-pyrazine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


62




11.02 (s, 1H), 10.70 (br, 1H), 9.20 (s, 1H), 8.59 (m, 1H), 8.31 (d, 1H), 7.98 (m, 2H), 7.27 (t, 1H), 4.52 (m, 2H), 4.06 (m, 1H), 3.87 (m, 1H), 1.64 (s, 3H)
354



5-Cyano-pyridine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


63




10.95 (s, 1H), 10.80 (s, 1H), 9.32 (s, 1H), 8.80 (s, 1H), 8.62 (s, 1H), 8.20 (m, 1H), 8.14 (m, 1H), 8.03 (m, 1H), 7.95 (m, 1H), 7.26 (m, 1H), 4.58 (m, 2H), 4.12 (m, 1H), 3.88 (m, 1H), 1.67 (s, 3H)
363



5-Chloro-pyridine-2-carboxylic acid [3-(5-





amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


64




10.75 (s, 1H), 10.72 (s, 1H),  9.30 (s, 1H), 8.66 (s, 1H), 8.63 (s, 1H), 8.18 (s, 1H), 7.94 (m, 1H), 7.81 (m, 1H), 7.28 (dd,  1H), 4.55 (m, 2H(AB-system)), 4.0 (m, 2H(AB-system)), 2.55 (s, 3H), 1.65 (s, 3H)
421



5-Bromo-3-methyl-pyridine-2-carboxylic





acid [3-(5-amino-3-methyl-3,6-dihydro-





2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


65




10.95 (s, 1H), 10.75 (s, 1H), 9.27 (s, 1H), 9.15 (s, 1H), 8.64 (s, 1H), 8.46 (m, 1H), 8.37 (m, 1H), 8.22 (m, 1H), 8.05 (m, 1H), 7.97 (m, 1H), 7.80 (s, 1H), 7.26 (m, 1H), 4.58 (m, 1H), 4.12 (m, 1H), 3.89 (m, 1H), 1.67 (s, 3H)
372



Pyridine-2,5-dicarboxylic acid 5-amide 2-





{[3-(5-amino-3-methyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide} hydrochloride









Example 66
5-Bromo-pyridine-2-carboxylic acid [34(3R*,6R*)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




a) 2-[2-(3-Bromo-phenyl)-2-oxo-ethoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester
To a solution of 3,3,3-trifluoro-2-hydroxy-2-methyl-propionic acid methyl ester (22.94 g, 133 mmol) in CH2Cl2 (400 ml) was added rhodium(II) trifluoroacetate dimer (0.439 g, 0.667 mmol). After cooling to 0° C. a solution of 1-(3-bromo-phenyl)-2-diazo-ethanone (15.0 g, 66.7 mmol) dissolved in CH2Cl2 (100 ml) was added over a period of 2 h. The reaction mixture was concentrated and the title compound was obtained after flash-chromatography on silica gel (toluene) as a yellow oil: TLC (toluene/EtOAc 10:1): Rf=0.45; HPLC RtH5=1.352 min; 1H NMR (360 MHz, CDCl3): δ 8.15 (s, 1H), 7.94 (d, 1H), 7.76 (d, 1H), 7.40 (t, 1H), 4.87 (s, 2H), 3.89 (s, 3H), 1.72 (s, 3H); ESIMS: 386, 388 [(M+NH4)+].
b) 2-[2-(3-Bromo-phenyl)-2-hydroxy-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester
To a solution of 2-[2-(3-bromo-phenyl)-2-oxo-ethoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester (6.6 g, 17 mmol) in toluene (120 ml) was added under argon at −78° C. a 2M solution of AlMe3 in heptane (17 ml, 34 mmol) and after stirring for 0.5 h at −78° C. a 1.6 M solution of MeLi in Et2O (21.3 ml, 34 mmol) over a period of 40 min. After stirring for 0.5 h at −78° C. the reaction mixture was added to a cold aqueous NaH2PO4 solution and was extracted with EtOAc. Combined organic layers were washed with brine, dried over MgSO4, filtered and evaporated. The crude product was purified by flash-chromatography on silica gel (toluene to toluene/EtOAc 10:1) to provide a diastereomeric mixture of the title compound as a yellow oil: TLC (toluene/EtOAc 10:1): Rf=0.34 and 0.37; HPLC RtH5=1.359 min; 1H NMR (360 MHz, CDCl3): δ 7.69 (m, 1H), 7.43 (m, 2H), 7.25 (t, 1H), 3.86 (s, 3H), 3.68 (m, 2H), 3.43 and 3.33 (s, 1H), 1.63 and 1.61 (s, 3H), 1.58 (s, 3H); ESIMS: 402, 404 [(M+NH4)+].
c) 2-[2-Azido-2-(3-bromo-phenyl)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester
To a solution of 2-[2-(3-bromo-phenyl)-2-hydroxy-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester (5.1 g, 11.92 mmol) in toluene (50 ml) was added trimethylsilyl azide (3.95 ml, 29.8 mmol) and at 0° C. BF3-Et2O (4.53 ml, 35.8 mmol). The reaction mixture was stirred for 2 days at 25° C. and for another day at 40° C. The reaction was carefully quenched by slow addition of the reaction mixture to a cold aqueous NH4OH solution. The product was extracted with EtOAc and the combined organic layers were washed with brine, dried over MgSO4, filtered and evaporated. The crude product was purified by flash-chromatography on silica gel (toluene to toluene/EtOAc 10:1) to provide a diastereomeric mixture of the title compound as a light yellow oil: TLC (toluene/EtOAc 10:1): Rf=0.69; HPLC RtH5=1.560 min; 1H NMR (360 MHz, CDCl3): δ 7.65 (s, 1H), 7.48 (d, 1H), 7.41 (d, 1H), 7.27 (t, 1H), 3.87 and 3.85 (s, 3H), 3.76 (m, 2H), 1.78 and 1.75 (s, 3H), 1.65 and 1.61 (s, 3H); ESIMS: 427, 429 [(M+NH4)+].
d) 2-[2-amino-2-(3-bromo-phenyl)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester
To a solution of the 2-[2-azido-2-(3-bromo-phenyl)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester (4.2 g, 9.22 mmol) in THF-H2O 3:1 (48 ml) was added indium (2.116 g, 18.43 mmol) followed by 4N aqueous HCl over a period of 20 min and stirring for 1 h at 25° C. The reaction mixture was added to a 10% aqueous K2CO3 solution and the product was extracted with EtOAc. The combined organic layers were washed with brine, dried over MgSO4, filtered and evaporated. The crude product was purified by flash-chromatography on NEt3 deactivated silica gel (hexane/EtOAc 2:1 to EtOAc) to provide a diastereomeric mixture of the title compound as a yellow oil: TLC (EtOAc): Rf=0.46; HPLC RtH5=0.999 min; 1H NMR (360 MHz, CDCl3): δ 7.73 (s, 1H), 7.47 (d, 1H), 7.41 (d, 1H), 7.24 (t, 1H), 3.84 and 3.83 (s, 3H), 3.59 (s, 2H), 1.61 and 1.59 (s, 3H), 1.52 and 1.51 (s, 3H); ESIMS: 384, 386 [(M+H)+].
e) (2R*,5R*)-5-(3-Bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-morpholin-3-one and (2S*,5R*)-5-(3-Bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-morpholin-3-one
To a solution of 2-[2-amino-2-(3-bromo-phenyl)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester (2.7 g, 6.89 mmol) in CH2Cl2 (40 ml) was added under argon at 0-5° C. a 2M solution of AlMe3 in heptane (10.33 ml, 20.66 mmol). After stirring for 1 h at 25° C. the reaction mixture was cannulated into a cold 1N aqueous HCl. The product was extracted with CH2Cl2 and the combined organic layers were washed with 5% aqueous NaHCO3 solution, dried over MgSO4, filtered and evaporated. The crude product was purified by flash-chromatography on silica gel (hexane/EtOAc 4:1 to 1:1) to provide the (2R*,5R*)-diastereomer as white crystals: TLC (hexane/EtOAc 3:1): Rf=0.34; HPLC RtH5=1.262 min; 1H NMR (360 MHz, CDCl3): δ 7.55 (s, 1H), 7.52 (m, 1H), 7.32 (m, 2H), 6.61 (s, 1H), 4.04 (s, 2H), 1.67 (s, 3H), 1.58 (s, 3H); ESIMS: 352, 354 [(M+H)+] and the (2S*,5R*)-diastereomer as white crystals: TLC (hexane/EtOAc 3:1): Rf=0.16; HPLC RtH5=1.230 min; 1H NMR (360 MHz, CDCl3): δ 7.57 (s, 1H), 7.52 (d, 1H), 7.37 (d, 1H), 7.32 (t, 1H), 6.45 (s, 1H), 4.11 (dd, 1H), 3.83 (dd, 1H), 1.7 (s, 3H), 1.72 (s, 3H); ESIMS: 352, 354 [(M+H)+].
f) (2S*,5R*)-5-(3-Bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-morpholine-3-thione
To a solution of (2R*,5R*)-5-(3-bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-morpholin-3-one (2.48 g, 7.0 mmol) in toluene (25 ml) was added hexamethyldisiloxane (2.7 ml, 12.7 mmol) and phosphorouspentasulfide (1.878 g, 4.23 mmol) and the reaction mixture was heated at reflux for 16 h. To the cold reaction mixture was added acetone (10 ml) and 20% aqueous K2CO3 solution and the mixture was stirred for 1 h at 25° C. The product was extracted with EtOAc and the combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated. The crude product was crystallized from diisopropylether to provide the purified title compound as white crystals: TLC (hexane/EtOAc 3:1): Rf=0.55; HPLC RtH5=1.408 min; 1H NMR (360 MHz, CDCl3): δ 8.51 (s, 1H), 7.53 (d, 1H), 7.48 (s, 1H), 7.34 (t, 1H), 7.28 (d, 1H), 4.07 (m, 2H), 1.79 (s, 3H), 1.71 (s, 3H); ESIMS: 368, 370 [(M+H)+].
g) (2R*,5R*)-5-(3-Bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
To a solution of (2S*,5R*)-5-(3-bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-morpholine-3-thione (2.5 g, 6.79 mmol) in THF (25 ml) was added concentrated aqueous NH4OH (10.7 ml, 170 mmol) and 80% tert-butylhydroperoxide in H2O (4.25 ml, 33.9 mmol) and the reaction mixture was stirred for 3 h at 25° C. After addition of another 4.25 ml of 80% tert-butyl-hydroperoxide in H2O the reaction mixture was stirred overnight at 25° C. The reaction mixture was slowly added to concentrated sodium metabisulfite solution at 0-10° C., and after addition of 20% aqueous K2CO3 solution the product was extracted with EtOAc. Combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated. The crude title product was used as such for the next transformation. A small amount was purified by flash-chromatography and transferred into the hydrochloride salt with 1N HCl in Et2O to provide the title compound as a white solid: TLC (EtOAc/MeOH 9:1): Rf=0.60; HPLC RtH5=1.024 min; 1H NMR (600 MHz, DMSO-d6): δ 11.55 (s, 1H), 9.54 (d, 2H), 7.74 (s, 1H), 7.60 (d, 1H), 7.51 (d, 1H), 7.42 (t, 1H), 4.15 (d, 1H), 4.06 (d, 1H), 1.75 (s, 3H), 1.66 (s, 3H); ESIMS: 351, 353 [(M+H)+].
h) [(2R*,5R*)-5-(3-Bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To a solution of (2R*,5R*)-5-(3-bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (1.5 g, 4.27 mmol) in acetonitrile (30 ml) was added Boc2O (1.86 g, 8.54 mmol) and NEt3 (1.79 ml, 12.8 mmol) and the reaction mixture was stirred for 4 h at 25° C. The reaction mixture was added to aqueous NaH3PO4 solution and extracted with EtOAc. Combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated. The crude product was purified by flash-chromatography on silica gel (hexane to hexane/EtOAc 1:1) to provide the title compound as a light yellow oil: TLC (hexane/EtOAc 3:1): Rf=0.57; HPLC RtH5=1.549 min; 1H NMR (360 MHz, CDCl3): δ 7.50 (m, 2H), 7.30 (m, 2H), 4.04 (s, 2H), 1.69 (s, 3H), 1.64 (s, 3H), 1.57 (s, 9H); ESIMS: 451, 453 [(M+H)+].
i) [(2R*,5R*)-5-(3-Azido-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To a solution of [(2R*,5R*)-5-(3-bromo-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (1.1 g, 2.39 mmol) in EtOH—H2O 2:1 (15 ml) was added under argon NaN3 (0.62 g, 9.5 mmol), trans-N,N-dimethylcyclohexan-1,2-diamine (0.075 ml, 0.48 mmol), sodium-ascorbate (0.084 g, 0.48 mmol) and CuI (0.091 g, 0.48 mmol) and the resulting reaction mixture was heated for 45 min at 70° C. The reaction mixture was added to saturated aqueous NH4Cl solution and extracted with EtOAc. Combined organic layers were washed with 5% aqueous NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated. The crude title product was obtained as a yellow oil and used as such in the next transformation: TLC (toluene/EtOAc 10:1): Rf=0.53; HPLC RtH5=1.532 min; 1H NMR (360 MHz, CDCl3): δ 7.44 (t, 1H), 7.15 (d, 1H), 7.06 (d, 1H), 6.98 (s, 1H), 4.04 (m, 2H), 1.69 (s, 3H), 1.63 (s, 3H), 1.57 (s, 9H); ESIMS: 412, 414 [(M+H)+].
j) [(2R*,5R*)-5-(3-Amino-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]-oxazin-3-yl]-carbamic acid tert-butyl ester
A solution of [(2R*,5R*)-5-(3-azido-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (0.82 g, 1.92 mmol) in EtOH (10 ml) was stirred in the presence of 10% Pd—C (0.1 g) under an atmosphere of hydrogen at 25° C. for 1.5 h. The catalyst was filtered off over Celite, evaporated and the residual oil was purified by flash-chromatography on silica gel (hexane/EtOAc 10:1 to 1:2) to provide the title compound as a colorless foam: TLC (hexane/EtOAc 1:1): Rf=0.43; HPLC RtH5=1.082 min; 1H NMR (360 MHz, CDCl3): δ 10.94 (s, 1H), 7.21 (t, 1H), 6.74 (d, 1H), 6.67 (d, 1H), 6.66 (s, 1H), 4.01 (s, 2H), 3.78 (broad s, 2H), 1.68 (s, 3H), 1.65 (s, 3H), 1.57 (s, 9H); ESIMS: 386, 388 [(M+H)+].
k) ((2R*,5R*)-5-{3-[(5-bromo-pyridine-2-carbonyl)-amino]-phenyl}-2,5-dimethyl-2-tri-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
To a solution of [(2R*,5R*)-5-(3-amino-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (0.1 g, 0.253 mmol) in DMF (2.5 ml) was added 5-bromo-pyridine-2-carboxylic acid (78 mg, 0.379 mmol), EDC (0.074 g, 0.379 mmol), HOAt (0.053 g, 0.379 mmol) and DIPEA (0.083 g, 0.632 mmol) and the reaction mixture was stirred for 2 h at 25° C. After evaporation of the DMF the residue was taken up in NaH2PO4 solution and extracted with EtOAc. Combined organic layers were washed with 5% NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated. The crude product was crystallized from diisopropylether to provide the title compound as a white crystalline solid: TLC (hexane/EtOAc 1:1): Rf=0.61; HPLC RtH5=1.565 min; 1H NMR (360 MHz, CDCl3): δ 11.01 (s, 1H), 9.92 (s, 1H), 8.71 (dd, 1H), 8.21 (d, 1H), 8.10 (dd, 1H), 7.87 (s, 1H), 7.73 (d, 1H), 7.46 (t, 1H), 7.18 (d, 1H), 4.10 (m, 2H), 1.75 (s, 3H), 1.67 (s, 3H), 1.58 (s, 9H); ESIMS: 571, 573 [(M+H)+].
l) 5-Bromo-pyridine-2-carboxylic acid [3-((3R*,6R*)-5-amino-3,6-dimethyl-6-tri-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride
((2R*,5R*)-5-{3-[(5-bromo-pyridine-2-carbonyl)-amino]-phenyl}-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (0.113 g, 0.194 mmol) was dissolved in THF (1 ml) and 4N HCl (5 ml) and the reaction mixture was stirred for 2 h at 25° C. and 3 h at 40° C. The solvents were removed under reduced pressure and the resulting residue was titurated with Et2O to provide the title compound as a white amorphous solid: TLC (EtOAc/MeOH 9:1): Rf=0.56; HPLC RtH5=1.147 min; 1H NMR (600 MHz, DMSO-d6): δ 11.45 (s, 1H), 10.81 (s, 1H), 9.74 (d, 2H), 8.88 (dd, 1H), 8.34 (dd, 1H), 8.10 (d, 1H), 8.01 (d, 1H), 7.95 (s, 1H), 7.46 (t, 1H), 7.27 (d, 1H), 4.13 (d, 1H), 4.05 (d, 1H), 1.81 (s, 3H), 1.69 (s, 3H); ESIMS: 471, 473 [(M+H)+].
Example 67
The compound in Table 7 can be prepared by a procedure analogous to that used in example 66.










TABLE 7








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







67




11.65 (s, 1H), 10.65 (s, 1H),  9.55 (1, 1H), 9.51 (s, 1H), 8.40 (d, 1H), 8.14 (d, 1H), 8.01 (dd, 1H), 7.94 (s, 1H), 7.63 (dd, 1H), 7.44 (dd, 1H), 7.24 (dd, 1H), 4.18 (d, 1H), 4.07 (d, 1H), 3.90 (s, 3H), 1.78 (s, 3H), 1.58 (s, 3H)
423



5-Methoxy-pyridine-2-carboxylic acid 





[3-((3R*,6R*)-5-amino-3,6-di-methyl-6-trifluoromethyl-





3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride









Examples 68 to 70
The compounds listed in Table 8 can be prepared by a procedure pnalogous to that used in example 66, starting from 5-bromo-2-fluoro-benzoyl chloride.










TABLE 8








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







68




11.65 (s, 1H), 11.00 (s, 1H), 9.60 (d, 2H), 8.84 (s, 1H), 8.34 (dd, 1H), 8.09 (d, 1H), 8.04 (m, 1H), 7.96 (dd, 1H), 7.33 (dd, 1H), 4.31 (d, 1H), 4.09 (d, 1H), 3.92 (s, 3H), 1.75 (s, 3H), 1.70 (s, 3H)
489, 491



5-Bromo-pyridine-2-carboxylic acid





[3-((3R*,6R*)-5-amino-3,6-di-methyl-6-trifluoromethyl-





3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide hydrochloride




 


69




11.68 (s, 1H), 10.81 (s, 1H), 9.59 (d, 2H), 8.40 (d, 1H), 8.12 (d, 1H), 8.02 (m, 1H), 7.97 (d, 1H), 7.62 (dd, 1H), 7.31 (dd, 1H), 4.29 (d, 1H), 4 .09 (d, 1H), 3.92 (s, 3H), 1.77 (s, 3H), 1.70 (s, 3H)
441



5-Methoxy-pyridine-2-carboxylic





acid [3-((3R*,6R*)-5-amino-3,6-di-methyl-6-trifluoromethyl-





3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide hydrochloride




 


70




9.92 (br s, 1H), 8.0-9.1 (m, 5H), 7.89 (m, 1H), 7.51 (m, 1H), 7.09 (dd, 1H), 4.43 (d, 1H), 4.02 (d, 1H), 1.71 (s, 3H), 1.64 (s, 3H)
437



5-Cyano-pyrimidine-2-carboxylic





acid [3-((3R*,6R*)-5-amino-3,6-di-methyl-6-trifluoromethyl-





3,6-di-hydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide trifluoroacetate









Example 71
5-Bromo-pyrimidine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




a) 2-(5-Bromo-2-fluoro-phenyl)-propan-2-ol
To a solution of diisopropyl amine (57.3 ml, 402 mmol) in THF (500 ml) was added under argon a 1.6 M solution of nBuLi in hexane (260 ml, 416 mmol) below −50° C. After stirring for 30 min at −75° C., 4-bromo-1-fluoro benzene (31.1 ml, 277 mmol) was added while keeping the temperature below −70° C. After stirring for 2 h at −75° C., acetone (41.2 ml, 554 mmol) was added below −65° C. and the reaction mixture was stirred for 1 h at −75° C., warmed up to −50° C. and poured onto 10% aqueous NH4Cl solution. The mixture was extracted with TBME, organic phases were washed with aqueous KHSO4 solution, saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated. The crude product was crystallized from hexane to provide the title compound as white crystals: TLC (hexane-EtOAc 3:1): Rf=0.45; HPLC RtH5=1.045 min; 1H NMR (360 MHz, CDCl3): δ 7.74 (dd, 1H), 7.36 (m, 1H), 6.93 (dd, 1H), 2.04 (d, 1H), 1.63 (s, 6H).
b) 4-Bromo-1-fluoro-2-isopropenyl-benzene
To a solution of 2-(5-bromo-2-fluoro-phenyl)-propan-2-ol (119.7 g, 498 mmol) in CH2Cl2 (50 ml) was added hydrochinone (2.74 g, 24.9 mmol) and 250 ml 85% H3PO4. The resulting reaction mixture was stirred for 3.5 h at 50° C. The mixture was poured onto ice-water and extracted with CH2Cl2. The organic phases were washed with 2N aqueous NaOH and water, dried over MgSO4, filtered and concentrated. The crude product was dissolved in hexane and filtered through a plough of silica gel to obtain after concentration at 600 mbar the title compound as a colorless oil: TLC (hexane): Rf=0.52; HPLC RtH5=1.416 min; 1H NMR (360 MHz, CDCl3): δ 7.43 (dd, 1H), 7.37 (m, 1H), 6.94 (dd, 1H), 5.27 (d, 2H), 2.13 (s, 3H).
c) (S)-2-(5-Bromo-2-fluoro-phenyl)-propane-1,2-diol
To a suspension of K3Fe(CN)6 (186 g, 561 mmol), K2CO3 (78 g, 561 mmol), (DHQ)2-PHAL (1.311 g, 1.674 mmol) and K2OsO2(OH)4 (0.378 g, 1 mmol) in t-BuOH—H2O 1:1 (1600 ml) was added 4-bromo-1-fluoro-2-isopropenyl-benzene (36 g, 167 mmol) at 0° C. and the reaction mixture was stirred for 14 h at 0° C. After careful addition of Na2S2O5 (100 g) at 0-5° C. the reaction mixture was stirred for 1 h before extraction with EtOAc. Combined extracts were washed with 5% NaS3O3 solution and brine, dried over MgSO4, filtered and concentrated to give the title compound as a white solid: TLC (hexane-EtOAc 1:1): Rf=0.46; HPLC RtH5=0.767 min; ESIMS: 266, 268 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.71 (dd, 1H), 7.27 (m, 1H), 6.83 (dd, 1H), 3.85 (d, 1H), 3.62 (d, 1H), 2.94 (s, 3H), 2.01 (s, 1H), 1.43 (s, 3H).
d) (S)-2-(5-Bromo-2-fluoro-phenyl)-2-methyl-oxirane
To a solution of (S)-2-(5-bromo-2-fluoro-phenyl)-propane-1,2-diol (37.35 g, 150 mmol) in CH2Cl2 (400 ml) was added under argon NEt3 (41.8 ml, 300 mmol) and dropwise mesyl chloride (12.8 ml, 165 mmol) at 0-5° C. After stirring for 0.5 h at 0-5° C. the reaction mixture was added to cold 1N HCl and extracted with CH2Cl2. Combined extracts were washed with 1N HCl, H2O and saturated NaHCO3 solution, dried over MgSO4, filtered and concentrated. The crude mesylate was dissolved in TBME (500 ml) and 200 ml 2N aqueous NaOH and after stirring for 2 h at 25° C. the mixture was extracted with TBME. Combined extracts were washed with NaH2PO4 solution and brine, dried over MgSO4, filtered and concentrated to provide the (S)-enantiomer as a colorless oil: 78% ee (Chiralpak AS-H 1218, hexane-EtOH 97:3, 0.4 mL/min); TLC (hexane-EtOAc 3:1): Rf=0.69; HPLC RtH5=1.186 min; 1H NMR (360 MHz, CDCl3): δ 7.46 (dd, 1H), 7.30 (m, 1H), 6.83 (dd, 1H), 2.88 (d, 1H), 2.72 (d, 1H), 1.59 (s, 3H).
e) (S)-1-Azido-2-(5-bromo-2-fluoro-phenyl)-propan-2-ol
To a solution of (S)-2-(5-bromo-2-fluoro-phenyl)-2-methyl-oxirane (51.85 g, 224 mmol) in EtOH (800 ml) was added NaN3 (36.8 g, 531 mmol), NH4Cl (60.6 g, 1122 mmol) and 18-crown-6 (59.8 g, 224 mmol) and the reaction mixture was heated at reflux for 6 h. The reaction mixture was filtered and concentrated to half of its volume. The residual oil was extracted with EtOAc. Combined extracts were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated to provide the title compound as a light yellow oil: TLC (hexane-EtOAc 1:1): Rf=0.70; HPLC RtH3=1.115 min; 1H NMR (360 MHz, CDCl3): δ 7.72 (dd, 1H), 7.32 (m, 1H), 6.85 (dd, 1H), 3.73 (d, 1H), 3.51 (d, 1H), 2.44 (s, 1H), 1.50 (s, 3H).
f) (S)-1-Amino-2-(5-bromo-2-fluoro-phenyl)-propan-2-ol
To a suspension of LiAlH4 (4.65 g, 122 mmol) in THF (250 ml) was added under argon at 0-5° C. a solution of (S)-1-azido-2-(5-bromo-2-fluoro-phenyl)-propan-2-ol (33.4 g, 122 mmol) dissolved in THF (150 ml) over a period of 30 min. After stirring for 1 h at 0-5° C., the reaction was quenched by careful addition of water (4.7 ml), 4 N NaOH (4.7 ml) and water (14.1 ml) and stirred again for 3 h at 25° C. The white suspension was dried with MgSO4, filtered and concentrated. The solidified product was re-crystallized from TBME-hexane to provide the title compound as beige crystals: 98% ee (Chiralpak AD-H hexane-EtOH 75-25+0.05% NEt3); TLC (CH2Cl2-MeOH 10:1) Rf=0.10; HPLC RtH5=0.558 min; ESIMS: 248, 250 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 7.76 (dd, 1H), 7.25 (m, 1H), 6.82 (dd, 1H), 4.16 (br s, 1H), 3.19 (d, 1H), 2.72 (d, 1H), 1.44 (s, 3H), 0.95 (br s, 2H).
g) N—[(S)-2-(5-Bromo-2-fluoro-phenyl)-2-hydroxy-propyl]-2-nitro-benzenesulfonamide
To a solution of (S)-1-amino-2-(5-bromo-2-fluoro-phenyl)-propan-2-ol (34.7 g, 140 mmol) in THF (400 ml) was added 2-nitro-benzenesulfonyl chloride (34.9 g, 154 mmol) at 0-5° C. and afterwards 1N aqueous NaOH over a period of 0.5 h. The reaction mixture was stirred for 2 h at 20° C. The reaction mixture was diluted with TBME and washed with water and NaH2PO4 solution and brine, dried over MgSO4, filtered and concentrated to provide the title compound after crystallization from TBME-hexane as beige crystals: TLC (toluene-EtOAc 3:1): Rf=0.51; HPLC RtH5=1.118 min; ESIMS: 450, 452 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.98 (m, 1H), 7.81 (m, 1H), 7.65 (m, 2H), 7.59 (dd, 1H), 7.24 (m, 1H), 6.79 (dd, 1H), 5.60 (t, 1H), 4.16 (br s, 1H), 3.55 (dd, 1H), 3.44 (dd, 1H), 2.51 (s, 1H), 1.51 (s, 3H).
h) (R)-2-(5-Bromo-2-fluoro-phenyl)-2-methyl-1-(2-nitro-benzenesulfonyl)-aziridine
To a solution of N—[(S)-2-(5-bromo-2-fluoro-phenyl)-2-hydroxy-propyl]-2-nitro-benzenesulfonamide (20.8 g, 48 mmol) in CH2Cl2 (400 ml) was added PPh3 (19.2 g, 72.4 mmol) at 0-5° C. and diethyl azodicarboxylate (11.6 ml, 72.4 mmol). The reaction mixture was stirred for 24 h at 25° C. and concentrated. The title compound was obtained after chromatographic purification over silica gel (hexane-EtOAc 20:1 to 2:1) as yellow crystals: TLC (toluene-EtOAc 3:1): Rf=0.69; HPLC RtH5=1.308 min; 1H NMR (360 MHz, CDCl3): δ 8.31 (m, 1H), 7.28 (m, 3H), 7.60 (dd, 1H), 7.42 (m, 1H), 6.91 (dd, 1H), 3.24 (s, 1H), 2.81 (s, 1H), 2.06 (s, 3H).
i) (R)-2-[(R)-2-(5-Bromo-2-fluoro-phenyl)-2-(2-nitro-benzenesulfonylamino)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid ethyl ester
To a suspension of NaH (2.53 g 60% in mineral oil, 63 mmol) in DMF (160 ml) was added drop-wise under argon (R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propionic acid ethyl ester (11.99 g, 63 mmol) and after stirring for 0.5 h at 20° C. (R)-2-(5-bromo-2-fluoro-phenyl)-2-methyl-1-(2-nitro-benzenesulfonyl)-aziridine (21.85 g, 52.6 mmol). The reaction was kept at 25° C. for 16 h. The mixture was added to cold aqueous 2N HCl and the product extracted with TBME. Combined organic layers were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated. The residual solid was re-crystallized from TBME-hexane to provide the title compound as yellow crystals: TLC (hexane-EtOAc 1:1): Rf=0.59; HPLC RtH5=1.444 min; ESIMS: 618, 620 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.83 (dd, 1H), 7.61 (m, 3H), 7.48 (dd, 1H), 7.27 (m, 1H), 6.73 (s, 1H), 6.60 (dd, 1H), 4.33 (m, 2H), 3.84 (s, 2H), 1.84 (s, 3H), 1.57 (s, 3H), 1.33 (t, 3H).
j) (R)-2-[(R)-2-(5-Bromo-2-fluoro-pheyl)-2-(2-nitro-benzenesulfonylamino)-propoxy]-3,3,3-trifluoro-2-methyl-propionamide
A solution of (R)-2-[(R)-2-(5-bromo-2-fluoro-phenyl)-2-(2-nitro-benzenesulfonylamino)-pro-poxy]-3,3,3-trifluoro-2-methyl-propionic acid ethyl ester (26.6 g, 44.2 mmol) in 7N NH3 in MeOH (75 ml) was stirred for 16 h at 50° C. The solvent was removed under reduced pressure and the residual solid re-crystallized from Et2O to give the title compound as yellow crystals: TLC (hexane-EtOAc 1:1): Rf=0.35; HPLC RtH5=1.184 min; ESIMS: 589, 591 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.85 (d, 1H), 7.64 (m, 3H), 7.44 (d, 1H), 7.41 (dd, 1H), 7.26 (m, 1H), 6.68 (br s, 1H), 6.57 (dd, 1H), 6.19 (s, 1H), 5.54 (br s, 1H), 4.24 (d, 1H), 3.93 (d, 1H), 1.79 (s, 3H), 1.67 (s, 3H).
k) N—[(R)-1-(5-Bromo-2-fluoro-phenyl)-2-((R)-1-cyano-2,2,2-trifluoro-1-methyl-ethoxy)-1-methyl-ethyl]-2-nitro-benzenesulfonamide
To a solution of (R)-2-[(R)-2-(5-bromo-2-fluoro-pheyl)-2-(2-nitro-benzenesulfonylamino)-propoxy]-3,3,3-trifluoro-2-methyl-propionamide (20.83 g, 35.6 mmol) in CH2Cl2 (300 ml) was added under argon NEt3 (12.5 ml, 89 mmol) and at 0-5° C. trifluoroacetic anhydride (6.15 ml, 42.7 mmol). After stirring for 4 h at 25° C. the reaction mixture was added to a cold NaHCO3 solution and the product was extracted with CH2Cl2. Combined extracts were washed with cold 0.1 N aqueous HCl, water and saturated NaHCO3 solution, dried over MgSO4, filtered and concentrated to provide the title compound as a yellow oil, which was used as such for the next step: TLC (hexane-EtOAc 1:1): Rf=0.73; HPLC RtH5=1.364 min; ESIMS: 571, 573 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.89 (d, 1H), 7.62 (ddd, 1H), 7.57 (ddd, 1H), 7.52 (m, 2H), 7.29 (m, 1H), 6.58 (dd, 1H), 6.19 (s, 1H), 4.17 (s, 2H), 1.81 (s, 3H), 1.72 (s, 3H).
l) (2R,5R)-5-(5-Bromo-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
To a solution of N—[(R)-1-(5-bromo-2-fluoro-phenyl)-2-((R)-1-cyano-2,2,2-trifluoro-1-methyl-ethoxy)-1-methyl-ethyl]-2-nitro-benzenesulfonamide (6.54 g, 11.8 mmol) and N-acetyl-cysteine (2.4 g, 26.0 mmol) in MeOH (80 ml) was added K2CO3 (3.62 g, 26.0 mmol) and the reaction mixture was heated at 80° C. for 16 h. After removal of the solvent the residue was dissolved in water and extracted with EtOAc. Combined extracts were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated to provide the title compound after chromatographic purification over silica gel (hexane-EtOAc 10:1 to 1:2 containing 0.03% NEt3) as a yellow oil: TLC (hexane-EtOAc 1:1): Rf=0.58; HPLC RtH5=0.843 min; ESIMS: 369, 371 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 7.66 (dd, 1H), 7.35 (m, 1H), 6.91 (dd, 1H), 3.97 (m, 2H), 1.53 (s, 3H), 1.49 (s, 3H).
m) (2R,5R)-5-(2-Fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
A solution of (2R,5R)-5-(5-bromo-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (1.66 g, 4.5 mmol) and sodium acetate (0.369 g, 4.5 mmol) in MeOH (50 ml) was hydrogenated over 10% Pd—C for 6 h at 50° C. The catalyst was filtered off over Celite and the filtrate was concentrated. The residue was dissolved in saturated NaHCO3 solution and extracted with EtOAc. Combined extracts were washed with brine, dried over MgSO4, filtered and concentrated to provide the title compound as a colorless oil: TLC (hexane-EtOAc 1:1): Rf=0.19; HPLC RtH5=0.777 min; ESIMS: 291 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 7.41 (dt, 1H), 7.26 (m, 1H), 7.11 (t, 1H), 7.05 (dd, 1H), 4.11 (dd, 1H), 3.94 (dd, 1H), 1.54 (s, 3H), 1.49 (s, 3H).
n) (2R,5R)-5-(2-Fluoro-5-nitro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
To a solution of (2R,5R)-5-(2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (1.035 g, 3.57 mmol) in H2SO4 (6 ml) was added in portions KNO3 (0.379 g, 3.74 mmol) under ice-water cooling. The reaction mixture was stirred for 2 h at 25° C., diluted with water and basified with K2CO3 under cooling. The product was extracted with EtOAc. Combined extracts were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated. Purification via chromatography on silica gel (hexane-EtOAc 4:1 to 1:1 containing 0.05% NEt3) gave the title compound as a light yellow oil: TLC (hexane-EtOAc 1:1): Rf=0.50; HPLC RtH5=0.749 min; ESIMS: 336 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 8.48 (dd, 1H), 8.14 (m, 1H), 7.15 (dd, 1H), 4.20 (br s, 2H), 4.04 (dd, 1H), 3.91 (dd, 1H), 1.54 (s, 3H), 1.49 (s, 3H).
o) [(2R,5R)-5-(2-Fluoro-5-nitro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To a solution of (2R,5R)-5-(2-fluoro-5-nitro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-di-hydro-2H-[1,4]oxazin-3-ylamine (1.14 g, 3.4 mmol) in ACN (20 ml) was added Boc2O (0.891 g, 4.08 mmol) and NEt3 (0.72 ml, 5.1 mmol) and the mixture was stirred for 16 h at 25° C. The reaction mixture was evaporated and the residual oil purified by chromatography on silica gel (hexane-EtOAc 20:1 to 7:3) to give the title compound after crystallization from Et2O-hexane as beige crystals: TLC (hexane-EtOAc 3:1): Rf=0.37; HPLC RtH5=1.355 min; ESIMS: 436 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 11.04 (br s, 1H), 8.24 (m, 2H), 7.30 (dd, 1H), 4.41 (dd, 1H), 4.11 (dd, 1H), 1.68 (s, 3H), 1.51 (s, 9H), 1.49 (s, 3H).
p) [(2R,5R)-5-(5-Amino-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A solution of [(2R,5R)-5-(2-fluoro-5-nitro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (0.98 g, 2.25 mmol) in isopropanol-THF 2:1 (24 ml) was hydrogenated over 5% Pd—C for 4 h at 50° C. The catalyst was filtered off over Celite and the filtrate was concentrated to provide the title compound after crystallization from TBME-hexane as beige crystals: TLC (hexane-EtOAc 1:1): Rf=0.42; HPLC RtH5=0.955 min; ESIMS: 406 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 6.82 (dd, 1H), 6.52 (m, 2H), 4.30 (dd, 1H), 3.97 (dd, 1H), 3.06 (br s, 2H), 1.58 (s, 3H), 1.48 (s, 3H), 1.46 (s, 9H).
q) ((2R,5R)-5-{5-[(5-Bromo-pyrimidine-2-carbonyl)-amino]-2-fluoro-phenyl}-2,5-di-methyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
To a solution of [(2R,5R)-5-(5-amino-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-di-hydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (76 mg, 0.187 mmol) in DMF (2 ml) was added 5-bromopyridine-2-carboxylic acid (47 mg, 0.225 mmol), EDC.HCl (48 mg, 0.244 mmol), HOAt (29 mg, 0.206 mmol) and DIPEA (0.08 ml, 0.469 mmol) and the reaction mixture was kept at 25° C. for 16 h. The mixture was concentrated, the residue dissolved in EtOAc and washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and purified by chromatography on silica gel (hexane-EtOAc 20:1 to 1:1) to provide the title compound as a light yellow foam: HPLC RtH5=1.297 min); ESIMS: 590, 592 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 10.98 (br s, 1H), 9.71 (br s, 1H), 8.94 (s, 2H), 7.89 (m, 1H), 7.49 (dd, 1H), 7.12 (dd, 1H), 4.38 (d, 1H), 4.04 (d, 1H), 1.66 (s, 3H), 1.56 (s, 3H), 1.52 (s, 9H).
r) 5-Bromo-pyrimidine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride
A solution of ((2R,5R)-5-{5-[(5-bromo-pyrimidine-2-carbonyl)-amino]-2-fluoro-phenyl}-2,5-di-methyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (90 mg, 0.153 mmol) in 4N HCl in dioxane (1 ml) was stirred at 40-45° C. for 6 h. The mixture was concentrated and the residue crystallized from Et2O to yield the title compound as a beige solid: HPLC RtH5=0.837 min); ESIMS: 490, 492 [(M+H)+]; 1H NMR (600 MHz, DMSO-d6): 11.61 (br s, 1H), 11.14 (br s, 1H), 9.61 (br s, 2H), 9.26 (s, 2H), 7.98 (d, 1H), 7.90 (d, 1H), 7.32 (dd, 1H), 4.31 (d, 1H), 4.10 (d, 1H), 1.72 (s, 3H), 1.62 (s, 3H).
Examples 72 to 74
The compounds listed in Table 9 can be prepared by procedures analogous to those used in examples 71 and 72.










TABLE 9








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







72




11.0 (s, 1H), 9.60 (d, 2H), 9.04 (s, 1H), 8.41 (s, 1H), 7.96 (m, 1H), 7.83 (dd, 1H), 7.33 (dd, 1H), 4.37 (d, 1H), 4.11 (d, 1H), 2.56 (s, 3H), 1.73 (s, 3H), 1.70 (s, 3H)
450



5-Cyano-3-methyl-pyridine-2-carboxylic acid





[3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-





2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


73




9.65 (d, 2H), 9.22 (s, 1H), 8.60 (d, 1H), 8.29 (d, 1H), 8.07 (m, 1H), 7.98 (m, 1H), 7.35 (dd, 1H), 4.34 (d, 1H), 4.10 (d, 1H), 1.75 (s, 3H), 1.71 (s, 3H)
436



5-Cyano-pyridine-2-carboxylic acid [3-





((3R,6R)-5-amino-3,6-dimethyl-6-trifluoro-methyl-3,6-dihydro-





2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


74




10.82 (br s, 1H), 9.58 (br s, 2H), 8.86 (s, 1H), 8.46 (s, 1H), 8.00 (m, 2H), 7.28 (m, 1H), 4.52 (br s, 2H), 4.31 (m, 1H), 4.08 (m, 1H), 3.72 (br s, 2H), 3.33 (s, 3H), 1.70 (s, 3H), 1.66 (s, 3H)
486



5-(2-Methoxy-ethoxy)-pyrazine-2-carboxylic





acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride









More Detailed Description of Preparation of Example 72
5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




a) ((2R,5R)-5-{5-[(5-Cyano-3-methyl-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
To a solution of [(2R,5R)-5-(5-amino-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-di-hydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (82 mg, 0.20 mmol) in DMF (2 ml) was added 5-cyano-3-methyl-pyridine-2-carboxylic acid [Acid-3] (42 mg, 0.26 mmol), EDC.HCl (51 mg, 0.26 mmol), HOAt (31 mg, 0.22 mmol) and DIPEA (0.09 ml, 0.52 mmol) and the reaction mixture was kept at 25° C. for 16 h. The mixture was concentrated, the residue dissolved in EtOAc and washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and purified by chromatography on silica gel (hexane-EtOAc 20:1 to 1:1) to provide the title compound as a light yellow foam: TLC (hexane-EtOAc 1:1): Rf=0.81; HPLC RtH5=1.437 min; ESIMS: 550 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 10.96 (br s, 1H), 9.95 (br s, 1H), 8.63 (s, 2H), 7.88 (m, 1H), 7.71 (m, 1H), 7.54 (dd, 1H), 7.08 (dd, 1H), 4.34 (d, 1H), 4.02 (d, 1H), 2.77 (s, 3H), 1.63 (s, 3H), 1.47 (m, 12H).
b) 5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride
To a solution of ((2R,5R)-5-{5-[(5-cyano-3-methyl-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester in CH2Cl2 (0.3 ml) was added TFA (0.6 ml) and the reaction mixture was kept at 25° C. for 2 h. The reaction was added to cold 10% aqueous K2CO3 solution and the product extracted with EtOAc. Combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated to provide 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide as a colorless foam. The title compound was converted into its hydrochloride salt by dissolving the free base in CH2Cl2, adding 1 eq of 2N HCl in Et2O, evaporation to dryness, followed by crystallization from CH2Cl2-Et2O to provide the title compound as a white solid: HPLC RtH5=0.957 min; ESIMS: 450 [(M+H)+]; 1H NMR (600 MHz, DMSO-d6): 11.0 (s, 1H), 9.60 (d, 2H), 9.04 (s, 1H), 8.41 (s, 1H), 7.96 (m, 1H), 7.83 (dd, 1H), 7.33 (dd, 1H), 4.37 (d, 1H), 4.11 (d, 1H), 2.56 (s, 3H), 1.73 (s, 3H), 1.70 (s, 3H).
Example 72a
Preparation of crystalline 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




a) 2-(5-Bromo-2-fluoro-phenyl)-propan-2-ol
To a solution of diisopropyl amine (57.3 ml, 402 mmol) in THF (500 ml) was added under argon a 1.6 M solution of nBuLi in hexane (260 ml, 416 mmol) below −50° C. After stirring for 30 min at −75° C., 4-bromo-1-fluoro benzene (31.1 ml, 277 mmol) was added while keeping the temperature below −70° C. After stirring for 2 h at −75° C., acetone (41.2 ml, 554 mmol) was added below −65° C. and the reaction mixture was stirred for 1 h at −75° C., warmed up to −50° C. and poured onto 10% aqueous NH4Cl solution. The mixture was extracted with TBME, organic phases were washed with aqueous KHSO4 solution, saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated. The crude product was crystallized from hexane to provide the title compound as white crystals: TLC (hexane-EtOAc 3:1): Rf=0.45; UPLC RtH5=1.045 min; 1H NMR (360 MHz, CDCl3): δ 7.74 (dd, 1H), 7.36 (m, 1H), 6.93 (dd, 1H), 2.04 (d, 1H), 1.63 (s, 6H).
b) 4-Bromo-1-fluoro-2-isopropenyl-benzene
To a solution of 2-(5-bromo-2-fluoro-phenyl)-propan-2-ol (119.7 g, 498 mmol) in CH2Cl2 (50 ml) was added hydrochinone (2.74 g, 24.9 mmol) and 250 ml 85% H3PO4. The resulting reaction mixture was stirred for 3.5 h at 50° C. The mixture was poured onto ice-water and extracted with CH2Cl2. The organic phases were washed with 2N aqueous NaOH and water, dried over MgSO4, filtered and concentrated. The crude product was dissolved in hexane and filtered through a plough of silica gel to obtain after concentration at 600 mbar the title compound as a colorless oil: TLC (hexane): Rf=0.52; UPLC RtH5=1.416 min; 1H NMR (360 MHz, CDCl3): δ 7.43 (dd, 1H), 7.37 (m, 1H), 6.94 (dd, 1H), 5.27 (d, 2H), 2.13 (s, 3H).
c) (S)-2-(5-Bromo-2-fluoro-phenyl)-propane-1,2-diol
To a suspension of K3Fe(CN)6 (186 g, 561 mmol), K2CO3 (78 g, 561 mmol), (DHQ)2-PHAL (1.311 g, 1.674 mmol) and K2OsO2(OH)4 (0.378 g, 1 mmol) in t-BuOH—H2O 1:1 (1600 ml) was added 4-bromo-1-fluoro-2-isopropenyl-benzene (36 g, 167 mmol) at 0° C. and the reaction mixture was stirred for 14 h at 0° C. After careful addition of Na2S2O5 (100 g) at 0-5° C. the reaction mixture was stirred for 1 h before extraction with EtOAc. Combined extracts were washed with 5% NaS3O3 solution and brine, dried over MgSO4, filtered and concentrated to give the title compound as a white solid: TLC (hexane-EtOAc 1:1): Rf=0.46; HPLC RtH5=0.767 min; ESIMS: 266, 268 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.71 (dd, 1H), 7.27 (m, 1H), 6.83 (dd, 1H), 3.85 (d, 1H), 3.62 (d, 1H), 2.94 (s, 3H), 2.01 (s, 1H), 1.43 (s, 3H).
d) (S)-2-(5-Bromo-2-fluoro-phenyl)-2-methyl-oxirane
To a solution of (S)-2-(5-bromo-2-fluoro-phenyl)-propane-1,2-diol (37.35 g, 150 mmol) in CH2Cl2 (400 ml) was added under argon NEt3 (41.8 ml, 300 mmol) and dropwise mesyl chloride (12.8 ml, 165 mmol) at 0-5° C. After stirring for 0.5 h at 0-5° C. the reaction mixture was added to cold 1N HCl and extracted with CH2Cl2. Combined extracts were washed with 1N HCl, H2O and saturated NaHCO3 solution, dried over MgSO4, filtered and concentrated. The crude mesylate was dissolved in TBME (500 ml) and 200 ml 2N aqueous NaOH and after stirring for 2 h at 25° C. the mixture was extracted with TBME. Combined extracts were washed with NaH2PO4 solution and brine, dried over MgSO4, filtered and concentrated to provide the (S)-enantiomer as a colorless oil: 78% ee (Chiralpak AS-H 1218, hexane-EtOH 97:3, 0.4 mL/min); TLC (hexane-EtOAc 3:1): Rf=0.69; UPLC RtH5=1.186 min; 1H NMR (360 MHz, CDCl3): δ 7.46 (dd, 1H), 7.30 (m, 1H), 6.83 (dd, 1H), 2.88 (d, 1H), 2.72 (d, 1H), 1.59 (s, 3H).
e) (S)-1-Azido-2-(5-bromo-2-fluoro-phenyl)-propan-2-ol
To a solution of (S)-2-(5-bromo-2-fluoro-phenyl)-2-methyl-oxirane (51.85 g, 224 mmol) in EtOH (800 ml) was added NaN3 (36.8 g, 531 mmol), NH4Cl (60.6 g, 1122 mmol) and 18-crown-6 (59.8 g, 224 mmol) and the reaction mixture was heated at reflux for 6 h. The reaction mixture was filtered and concentrated to half of its volume. The residual oil was extracted with EtOAc. Combined extracts were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated to provide the title compound as a light yellow oil: TLC (hexane-EtOAc 1:1): Rf=0.70; UPLC RtH3=1.115 min; 1H NMR (360 MHz, CDCl3): δ 7.72 (dd, 1H), 7.32 (m, 1H), 6.85 (dd, 1H), 3.73 (d, 1H), 3.51 (d, 1H), 2.44 (s, 1H), 1.50 (s, 3H).
f) (S)-1-Amino-2-(5-bromo-2-fluoro-phenyl)-propan-2-ol
To a suspension of LiAlH4 (4.65 g, 122 mmol) in THF (250 ml) was added under argon at 0-5° C. a solution of (S)-1-azido-2-(5-bromo-2-fluoro-phenyl)-propan-2-ol (33.4 g, 122 mmol) dissolved in THF (150 ml) over a period of 30 min. After stirring for 1 h at 0-5° C., the reaction was quenched by careful addition of water (4.7 ml), 4 N NaOH (4.7 ml) and water (14.1 ml). After stirring for 3 h at 25° C. the white suspension was dried with MgSO4, filtered and concentrated. The solidified product was re-crystallized from TBME-hexane to provide the title compound as beige crystals: 98% ee (Chiralpak AD-H hexane-EtOH 75-25+0.05% NEt3); TLC (CH2Cl2-MeOH 10:1) Rf=0.10; UPLC RtH5=0.558 min; ESIMS: 248, 250 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 7.76 (dd, 1H), 7.25 (m, 1H), 6.82 (dd, 1H), 4.16 (br s, 1H), 3.19 (d, 1H), 2.72 (d, 1H), 1.44 (s, 3H), 0.95 (br s, 2H).
g) N—[(S)-2-(5-Bromo-2-fluoro-phenyl)-2-hydroxy-propyl]-2-nitro-benzenesulfonamide
To a solution of (S)-1-amino-2-(5-bromo-2-fluoro-phenyl)-propan-2-ol (34.7 g, 140 mmol) in THF (400 ml) was added 2-nitro-benzenesulfonyl chloride (34.9 g, 154 mmol) at 0-5° C. and afterwards 1N aqueous NaOH over a period of 0.5 h. The reaction mixture was stirred for 2 h at 20° C. The reaction mixture was diluted with TBME and washed with water and NaH2PO4 solution and brine, dried over MgSO4, filtered and concentrated to provide the title compound after crystallization from TBME-hexane as beige crystals: TLC (toluene-EtOAc 3:1): Rf=0.51; UPLC RtH5=1.118 min; ESIMS: 450, 452 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.98 (m, 1H), 7.81 (m, 1H), 7.65 (m, 2H), 7.59 (dd, 1H), 7.24 (m, 1H), 6.79 (dd, 1H), 5.60 (t, 1H), 4.16 (br s, 1H), 3.55 (dd, 1H), 3.44 (dd, 1H), 2.51 (s, 1H), 1.51 (s, 3H).
h) (R)-2-(5-Bromo-2-fluoro-phenyl)-2-methyl-1-(2-nitro-benzenesulfonyl)-aziridine
To a solution of N—[(S)-2-(5-bromo-2-fluoro-phenyl)-2-hydroxy-propyl]-2-nitro-benzenesulfon-amide (20.8 g, 48 mmol) in CH2Cl2 (400 ml) was added PPh3 (19.2 g, 72.4 mmol) at 0-5° C. and diethyl azodicarboxylate (11.6 ml, 72.4 mmol). The reaction mixture was stirred for 24 h at 25° C. and concentrated. The title compound was obtained after chromatographic purification over silica gel (hexane-EtOAc 20:1 to 2:1) as yellow crystals: TLC (toluene-EtOAc 3:1): Rf=0.69; UPLC RtH5=1.308 min; 1H NMR (360 MHz, CDCl3): δ 8.31 (m, 1H), 7.28 (m, 3H), 7.60 (dd, 1H), 7.42 (m, 1H), 6.91 (dd, 1H), 3.24 (s, 1H), 2.81 (s, 1H), 2.06 (s, 3H).
i) (R)-2-[(R)-2-(5-Bromo-2-fluoro-phenyl)-2-(2-nitro-benzenesulfonylamino)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid ethyl ester
To a suspension of NaH (2.53 g 60% in mineral oil, 63 mmol) in DMF (160 ml) was added drop-wise under argon (R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propionic acid ethyl ester (11.99 g, 63 mmol) and after stirring for 0.5 h at 20° C. (R)-2-(5-bromo-2-fluoro-phenyl)-2-methyl-1-(2-nitro-benzenesulfonyl)-aziridine (21.85 g, 52.6 mmol). The reaction was kept at 25° C. for 16 h. The mixture was added to cold aqueous 2N HCl and the product extracted with TBME. Combined organic layers were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated. The residual solid was re-crystallized from TBME-hexane to provide the title compound as yellow crystals: TLC (hexane-EtOAc 1:1): Rf=0.59; UPLC RtH5=1.444 min; ESIMS: 618, 620 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.83 (dd, 1H), 7.61 (m, 3H), 7.48 (dd, 1H), 7.27 (m, 1H), 6.73 (s, 1H), 6.60 (dd, 1H), 4.33 (m, 2H), 3.84 (s, 2H), 1.84 (s, 3H), 1.57 (s, 3H), 1.33 (t, 3H).
j) (R)-2-[(R)-2-(5-Bromo-2-fluoro-pheyl)-2-(2-nitro-benzenesulfonylamino)-propoxy]-3,3,3-trifluoro-2-methyl-propionamide
A solution of (R)-2-[(R)-2-(5-bromo-2-fluoro-phenyl)-2-(2-nitro-benzenesulfonylamino)-pro-poxy]-3,3,3-trifluoro-2-methyl-propionic acid ethyl ester (26.6 g, 44.2 mmol) in 7N NH3 in MeOH (75 ml) was stirred for 16 h at 50° C. The solvent was removed under reduced pressure and the residual solid re-crystallized from Et2O to give the title compound as yellow crystals: TLC (hexane-EtOAc 1:1): Rf=0.35; UPLC RtH5=1.184 min; ESIMS: 589, 591 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.85 (d, 1H), 7.64 (m, 3H), 7.44 (d, 1H), 7.41 (dd, 1H), 7.26 (m, 1H), 6.68 (br s, 1H), 6.57 (dd, 1H), 6.19 (s, 1H), 5.54 (br s, 1H), 4.24 (d, 1H), 3.93 (d, 1H), 1.79 (s, 3H), 1.67 (s, 3H).
k) N—[(R)-1-(5-Bromo-2-fluoro-phenyl)-2-((R)-1-cyano-2,2,2-trifluoro-1-methyl-ethoxy)-1-methyl-ethyl]-2-nitro-benzenesulfonamide
To a solution of (R)-2-[(R)-2-(5-bromo-2-fluoro-phenyl)-2-(2-nitro-benzenesulfonylamino)-propoxy]-3,3,3-trifluoro-2-methyl-propionamide (20.83 g, 35.6 mmol) in CH2Cl2 (300 ml) was added under argon NEt3 (12.5 ml, 89 mmol) and at 0-5° C. trifluoroacetic anhydride (6.15 ml, 42.7 mmol). After stirring for 4 h at 25° C. the reaction mixture was added to a cold NaHCO3 solution and the product was extracted with CH2Cl2. Combined extracts were washed with cold 0.1 N aqueous HCl, water and saturated NaHCO3 solution, dried over MgSO4, filtered and concentrated to provide the title compound as a yellow oil, which was used as such for the next step: TLC (hexane-EtOAc 1:1): Rf=0.73; UPLC RtH5=1.364 min; ESIMS: 571, 573 [(M+NH4)+]; 1H NMR (360 MHz, CDCl3): δ 7.89 (d, 1H), 7.62 (ddd, 1H), 7.57 (ddd, 1H), 7.52 (m, 2H), 7.29 (m, 1H), 6.58 (dd, 1H), 6.19 (s, 1H), 4.17 (s, 2H), 1.81 (s, 3H), 1.72 (s, 3H).
l) (2R,5R)-5-(5-Bromo-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
To a solution of N—[(R)-1-(5-bromo-2-fluoro-phenyl)-2-((R)-1-cyano-2,2,2-trifluoro-1-methyl-ethoxy)-1-methyl-ethyl]-2-nitro-benzenesulfonamide (6.54 g, 11.8 mmol) and N-acetyl-cysteine (2.4 g, 26.0 mmol) in MeOH (80 ml) was added K2CO3 (3.62 g, 26.0 mmol) and the reaction mixture was heated at 80° C. for 16 h. After removal of the solvent the residue was dissolved in water and extracted with EtOAc. Combined extracts were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated to provide the title compound after chromatographic purification over silica gel (hexane-EtOAc 10:1 to 1:2 containing 0.03% NEt3) as a yellow oil: TLC (hexane-EtOAc 1:1): Rf=0.58; UPLC RtH5=0.843 min; ESIMS: 369, 371 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 7.66 (dd, 1H), 7.35 (m, 1H), 6.91 (dd, 1H), 3.97 (m, 2H), 1.53 (s, 3H), 1.49 (s, 3H).
m) (2R,5R)-5-(2-Fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
A solution of (2R,5R)-5-(5-bromo-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (1.66 g, 4.5 mmol) and sodium acetate (0.369 g, 4.5 mmol) in MeOH (50 ml) was hydrogenated over 10% Pd—C for 6 h at 50° C. The catalyst was filtered off over Celite and the filtrate was concentrated. The residue was dissolved in saturated NaHCO3 solution and extracted with EtOAc. Combined extracts were washed with brine, dried over MgSO4, filtered and concentrated to provide the title compound as a colorless oil: TLC (hexane-EtOAc 1:1): Rf=0.19; UPLC RtH5=0.777 min; ESIMS: 291 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 7.41 (dt, 1H), 7.26 (m, 1H), 7.11 (t, 1H), 7.05 (dd, 1H), 4.11 (dd, 1H), 3.94 (dd, 1H), 1.54 (s, 3H), 1.49 (s, 3H).
n) (2R,5R)-5-(2-Fluoro-5-nitro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
To a solution of (2R,5R)-5-(2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (1.035 g, 3.57 mmol) in H2SO4 (6 ml) was added in portions KNO3 (0.379 g, 3.74 mmol) under ice-water cooling. The reaction mixture was stirred for 2 h at 25° C., diluted with water and basified with K2CO3 under cooling. The product was extracted with EtOAc. Combined extracts were washed with saturated NaHCO3 solution and brine, dried over MgSO4, filtered and concentrated. Purification via chromatography on silica gel (hexane-EtOAc 4:1 to 1:1 containing 0.05% NEt3) gave the title compound as a light yellow oil: TLC (hexane-EtOAc 1:1): Rf=0.50; UPLC RtH5=0.749 min; ESIMS: 336 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 8.48 (dd, 1H), 8.14 (m, 1H), 7.15 (dd, 1H), 4.20 (br s, 2H), 4.04 (dd, 1H), 3.91 (dd, 1H), 1.54 (s, 3H), 1.49 (s, 3H).
o) [(2R,5R)-5-(2-Fluoro-5-nitro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To a solution of (2R,5R)-5-(2-fluoro-5-nitro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-di-hydro-2H-[1,4]oxazin-3-ylamine (1.14 g, 3.4 mmol) in ACN (20 ml) was added Boc2O (0.891 g, 4.08 mmol) and NEt3 (0.72 ml, 5.1 mmol) and the mixture was stirred for 16 h at 25° C. The reaction mixture was evaporated and the residual oil purified by chromatography on silica gel (hexane-EtOAc 20:1 to 7:3) to give the title compound after crystallization from Et2O-hexane as beige crystals: TLC (hexane-EtOAc 3:1): Rf=0.37; UPLC RtH5=1.355 min; ESIMS: 436 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 11.04 (br s, 1H), 8.24 (m, 2H), 7.30 (dd, 1H), 4.41 (dd, 1H), 4.11 (dd, 1H), 1.68 (s, 3H), 1.51 (s, 9H), 1.49 (s, 3H).
p) [(2R,5R)-5-(5-Amino-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A solution of [(2R,5R)-5-(2-fluoro-5-nitro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (0.98 g, 2.25 mmol) in isopropanol-THF 2:1 (24 ml) was hydrogenated over 5% Pd—C for 4 h at 50° C. The catalyst was filtered off over Celite and the filtrate was concentrated to provide the title compound after crystallization from TBME-hexane as beige crystals: TLC (hexane-EtOAc 1:1): Rf=0.42; UPLC RtH5=0.955 min; ESIMS: 406 [(M+H)+]; 1H NMR (360 MHz, CDCl3): δ 6.82 (dd, 1H), 6.52 (m, 2H), 4.30 (dd, 1H), 3.97 (dd, 1H), 3.06 (br s, 2H), 1.58 (s, 3H), 1.48 (s, 3H), 1.46 (s, 9H).
q) ((2R,5R)-5-{5-[(5-Cyano-3-methyl-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
To a solution of [(2R,5R)-5-(5-amino-2-fluoro-phenyl)-2,5-dimethyl-2-trifluoromethyl-5,6-di-hydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (2.2 g, 5.43 mmol) in DMF (20 ml) was added at 0-5° C. 5-cyano-3-methyl-pyridine-2-carboxylic acid (0.968 g, 5.97 mmol), EDC (1.095 g, 7.05 mmol), HOAt (1.182 g, 8.68 mmol) and the reaction mixture was stirred at 25° C. for 16 h. The reaction mixture was added to cold saturated NaHCO3 solution and the product was extracted with TBME. Combined TBME layers were washed with H2O and brine, dried over MgSO4, filtered and concentrated to obtain after crystallization from diisopropylether the title compound as colorless crystals: UPLC RtH5=1.472 min); ESIMS: 550; [(M+H)+]; 1H NMR (400 MHz, CDCl3): δ 11.11 (s, 1H), 10.11 (s, 1H), 8.79 (br s, 1H), 8.01 (s, 1H), 7.84 (m, 1H), 7.68 (dd, 1H), 7.21 (dd, 1H), 4.49 (d, 1H), 4.16 (d, 1H), 1.76 (s, 3H), 1.64 (s, 3H), 1.62 (s, 9H).
r) 5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
To a solution of ((2R,5R)-5-{5-[(5-cyano-3-methyl-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-2,5-dimethyl-2-trifluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (2.27 g, 4.13 mmol) in CH2Cl2 (25 ml) was added TFA (41.3 mmol, 3.18 ml) and the reaction mixture was stirred at 25° C. for 2.5 h. The reaction mixture was added to 10% aqueous NaHCO3 solution (pH >8) and the free base was extracted with EtOAc. Combined organic layers were washed with water and brine, dried over MgSO4, filtered and concentrated. The crude product was re-crystallized twice by dissolving the material in EtOH (15 ml) at 50-60° C. and after saturation with H2O (6-8 ml) the clear solution was allowed to cool to ambient temperature overnight to provide after filtration and drying the title compound in >99% purity as white crystals: UPLC RtH5=0.905 min; ESIMS: 450 [(M+H)+]; 1H NMR (600 MHz, DMSO-d6): 10.72 (s, 1H), 8.97 (s, 1H), 8.39 (s, 1H), 7.78 (d, 1H), 7.71 (m, 1H), 7.15 (t, 1H), 6.08 (br s, 2H), 3.91 (d, 1H), 3.78 (d, 1H), 2.52 (s, 3H), 1.46 (s, 3H), 1.41 (s, 3H).
Example 72b
XRPD and DSC analysis of crystalline 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
Crystalline 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide was analysed by XRPD and the ten most characteristic peaks are shown in Table 9.5 (see also FIG. 2).










TABLE 9.5






d-spacing 
Intensity 
Relative


Degrees 2-Θ
(Å)
(counts)
Intensity %



















8.335
10.59904
22.60
7.1 
Low


9.032
9.78356
2013
6.3 
Low


10.851
8.14682
6590
20.7 
Medium


12.919
6.84703
7660
24.1 
Medium


13.859
6.38459
31816
100 
High


15.403
5.74799
15281
48.0 
Medium


16.211
5.46313
6577
20.7 
Medium


17.129
5.17238
8543
26.9 
Medium


18.158
4.88155
5135
16.1 
Medium


24.514
3.62838
10501
33 
Medium









X-ray powder diffraction (XRPD) analysis was performed using a Brucker D8 Advance x-ray diffractometer. Measurements were taken at about 30 kV and 40 mA under the following conditions:
















Scan rate (continuous scan):
0.3 s/step (equals 107.1 s step time)



Step size:
0.017° (2Theta)



Soller slit
2.5°



Slits (from left to right):
V12 (variable), 6 mm antiscatter slit










The X-ray diffraction pattern was recorded between 2° and 40° (2 theta) with CuKα radiation for identification of the whole pattern.
Crystalline 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide was also analysed by differential scanning calorimetry (DSC) using a Q1000 DSC from TA instruments and found to have an onset of melting at about 94° C. (93.6° C.).
Example 75
5-Cyano-pyridine-2-carboxylic acid [3-((3R*,6R*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




a) N-[1-(5-Bromo-2-fluoro-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-2-chloro-propionamide
[1-(5-Bromo-2-fluoro-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-carbamic acid tert-butyl ester [Example 42 step c)] (2.21 g, 5.75 mmol) was dissolved in 20 mL HCl solution 4 mol/L in dioxane and stirred at room temperature for 60 minutes. The reaction mixture was evaporated to give a white solid which was directly taken up in 15 mL dichloromethane. 20 mL aqueous Na2CO3 solution (10% w/w) was added and the emulsion was cooled to 0-5° C. Racemic 2-chloro-propionyl chloride (787 mg, 6.20 mmol) was added dropwise and the reaction mixture was slowly warmed to room temperature. After 30 minutes, the layers were separated and washed with dichloromethane. The organic layers were combined, dried over Na2SO4 and evaporated. The crude product was purified on a silica gel column by eluting with heptanes/EtOAc 3/1→2/1 to give 632 mg of the first eluting and 619 mg of the second eluting diastereomer.
Analytical data of first eluting diastereomer:
HPLC RtH1=2.403 min; ESIMS [M+H]+=374, 376 (1 Br);
1H-NMR (CDCl3, 360 MHz): 7.56-7.46 (m, 2H), 7.39 (dd, 1H), 7.06 (dd, 1H), 6.35 (t, J=54 Hz, 1H), 4.64-4.56 (dd, 1H), 4.40-4.29 (m, 1H), 4.21-4.14 (m, 1H), 4.07-4.00 (dd, 1H), 1.86 (d, 3H).
Analytical data of second eluting diastereomer:
HPLC RtH1=2.409 min; ESIMS [M+H]+=374, 376 (1 Br)
1H-NMR (CDCl3, 360 MHz): 7.46-7.38 (m, 1H), 7.36 (s, 1H), 7.31 (dd, 1H), 6.95 (dd, 1H), 6.23 (t, J=54 Hz, 1H), 4.53-4.44 (dd, 1H), 4.30-4.20 (m, 1H), 4.11-4.03 (m, 1H), 4.01-3.95 (dd, 1H), 1.77 (d, 3H).
b) 5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-2-methyl-morpholin-3-one
A solution of N-[1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-2-chloro-propionamide first eluting diastereomer (442 mg, 1.180 mmol) in 4.4 mL acetonitrile was treated with potassium hydroxide (86 mg, 1.298 mmol) and stirred over night. Additional potassium hydroxide (26 mg, 0.472 mmol) was added and the reaction mixture was stirred for another night. Eventually, the reaction mixture was partitioned between 1N HCl and EtOAc. The layers were separated, washed with brine and EtOAc. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was crystallized from TBME to give 251 mg of the title compound as white crystals.
HPLC: RtH1=2.221 min; ESIMS [M+H]+=338, 340 (1 Br);
1H-NMR (DMSO-d6, 360 MHz): 8.96 (s, 1H), 7.82 (m, 1H), 7.73-7.65 (m, 1H), 7.30 (dd, 1H), 6.59 (t, J=54 Hz, 1H), 4.46 (d, 1H), 4.23-4.15 (dd, 1H), 3.89-3.80 (m, 1H), 1.33 (d, 3H).
c) 5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-2-methyl-morpholine-3-thione
To a solution of 5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-2-methyl-morpholin-3-one (659 mg, 1.949 mmol) in 6.6 mL pyridine was added phosphorus pentasulfide (433 mg, 1.949 mmol) and the mixture was heated to 80° C. for 120 minutes. The reaction mixture was cooled to room temperature and partitioned between 0.1 N NaOH and EtOAc. The layers were separated, washed with brine and EtOAc. The combined organic layers were dried over MgSO4.H2O and evaporated to give 704 mg of the title compound as a diastereomeric mixture.
HPLC: RtH1=2.961 min; ESIMS [M+H]+=354, 356 (1 Br),
RtH1=3.007 min; ESIMS [M+H]+=354, 356 (1 Br);
1H-NMR of diastereomeric mixture (DMSO-d6, 360 MHz): 11.32 and 11.26 (s, 1H), 7.82-7.71 and 7.59 (m, 2H), 7.45-7.33 (m, 1H), 6.72 and 6.63 (t, J=54 Hz, 1H), 4.62-4.41 and 4.04-3.95 (m, 3H), 1.62 and 1.51 (d, 3H).
d) [5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
This compound was obtained from 5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-2-methyl-morpholine-3-thione by a similar sequence as described for example 42 steps g) to j) as a diastereomeric mixture (white foam).
HPLC: RtH3=2.793 min; ESIMS [M+H]+=374;
Rf (hexane/EtOAc 1/1): 0.40 (isomer 1, major spot), 0.47 (isomer 2, minor spot);
1H-NMR of diastereomeric mixture (CDCl3, 360 MHz, broad signals due to rotamers): 11.00 and 11.96 (s, 1H), 7.01-7.89 (m, 1H), 6.76-6.62 (m, 2H), 6.32 (t, J=54 Hz, 1H), 4.66-3.92 (m, 3H), 3.70 (s, 2H), 1.59-1.56 (s, 12H).
e) (5-{5-[(5-Cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
A solution of [5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (140 mg, 0.375 mmol), 5-cyano-2-pyridinecarboxylic acid (83 mg, 0.562 mmol) and HOAT (92 mg, 0.675 mmol) in 2 mL DMF was cooled to 0-5° C. EDC (108 mg, 0.562 mmol) followed by DIPEA (97 mg, 0.750 mmol) was added. The reaction mixture was allowed to warm up to room temperature. After 135 minutes, the mixture was partitioned between saturated aqueous NaHCO3 solution and EtOAc. The layers were separated, washed with saturated aqueous NaHCO3 solution, brine and EtOAc. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/EtOAc 3/1→2/1 to give the title compound as a diasteromeric mixture (white foam).
Rf (hexane/EtOAc 2/1): 0.36 (isomer 1), 0.30 (isomer 2);
HPLC: RtH3=2.870 min; ESIMS [M+H]+=504;
1H-NMR of diastereomeric mixture (CDCl3, 360 MHz, broad signals due to rotamers): 11.14 and 11.07 (s, 1H), 9.93 (s, 1H), 8.95 and 8.92 (s, 1H), 8.50-8.42 (m, 1H), 8.26 and 8.24 (d, 1H), 8.16-7.97 (m, 1H), 7.79-7.74 (m, 1H), 7.28-7.12 (m, 1H), 6.36 (t, J=54 Hz, 1H), 4.72-3.94 (m, 3H), 1.67-1.43 (m, 12H).
f) 5-Cyano-pyridine-2-carboxylic acid [3-((3R*,6R*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride
To a solution of (5-{5-[(5-cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (170 mg, 0.338 mmol) in 1.95 mL dichloromethane was added 0.65 mL TFA. After the solution had been stirring for 45 minutes it was evaporated at room temperature. The residue was taken up in EtOAc and extracted with saturated aqueous NaHCO3 solution. The layers were separated, washed with brine and EtOAc. The combined organic layers were evaporated. The crude product was purified on a silica gel column by eluting with CH2Cl2/0.5-3% EtOH:NH3 9:1 to give a first and a second eluting isomer. Each isomer was individually dissolved in THF and 0.1 mL 1N HCl in diethyl ether was added. The mixtures were evaporated to give 35.8 mg of the first eluting and 43.5 mg of the second eluting isomer as their corresponding hydrochlorides.
Analytical data of first eluting isomer, 5-cyano-pyridine-2-carboxylic acid [3-((3R*,6R*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride:
HPLC: RtH3=2.774 min; ESIMS [M+H]+=404;
1H-NMR (DMSO, 600 MHz): 11.06 (s, 1H), 10.90 (s, 1H), 9.57 (s, 1H), 9.22 (s, 1H), 8.85 (s, 1H), 8.61 (d, 1H), 8.30 (d, 1H), 8.17-8.13 (m, 1H), 8.09-8.04 (m, 1H), 7.41 (t, 1H), 6.81 (t, J=54 Hz, 1H), 4.81 (d, 1H), 4.46 (d, 1H), 4.04 (d, 1H), 1.57 (d, 3H).
Example 76
5-Cyano-pyridine-2-carboxylic acid [3-((3R*,6S*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




To a solution of (5-{5-[(5-cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester [example 75 step e)] (170 mg, 0.338 mmol) in 1.95 mL dichloromethane was added 0.65 mL TFA. After the solution had been stirring for 45 minutes it was evaporated at room temperature. The residue was taken up in EtOAc and extracted with saturated aqueous NaHCO3 solution. The layers were separated, washed with brine and EtOAc. The combined organic layers were evaporated. The crude product was purified on a silica gel column by eluting with CH2Cl2/0.5-3% EtOH:NH3 9:1 to give a first and a second eluting isomer. Each isomer was individually dissolved in THF and 0.1 mL 1N HCl in diethyl ether was added. The mixtures were evaporated to give 35.8 mg of the first eluting and 43.5 mg of the second eluting isomer as their corresponding hydrochlorides.
Analytical data of second eluting isomer, 5-cyano-pyridine-2-carboxylic acid [3-((3R*,6S*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride:
HPLC: RtH3=2.746 min; ESIMS [M+H]+=404;
1H-NMR (DMSO, 600 MHz): 11.17 (s, 1H), 11.05 (s, 1H), 9.71 (s, 1H), 9.22 (s, 1H), 8.92 (s, 1H), 8.60 (d, 1H), 8.31 (d, 1H), 8.16-8.10 (m, 1H), 8.08-8.02 (m, 1H), 7.40 (t, 1H), 6.77 (t, J=54 Hz, 1H), 4.86 (d, 1H), 4.34 (d, 1H), 4.13 (d, 1H), 1.50 (d, 3H).
Example 77
5-Bromo-pyridine-2-carboxylic acid [3-((3R*,6R*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




a) (5-{5-[(5-Bromo-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
This compound was prepared from 5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester [example 75 step d)] in an analogous manner as described for example 75 step e).
Rf (hexane/EtOAc 3/1): 0.26 (isomer 1), 0.22 (isomer 2);
HPLC: RtH3=3.137 min; ESIMS [M+H]+=557/559;
1H-NMR of diastereomeric mixture (CDCl3, 360 MHz, broad signals due to rotamers): 11.04 and 10.97 (s, 1H), 9.79 (s, 1H), 8.63-8.57 (m, 1H), 8.13-8.06 (m, 1H), 8.03-7.45 (m, 3H), 7.16-7.00 (m, 1H), 6.24 (t, J=54 Hz, 1H), 4.62-3.86 (m, 3H), 1.56-1.34 (m, 12H).
b) 5-Bromo-pyridine-2-carboxylic acid[3-((3R*,6R*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride
(5-{5-[(5-Bromo-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (179 mg, 0.321 mmol) was dissolved in HCl solution 4 mol/L in dioxane (2.4 mL, 9.63 mmol) and 0.1 mL HCl solution 3 mol/L in methanol was added as a co-solvent. The sealed reaction vessel was heated to 50° C. for 120 minutes. The mixture was evaporated; its residue was taken up in EtOAc and extracted with saturated aqueous NaHCO3 solution. The layers were separated, washed with brine and EtOAc. The combined organic layers were evaporated. The crude product was purified on a silica gel column by eluting with CH2Cl2/0.5-2% EtOH:NH3 9:1 to give a first and a second eluting isomer. Each isomer was individually dissolved in THF and 0.1 mL 1N HCl in diethyl ether was added. The mixtures were evaporated to give 37.0 mg of the first eluting and 54.3 mg of the second eluting isomer as their corresponding hydrochlorides.
Analytical data of first eluting isomer, 5-bromo-pyridine-2-carboxylic acid [3-((3R*,6R*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride:
HPLC: RtH3=2.910 min; ESIMS [M+H]+=457/459;
1H-NMR (DMSO, 600 MHz): 10.93 (s, 1H), 10.91 (s, 1H), 9.63 (s, 1H), 8.94 (s, 1H), 8.88 (s, 1H), 8.35 (d, 1H), 8.15-8.04 (m, 3H), 7.39 (dd, 1H), 6.81 (t, J=54 Hz, 1H), 4.81 (d, 1H), 4.48 (d, 1H), 4.05 (d, 1H), 1.58 (d, 3H).
Example 78
5-Bromo-pyridine-2-carboxylic acid [3-((3R*,6S*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




(5-{5-[(5-Bromo-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-2-methyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester [example 77 step a)] (179 mg, 0.321 mmol) was dissolved in HCl solution 4 mol/L in dioxane (2.4 mL, 9.63 mmol) and 0.1 mL HCl solution 3 mol/L in methanol was added as a co-solvent. The sealed reaction vessel was heated to 50° C. for 120 minutes. The mixture was evaporated; its residue was taken up in EtOAc and extracted with saturated aqueous NaHCO3 solution. The layers were separated, washed with brine and EtOAc. The combined organic layers were evaporated. The crude product was purified on a silica gel column by eluting with CH2Cl2/0.5-2% EtOH:NH3 9:1 to give a first and a second eluting isomer. Each isomer was individually dissolved in THF and 0.1 mL 1N HCl in diethyl ether was added. The mixtures were evaporated to give 37.0 mg of the first eluting and 54.3 mg of the second eluting isomer as their corresponding hydrochlorides.
Analytical data of second eluting isomer, 5-bromo-pyridine-2-carboxylic acid [3-((3R*,6S*)-5-amino-3-difluoromethyl-6-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride:
HPLC: RtH3=2.916 min; ESIMS [M+H]+=457/459;
1H-NMR (DMSO, 600 MHz): 11.03 (s, 2H), 9.70 (s, 1H), 8.91 (s, 1H), 8.88 (s, 1H), 8.34 (d, 1H), 8.13-8.08 (m, 2H), 8.04-8.00 (m, 1H), 7.38 (dd, 1H), 6.77 (t, J=54 Hz, 1H), 4.86 (d, 1H), 4.34 (d, 1H), 4.13 (d, 1H), 1.50 (d, 3H).
Example 79
5-Cyano-pyridine-2-carboxylic acid[3-(5-amino-3-difluoromethyl-6,6-dimethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




a) 2-(5-Bromo-2-fluoro-phenyl)-2-difluoromethyl-1-(2-nitro-benzenesulfonyl)-aziridine
2-Amino-2-(5-bromo-2-fluoro-phenyl)-3,3-difluoro-propan-1-ol (13.04 g, 45.9 mmol) [examples 42 step d)] was dissolved in 261 mL acetonitrile, 2-nitrobenzenesulfonyl chloride (22.38 g, 101 mmol) and potassium hydrogencarbonate (13.79 g, 138 mmol) were added. The mixture was heated to 80° C. and stirred over night. After this period, the reaction mixture was cooled down and partitioned between saturated aqueous NaHCO3 solution and TBME. The layers were separated, washed with brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/dichloromethane 2/1→1/2 to give 7.71 g of the title compound as white crystals.
HPLC: RtH1=3.309 min; ESIMS [M+Na]+=473, 475 (1 Br);
1H-NMR (CDCl3, 360 MHz): 8.33-8.26 (m, 1H), 7.87-7.78 (m, 3H), 7.76 (dd, 1H), 7.60-7.53 (m, 1H), 7.05 (t, 1H), 6.22 (t, J=54 Hz, 1H), 3.42 (s, 1H), 3.28 (s, 1H).
b) 2-[2-(5-Bromo-2-fluoro-phenyl)-3,3-difluoro-2-(2-nitro-benzenesulfonylamino)-propoxy]-2-methyl-propionicacid tert-butyl ester
To a solution of tert-butyl α-hydroxyisobutyrate (533 mg, 3.32 mmol) in 4.5 mL DMF and 0.75 mL THF was added portion wise (133 mg, 3.32 mmol) sodium hydride at room temperature. After the reaction mixture had been stirring for 15 minutes, a solution of 2-(5-bromo-2-fluoro-phenyl)-2-difluoromethyl-1-(2-nitro-benzenesulfonyl)-aziridine (1 g, 2.22 mmol) was added. The reaction mixture was stirred at rt for 150 minutes and quenched with aqueous NH4Cl solution. TBME was added, the layers were separated, washed with brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/EtOAc 6/1→5/1 to give 1.10 g of the title compound as a pale yellow resin.
HPLC: RtH7=3.471 min; ESIMS [M+Na]+=633, 635 (1 Br);
1H-NMR (CDCl3, 360 MHz): 7.94 (dd, 1H), 7.82 (dd, 1H), 7.68 (t, 1H), 7.57 (d, 1H), 7.49 (t, 1H), 7.42 (s, 1H), 7.37-7.32 (m, 1H), 6.90 (dd, 1H), 6.72 (t, J=54 Hz, 1H), 4.02 (d, 1H), 3.94 (d, 1H), 1.58 (s, 9H), 1.47 (s, 3H), 1.45 (s, 3H).
c) 5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-2,2-dimethyl-4-(2-nitro-benzenesulfonyl)-morpholin-3-one
To a solution of 2-[2-(5-bromo-2-fluoro-phenyl)-3,3-difluoro-2-(2-nitro-benzenesulfonylamino)-propoxy]-2-methyl-propionicacid tert-butyl ester (1.10 g, 1.80 mmol) in 8 mL dichloromethane was added 4 mL trifluoroacetic acid. After the reaction mixture had been stirring at room temperature for 60 minutes, it was evaporated to give 1.10 g of a white solid. This solid was directly dissolved in a mixture of 10 mL dichloromethane and N-methylmorpholine (546 mg, 5.40 mmol) followed by drop wise addition of ethyl chloroformate (293 mg, 2.70 mmol). After the reaction mixture had been stirring for 150 minutes at room temperature, the reaction mixture was partitioned between TBME and saturated aqueous NaHCO3. The layers were separated, washed with 1N HCl, brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was crystallized from TBME/hexane to give 822 mg of the title compound as white crystals.
HPLC: RtH6=3.087 min; ESIMS [M+H]+=537, 539 (1 Br);
1H-NMR (CDCl3, 360 MHz): 8.15 (d, 1H), 7.82-7.70 (m, 2H), 7.65 (dd, 1H), 7.61-7.53 (m, 2H), 7.18 (t, J=54 Hz, 1H), 7.09 (dd, 1H), 4.49 (d, 1H), 4.25 (d, 1H), 1.56 (s, 3H), 1.40 (s, 3H)
d) 5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-2,2-dimethyl-morpholin-3-one
To a solution of 5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-2,2-dimethyl-4-(2-nitro-benzenesulfonyl)-morpholin-3-one (6.29 g, 11.71 mmol) and thioglycolic acid (1.83 g, 19.90 mmol) in 63 mL DMF was added potassium carbonate (6.47 g, 46.8 mmol). The reaction mixture was heated to 60° C. After 120 minutes, additional thioglycolic acid (324 mg, 3.51 mmol) was added. 30 minutes later on, the reaction mixture was cooled to room temperature and partitioned between EtOAc and water. The layers were separated, washed with saturated aqueous NaHCO3, brine and EtOAc. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was crystallized from TBME/hexane to give 3.14 g of the title compound as white crystals.
HPLC: RtH1=2.476 min; ESIMS [M+H]+=352, 354 (1 Br);
1H-NMR (DMSO-d6, 360 MHz): 8.94 (s, 1H), 7.76-7.65 (m, 2H), 7.32 (dd, 1H), 6.55 (t, J=54 Hz, 1H), 4.20 (d, 1H), 4.08 (d, 1H), 1.37 (s, 3H), 1.28 (s, 3H).
e) 5-Difluoromethyl-5-(2-fluoro-phenyl)-2,2-dimethyl-morpholin-3-one
5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-2,2-dimethyl-morpholin-3-one (3.14 g, 8.92 mmol) and sodium acetate (1.46 g, 17.83 mmol) were suspended in 100 mL methanol and 10 mL THF. Eventually, 10% Pd on charcoal (315 mg) was added and the reaction mixture was treated with hydrogen (balloon) at rt. After 60 minutes the reaction mixture was filtered over celite and evaporated. The residue was partitioned between aqueous Na2CO3 solution and EtOAc. The layers were separated, washed with brine and EtOAc. The combined organic layers were dried over MgSO4.H2O and evaporated to give 2.42 g of the title compound as a white solid.
HPLC: RtH3=3.008 min; ESIMS [M+H]+=274;
1H-NMR (DMSO-d6, 360 MHz): 8.87 (s, 1H), 7.56 (t, 1H), 7.53-7.45 (m, 1H), 7.36-7.24 (m, 2H), 6.54 (t, J=54 Hz, 1H), 4.19 (d, 1H), 4.09 (d, 1H), 1.37 (s, 3H), 1.27 (s, 1H).
f) 5-Difluoromethyl-5-(2-fluoro-phenyl)-2,2-dimethyl-morpholine-3-thione
To a solution of 5-difluoromethyl-5-(2-fluoro-phenyl)-2,2-dimethyl-morpholin-3-one (2.41 g, 8.82 mmol) and hexamethyldisiloxane (2.58 g, 15.88 mmol) in toluene was added) phosphorous pentasulfide (2.35 g, 10.58 mmol). The reaction mixture was heated to 100° C. and stirred over night. After the reaction mixture had been cooled to room temperature, 23 mL Acetone and 33 mL aqueous K2CO3 solution (10% w/w) were added. This mixture was stirred for 90 minutes and then partitioned between water and EtOAc. The layers were separated, washed with 0.1 N NaOH, brine and EtOAc. The organic layers were combined, dried over MgSO4.H2O and evaporated. The crude product was crystallized from TBME/hexane to give 2.28 g of the title compound as white crystals
HPLC: RtH3=3.503 min; ESIMS [M+H]+=290;
1H-NMR (DMSO-d6, 360 MHz): 11.13 (s, 1H), 7.55-7.42 (m, 2H), 7.37-7.28 (m, 2H), 6.61 (t, J=54 Hz, 1H), 4.19 (dd, 2H), 1.60 (s, 3H), 1.48 (s, 3H).
g) 5-Difluoromethyl-5-(2-fluoro-phenyl)-2,2-dimethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
5-Difluoromethyl-5-(2-fluoro-phenyl)-2,2-dimethyl-morpholine-3-thione (2.50 g, 8.64 mmol) was dissolved in NH3 solution 7 mol/L in methanol (40.7 mL, 285 mmol). The sealed reaction vessel was heated to 80° C. for 7 h, then the temperature was lowered to 70° C. and the reaction mixture was stirred over night. The reaction mixture was evaporated and purified on a silica gel column by eluting with CH2Cl2/1-4% EtOH:NH3 9:1 to give 2.09 g of the title compound as an off-white solid.
HPLC: RtH3=2.575 min; ESIMS [M+H]+=273;
1H-NMR (DMSO-d6, 360 MHz): 7.78 (t, 1H), 7.41-7.32 (m, 1H), 7.26-7.11 (m, 2H), 6.14 (s, 2H), 6.11 (t, J=54 Hz, 1H), 4.11 (dd, 1H), 3.87 (d, 1H), 1.39 (s, 3H), 1.24 (s, 3H).
h) 5-Cyano-pyridine-2-carboxylic acid[3-(5-amino-3-difluoromethyl-6,6-dimethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
This compound was obtained from 5-difluoromethyl-5-(2-fluoro-phenyl)-2,2-dimethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine by a similar sequence as described for example 98 steps h) to l). With the exception that after the extraction, the base was not converted into a hydrochloride. The free base was crystallized from 2-propanol instead to give the title compound as white crystals.
HPLC: RtH3=2.818 min; ESIMS [M+H]+=418;
1H-NMR (DMSO, 600 MHz): 10.84 (s, 1H), 9.20 (s, 1H) 8.58 (d, 1H), 8.28 (d, 1H), 8.14-8.10 (m, 1H), 7.85-7.80 (m, 1H), 7.18 (t, 1H), 6.13 (s, 2H), 6.13 (t, J=54 Hz, 1H), 4.04 (d, 1H), 3.87 (d, 1H), 1.38 (s, 3H), 1.26 (s, 3H).
Example 80
The compounds listed in Table 10 can be prepared by a procedure analogous to that used in Example 79, using 4N HCl in dioxane in the last step.










TABLE 10








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







80




11.01 (s, 2H), 9.76 (s, 1H) 8.97 (s, 1H), 8.88 (s, 1H), 8.35 (d, 1H), 8.10 (d, 2H), 8.06 (d, 1H), 7.39 (t, 1H), 6.79 (t, J = 54 Hz, 1H), 4.21 (dd, 2H), 1.61 (s, 3H), 1.55 (s, 3H)
471, 473



5-Bromo-pyridine-2-carboxylic acid





[3-(5-amino-3-difluoromethyl-6,6-dimethyl-3,6-





dihydro-2H-[1,4]oxazin-





3-yl)-4-fluoro-phenyl]-amide hydrochloride









Examples 81 to 84
The compounds listed in Table 11 can be prepared by a procedure analogous to that described in example 34, starting from 1,5-dibromo-2,4-difluoro-benzene.










TABLE 11








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







81




10.45 (s, 1H), 8.88 (d, 1H), 8.33 (dd, 1H), 8.16 (t, 1H), 8.06 (d, 1H), 7.37 (t, 1H), 6.21 (br. s., 2H), 6.09 (t, 1H, CHF2), 4.19 (dd, 1H), 4.02 (d, 1H), 3.91 (d, 1H), 3.80 (d, 1H)
461, 463



5-Bromo-pyridine-2-carboxylic acid [5-(5-





amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-2,4-difluoro-phenyl]-amide hydrochloride




 


82




11.06 (s, 1H), 10.76 (s, 1H), 9.76 (s, 1H), 9.24 (s, 1H), 8.78 (s, 1H), 8.61 (dd, 1H), 8.28 (d, 1H), 7.94 (t, 1H), 7.66 (t, 1H), 6.76 (t, 1H, CHF2), 4.77-4.58 (m, 2H), 4.36 (d, 1H), 4.21 (d, 1H)
408



5-Cyano-pyridine-2-carboxylic acid [5-(5-





amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-2,4-difluoro-phenyl]-amide hydrochloride




 


83




11.07 (s, 1H), 10.37 (s, 1H), 9.77 (s, 1H), 8.78 (s, 1H), 8.37 (s, 1H), 8.06-7.98 (m, 2H), 7.62 (t, 1H), 6.76 (t, 1H, CHF2), 4.76-4.59 (m, 2H), 4.37 (d, 1H), 4.19 (d, 1H), 3.91 (s, 3H)
491, 493



5-Bromo-3-methoxy-pyridine-2-carboxylic acid





[5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-2,4-difluoro-phenyl]-amide hydrochloride




 


84




11.99 (br. s., 1H), 11.03 (br. s., 1H), 10.96 (br. s., 1H), 9.74 (br. s., 1H), 8.76 (br. s., 1H), 8.39 (s, 1H), 7.91 (s, 1H), 7.82 (br. s., 1H), 7.66 (br. s., 1H), 6.75 (t, 1H, CHF2), 4.70-4.61 (m, 2H), 4.36 (d, 1H), 4.20 (d, 1H)
477, 479



5-Bromo-3-hydroxy-pyridine-2-carboxylic acid





[5-(5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-





3-yl)-2,4-difluoro-phenyl]-amide hydrochloride









Example 85
5-Chloro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




a) 4-Bromo-1-fluoro-2-nitromethyl-benzene
A mixture of 4-bromo-1-fluoro-2-bromomethyl-benzene (5 g, 18.66 mmol) and AgNO2 (3.45 g, 22.39 mmol) were stirred in 62 ml TBME for 7 h. The dark mixture was filtered over celite, washed with TBME and evaporated. The crude product was purified by chromatography on silica gel (heptane/EtOAc 20/1) to provide the title compound as a yellow oil.
TLC (Hex: EE/9:1) Rf 0.3
HPLC: RtH4=2.449 min;
1H-NMR (CDCl3, 360 MHz): 7.64-7.58 (m, 2H), 7.12 (t, 1H), 5.50 (s, 2H).
b) 2-(5-Bromo-2-fluoro-phenyl)-2-nitro-propane-1,3-diol
A solution of 4-bromo-1-fluoro-2-nitromethyl-benzene (7.75 g, 33.1 mmol), formaldehyde (35%, aqueous) (5.47 ml, 69.5 mmol) and Et3N (2.3 ml, 16.56 mmol) were stirred in 66 ml dioxane for 3 h. The solution was diluted with brine and extracted with TBME. The organic layer was washed with brine, dried with Na2SO4 and evaporated. The crude product was purified by chromatography on silica gel (heptane/EtOAc 3/1) to provide the title compound as a white solid.
TLC (Hex: EE/2:1) Rf 0.24
HPLC: RtH4=2.070 min; ESIMS [M+Na]+=316, 318 (1 Br);
1H-NMR (DMSO, 360 MHz): 7.65-7.60 (m, 1H), 7.55 (dd, 1H), 7.75 (dd, 1H), 5.50 (s, 2H), 4.20 (br t, 4H).
c) 2-Amino-2-(5-bromo-2-fluoro-phenyl)-propane-1,3-diol
A solution of 2-(5-bromo-2-fluoro-phenyl)-2-nitro-propane-1,3-diol (7 g, 23.8 mmol) in 35 ml AcOH was added dropwise to a mixture of zinc (9.34 g, 143 mmol) in 35 ml AcOH while the temperature did not rise above 40° C. The mixture was stirred for 1 h, filtered over celite and washed with MeOH. The filtrate was evaporated, diluted with water and washed with TBME. The aqueous layer was basified with 2 N NaOH and NH3 (25%, aqueous), saturated with NaCl and extracted with EtOAc. The organic layer was washed with brine, dried with Na2SO4 and evaporated to provide the title compound as an off-white solid.
TLC (EE: MeOH/19:1+1% NH3 (25%, aqueous)) Rf 0.38
HPLC: RtH2=2.332 min; ESIMS [M+H]+=246, 266 (1 Br);
1H-NMR (DMSO, 360 MHz): 7.82 (dd, 1H), 7.50-7.42 (m, 1H), 7.09 (dd, 1H), 4.71 (br s, 2H), 3.36 (dd, 4H), 2.20 (br s, 2H).
d) N-[1-(5-Bromo-2-fluoro-phenyl)-2-hydroxy-1-hydroxymethyl-ethyl]-2-chloro-acetamide
A solution of chloro-acetyl chloride (6.39 ml, 80 mmol) in 10 ml ACN was added dropwise to a mixture of 2-amino-2-(5-bromo-2-fluoro-phenyl)-propane-1,3-diol (5.3 g, 20 mmol) and K2CO3 (11.1 g, 80 mmol) in 90 ml ACN while the temperature did not rise above 35° C. The mixture was stirred for 2 h. MeOH (40 ml, 99 mmol) were added and after 5 min stirring the mixture was filtered over celite and washed with MeOH. The filtrate was acidified with citric acid solution (10%, aqueous) (pH 4-5) and partly evaporated. The remaining aqueous layer was extracted with EtOAc. The organic layer was washed with NaHCO3 solution (10%, aqueous) and brine, dried with Na2SO4 and evaporated to provide the title compound as an off-white solid.
TLC (Hex: EE/1:1) Rf 0.23
HPLC: RtH4=1.966 min; ESIMS [M+H]+=340, 342 (1 Br);
1H-NMR (DMSO, 360 MHz): 8.19 (s, 1H), 7.47 (dd, 1H), 7.10 (dd, 1H), 5.00 (t, 2H), 4.19 (s, 2 H), 3.98-3.81 (m, 4H).
e) 5-(5-Bromo-2-fluoro-phenyl)-5-hydroxymethyl-morpholin-3-one
A mixture of N-[1-(5-bromo-2-fluoro-phenyl)-2-hydroxy-1-ydroxymethyl-ethyl]-2-chloro-acetamide (6.34 g, 18.62 mmol) and potassium tert.-butoxide (2.09 g, 18.62 mmol) in 62 ml t-BuOH was refluxed for 30 min. 19 ml 1 N HCl and water were added and the aqueous layer was extracted with EtOAc. The organic layer was washed with brine, dried with MgSO4 and evaporated. The crude product was recrystallized in Hex/EtOAc to provide the title compound as an off-white solid.
TLC (Hex: EE/1:2) Rf 0.25
HPLC: RtH4=1.885 min; ESIMS [M+H]+=304, 306 (1 Br);
1H-NMR (DMSO, 360 MHz): 8.49 (s, 1H), 7.62-7.56 (m, 2H), 7.21 (dd, 1H), 5.25 (t, 1H), 4.15 (d, 1H), 4.02 (s, 2H), 3.91 (d, 1H), 3.79-3.62 (m, 2H).
f) 5-(5-Bromo-2-fluoro-phenyl)-5-fluoromethyl-morpholin-3-one
To a solution of 5-(5-bromo-2-fluoro-phenyl)-5-hydroxymethyl-morpholin-3-one (1.6 g, 5.26 mmol) in 30 ml THF was added dropwise diethylaminosulfur trifluoride (0.97 ml, 7.34 mmol) and stirred for 2 h. The colorless solution was slowly added to an ice cooled Na2CO3 solution (10%,aqueous) and extracted with TBME. The organic layer was washed with brine, dried with MgSO4 and evaporated. The crude product was purified by chromatography on silica gel (heptane/EtOAc 3/1) to provide the title compound as a slightly yellow solid.
TLC (Hex: EE/1:1) Rf 0.43
HPLC: RtH4=2.136 min; ESIMS [M+H]+=306, 308 (1 Br);
1H-NMR (CDCl3, 360 MHz): 7.50-7.40 (m, 2H), 6.95 (dd, 1H), 6.55 (s, 1H), 4.86-4.58 (m, 2 H), 4.22-4.11 (m, 2H), 4.07-3.98 (m, 2H).
g) [5-(5-Amino-2-fluoro-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
This compound was obtained from 5-(5-bromo-2-fluoro-phenyl)-5-fluoromethyl-morpholin-3-one by a similar sequence as described for example 42 steps g) to j).
TLC (Hex: EE/1:1) Rf 0.38
HPLC: RtH2=2.778 min; ESIMS [M+H]+=342;
1H-NMR (DMSO, 360 MHz, broad signals due to rotamers): 9.79 (s, 1H), 6.82 (br t, 1H), 6.70-6.62 (m, 1H), 6.51-6.43 (m, 1H), 4.92 (s, 2H), 4.70-4.38 (m, 4H), 3.95-3.81 (m, 2H), 1.43 (s, 9H).
h) [(R)-5-(5-Amino-2-fluoro-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
The racemic product [5-(5-amino-2-fluoro-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester was separated via prep-HPLC on Chiralpak AD 20 μm 5×50×100 mm (5×SMB columns) (Flowrate: 65 ml/min; Detection UV: 220 nm). The desired compound was the slower eluting (R)-enantiomer.
Purity: 99.0% ee
[α]D=−140° (c=1, CHCl3).
i) ((R)-5-{5-[(5-Chloro-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
[(R)-5-(5-Amino-2-fluoro-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (75 mg, 0.22 mmol), 5-chloro-pyridine-2-carboxylic acid (38.1 mg, 0.242 mmol), HOAt (38.9 mg, 0.286 mmol), EDC (63.2 mg, 0.33 mmol) and Et3N (77 μl, 0.549 mmol) were dissolved in CH2Cl2 and stirred for 14 h. The solution was evaporated and the crude product was purified by chromatography on silica gel (heptane/EtOAc 6/1) to provide the title compound as a white solid.
TLC (Hex: EE/2:1) Rf 0.46
HPLC: RtH1=2.668 min; ESIMS [M+H]+=481, 483 (1 Cl);
1H-NMR (DMSO, 360 MHz, broad signals due to rotamers): 9.79 (br s, 1H), 8.50 (s, 1H), 8.29 (d, 1H), 7.90-7.85 (m, 1H), 7.81 (dd, 1H), 7.65-7.55 (br m, 1H), 7.10-7.00 (m, 1H), 4.75-4.45 (br m, 4H), 4.19 (d, 1H), 3.91-3.81 (1H), 1.46 (br s, 9H).
j) 5-Chloro-pyridine-2-carboxylic acid [3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride
A solution of ((R)-5-{5-[(5-chloro-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (106 mg, 0.22 mmol), 4 N HCl/Dioxan (1.1 ml, 4.41 mmol) and 3 N HCl/MeOH in CH2Cl2 was stirred for 15 h at room temperature and for 2 h at 40° C. to complete the conversion. The yellow solution was evaporated and taken up in MeOH. TBME was added and the white precipitate was filtered off to provide the title compound.
HPLC: RtH2=3.033 min; ESIMS [M+H]+=381, 383 (1 Cl);
1H-NMR (DMSO, 360 MHz): 11.90 (s, 1H), 11.85 (br s, 1H), 9.50 (br s, 1H), 8.83-8.80 (m, 1H), 8.25-8.15 (m, 2H), 8.10-8.01 (m, 2H), 7.40-7.32 (m, 2H), 5.08-4.97 (m, 1H), 4.95-4.82 (m, 1H), 4.71-4.60 (m, 1H), 4.20-4.10 (m, 1H).
Examples 86 to 95
The compounds listed in Table 12 can be prepared by a procedure analogous to that used in example 85, using the racemic [5-(5-amino-2-fluoro-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester [example 85 step g)] or [(R)-5-(5-amino-2-fluoro-phenyl)-5-fluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester [example 85 step g)].










TABLE 12








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







86




10.95-10.85 (m, 2H), 9.62-9.51 (m, 1H), 8.89 (s, 1H), 8.80-8.75 (m, 1H), 8.35 (dd, 1H), 8.30 (d, 1H), 8.08-8.05 (m, 1H), 8.04-8.02 (m, 1H),  7.37-7.31 (m, 1H), 5.00-4.85 (m, 1H), 4.70-4.59 (m, 1H), 4.18-4.05 (m, 1H)
425, 427



5-Bromo-pyridine-2-carboxylic acid





[3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


87




10.95-10.90 (m, 2H), 9.60-9.55 (m, 1H), 8.81-8.78 (m, 2H), 8.23-8.21 (m, 1H), 8.18 (d, 1H), 8.08-8.05 (m, 1H), 8.04-8.02 (m, 1H),  7.37-7.32 (m, 1H), 5.00-4.70 (m, 2H), 4.69-4.59 (m, 2H), 4.19-4.09 (m, 2H)  
381, 383



5-Chloro-pyridine-2-carboxylic acid





[3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


88




11.02-10.95 (m, 2H), 9.60 (s, 1H), 8.85 (s, 1H), 8.74 (s, 1H), 8.47 (s, 1H), 7.94-7.87 (m, 1H), 7.85-7.79 (m, 1H), 7.40-7.32 (m, 1H), 5.02-4.83 (m, 2H), 4.69-4.59 (m, 2H), 4.19-4.07 (m, 2H) 
415, 417



3,5-Dichloro-pyridine-2-carboxylic acid





[3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


89




11.07 (s, 1H), 10.88 (s, 1H), 9.53 (s, 1H), 9.21 (s, 1H), 8.74 (s, 1H), 8.60 (dd, 1H), 8.30 (d, 1H), 8.10-8.03 (m, 2H), 7.40-7.32 (m, 1H), 5.03-4.83 (m, 2H), 4.69-4.58 (m, 2H), 4.17-4.08 (m, 2H)
372



5-Cyano-pyridine-2-carboxylic acid





[3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


90




10.89 (s, 1H), 10.78 (s, 1H), 9.54 (s, 1H), 8.77 (s, 1H), 8.67 (s, 1H), 8.18 (s, 1H), 8.00-7.96 (m, 1H), 7.90 (dd, 1H), 7.37-7.29 (m, 1H), 5.01-4.82 (m, 2H), 4.69-4.58 (m, 2H), 4.17-4.08 (m, 2H), 2.55 (s, 3H)
439, 441



5-Bromo-3-methyl-pyridine-2-carboxylic acid 





[3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


91




10.84 (s, 1H), 10.78 (s, 1H), 9.54-9.46 (m, 1H), 8.73-8.66 (m, 2H), 8.22-8.19 (m, 1H), 8.03-7.96 (m, 1H), 7.96-7.90 (m, 1H), 7.40-7.30 (m, 1H), 5.08-4.95 (m, 1H), 4.95-4.82 (m, 1H), 4.72-4.59 (m, 2H), 4.20-4.10 (m, 2H), 2.58 (s, 3H)
439, 441 



5-Bromo-3-methyl-pyridine-2-carboxylic acid 





[3-(5-amino-3-fluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


92




10.51 (s, 1H), 8.55 (d, 1H), 8.00 (d, 1H), 7.91 (dd, 1H), 7.79-7.73 (m, 1H), 7.15-7.08 (m, 1H), 5.90 (s, 2H), 4.55-4.48 (m, 1H), 4.43-4.36 (m, 1H), 4.00-3.77 (m, 4H), 2.53 (s, 3H)
395, 397



5-Chloro-3-methyl-pyridine-2-carboxylic acid 





[3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-





2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


93




10.85 (d, 1H), 10.78 (s, 1H), 9.50 (d, 1H), 8.71 (d, 1H), 8.01-7.95 (m, 1H), 7.95-7.88 (m, 1H), 7.37-7.30 (m, 1H), 5.03-4.89 (m, 2H), 4.69-4.58 (m, 2H), 4.18-4.08 (m, 2H)
400, 402



5-Chloro-4,6-dideutero-3-trideuteromethyl-pyridine-





2-carboxylic acid





[3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


94




12.25-12.12 (m, 1H), 11.14 (s, 1H), 10.92-10.83 (m, 1H), 9.58-9.47 (m, 1H), 8.79-8.68 (m, 1H), 8.39 (d, 1H), 8.04-7.93 (m, 2H), 7.91 (d, 1H), 7.45-7.34 (m, 1H), 5.08-4.95 (m, 1H), 4.95-4.81 (m, 1H), 4.72-4.58 (m, 2H), 4.21-4.09 (m, 2H)
441, 443



5-Bromo-3-hydroxy-pyridine-2-carboxylic acid 





[3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


95




10.48 (s, 1H), 8.35 (d, 1H), 7.96 (d, 1H), 7.91-7.85 (m, 1H), 7.79-7.71 (m, 1H), 7.19-7.08 (m, 1H), 5.92 (s, 2H), 4.59-4.52 (m, 1H), 4.46-4.39 (m, 1H), 4.05-3.80 (m, 7H)
455, 457



5-Bromo-3-methoxy-pyridine-2-carboxylic acid 





[3-((R)-5-amino-3-fluoromethyl-3,6-dihydro-





2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide









Example 96
5-Bromo-pyridine-2-carboxylic acid[3-((S)-3-amino-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide hydrochloride




a) 1-(5-Bromo-2-fluoro-phenyl)-2,2-difluoro-ethanone
A solution of diisopropyl amine (17.77 ml, 126 mmol) in 320 ml THF was cooled to −75° C. and brought under N2 atmosphere. A 1.6 M solution of BuLi in hexane (79 ml, 126 mmol) was added. When the LDA solution had cooled down again, 1-fluoro-4-bromobenzene was added. The reaction temperature was kept below −60° C. After 2.5 h ethyl difluoro acetate (15.60 g, 126 mmol) was added rapidly and after 15 minutes, the reaction mixture was warmed to −40° C. After 15 minutes the mixture was quenched by pouring it on ice-cold 1N HCl. The mixture was extracted with petroleum ether (B.p. 40-60° C.) and the extract was dried with MgSO4.H2O. Chromatography on silica gel with hexane/TBME 9/1→6/1 gave 22.1 g yellow liquid.
Rf (hexanes/EtOAc 6/1)=0.28
1H-NMR (CDCl3, 360 MHz): 8.09 (dd, 1H), 7.79 (ddd, 1H), 7.17 (t, 1H), 6.44 (t, J=45 Hz, 1H).
b) [1-(5-Bromo-2-fluoro-phenyl)-2,2-difluoro-eth-(Z)-ylidene]-carbamic acid tert-butyl ester
A suspension of 1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-ethanone (16.0 g, 63.2 mmol) and N-(triphenylphosphoranylidene)-carbamic acid 1,1-dimethylethyl ester (CAS 68014-21-1) (26.3 g, 69.6 mmol) in 12 ml toluene was stirred at 100° C. for 2 days. The suspension became clear. After being cooled down somewhat, hexane was added till crystallization of triphenylphosphine oxide started. The mixture was filtered and the filtrate was purified by chromatography on silica gel with hexane/TBME 1-5% to give 11.37 g of the title compound as a yellow liquid.
Rf (hexane/EtOAc 6/1)=0.65
1H-NMR (DMSO-d6, 360 MHz): 7.88 (dd, 1H), 7.71 (br, 1H), 7.47 (t, 1H), 6.88 (br t, J=54 Hz, 1H), 1.29 (br s, 9H).
c) [1-(5-Bromo-2-fluoro-phenyl)-1-difluoromethyl-but-3-enyl]-carbamic acid tert-butyl ester
To a solution of [1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-eth-(Z)-ylidene]-carbamic acid tert-butyl ester (9.61 g, 27.3 mmol) in 114 ml THF at −75° was added dropwise allylmagnesium chloride solution 2 mol/L in THF (15.0 ml, 30 mmol). The reaction temperature was not allowed to exceed −60° C. After 10 minutes the reaction was quenched with 10% aqueous NH4Cl and extracted with TBME. The organic phase was washed with brine, dried with Na2SO4 and evaporated. The crude product was chromatographed on silica gel with 1-5% TBME/hexane to give 10.39 g of the title compound.
HPLC: RtH3=3.449 min; ESIMS [M+Na]+=416, 418 (1 Br);
1H-NMR (CDCl3, 360 MHz): 7.45 (dd, 1H), 7.35 (ddd, 1H), 6.88 (dd, 1H), 6.28 (t, J=54 Hz), 1H), 5.72-5.60 (m, 1H), 5.13 (d, 1H), 5.12 (d, 1H), 5.00 (br s, 1H), 3.00-2.80 (m, 2H), 1.32 (br s, 9H).
d) [1-(5-Bromo-2-fluoro-phenyl)-1-difluoromethyl-3-hydroxy-propyl]-carbamic acid tert-butyl ester
A suspension of [1-(5-bromo-2-fluoro-phenyl)-1-difluoromethyl-but-3-enyl]-carbamic acid tert-butyl ester (5.11 g, 12.96 mmol) and NaHCO3 (1.63 g, 19.44 mmol) in 90 ml DCM and 30 ml MeOH was cooled to −75° C. A mixture of O3 in oxygen gas was introduced till the blue color persisted. The excess ozone was removed by bubbling through oxygen gas for 10 minutes. NaBH4 (0.981 g, 25.9 mmol) was added as a solid in three portions. The mixture was stirred 10 min at −75° C. and then allowed to warm to 0° C. After 30 min the mixture was poured onto ice-cold 1N HCl and extracted with TBME. The organic phase was washed with 1N HCl, brine, dried with MgSO4.H2O and evaporated. Chromatography on silica gel (hexanes/15-35% EtOAc) provided 4.75 g of the title compound as a colorless resin.
HPLC: RtH6=2.359 min; ESIMS [M+Na]+=420, 422 (1 Br);
1H-NMR (DMSO-d6, 360 MHz): 7.68 (br, 1H), 7.60-7.54 (m, 1H), 7.47 (dd, 1H), 7.20 (dd, 1H), 6.57 (t, J=54 Hz, 1H), 4.77 (t, 1H), 3.52-3.34 (m, 2H), 2.29 (br s, 2H), 1.36 (br, s, 9H).
e) N-[1-(5-Bromo-2-fluoro-phenyl)-1-difluoromethyl-3-hydroxy-propyl]-2-chloro-acetamide
[1-(5-Bromo-2-fluoro-phenyl)-1-difluoromethyl-3-hydroxy-propyl]-carbamic acid tert-butyl ester (4.75 g, 11.93 mmol) was dissolved in 89 ml 4N HCl in dioxane. The mixture was stirred 1 h and evaporated to give 4.2 g of a white solid. The solid was suspended in 60 ml ACN and K2CO3 (6.59 g, 7.7 mmol) was added. The stirred suspension was cooled to 0° C. and chloroacetyl chloride (4.04 g, 35.8 mmol) was added dropwise. The mixture was stirred at 25° C. overnight. The mixture was diluted with TBME, washed with water and brine, dried with MgSO4.H2O and evaporated to give 5.25 g of the crude diacylated product. This crude intermediate was dissolved in 60 mL of MeOH and K2CO3 (330 mg, 2.39 mmol) was added. After 30 minutes, the reaction mixture was partitioned between water and TBME. The layers were separated and washed with brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/EtOAc 4/1→3/1→2/1. Pure fractions were combined and evaporated to give 3.81 g of the title compound as a colorless resin.
HPLC: RtH3=3.097 min; ESIMS [M+Na]+=374, 376 (1 Br);
1H-NMR (CDCl3, 360 MHz): 8.56 (br, s, 1H), 7.53 (dd, 1H), 7.49-7.43 (m, 1H), 6.99 (dd, 1H), 6.79 (t, J=54 Hz, 1H), 4.14-4.02 (m, 3H), 3.88-3.79 (m, 1H), 2.45 (t, 2H), 1.19 (d, 1H).
f) 5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-[1,4]oxazepan-3-one
To a refluxing solution of potassium tert-butylate (1.63 g, 14.52 mmol) in 555 ml t-BuOH was added dropwise a solution of) N-[1-(5-bromo-2-fluoro-phenyl)-1-difluoromethyl-3-hydroxy-propyl]-2-chloro-acetamide (2.72 g, 7.26 mmol) in 45 ml THF over a period of 40 minutes. The reaction mixture was cooled down and quenched with 1N HCl. EtOAc was added and the organic layer was washed with brine, dried with Na2SO4 and evaporated. The crude product was crystallized from DCM/TBME to provide the title compound as white crystals.
HPLC: RtH3=2.989 min; ESIMS [M+H]+=338, 340 (1 Br);
1H-NMR (DMSO-d6, 360 MHz): 8.38 (s, 1H), 7.70-7.63 (m, 2H), 7.29 (dd, 1H), 6.20 (t, J=54 Hz, 1H), 4.17 (d, 1H), 4.04 (d, 1H), 3.80-3.73 (m, 1H), 3.45-3.34 (m, 1H), 2.73-2.56 (m, 2H).
g) [5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl]-carbamic acid tert-butyl ester
This compound was obtained from 5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-[1,4]oxazepan-3-one by a similar sequence as described for example n75 step c) and example 42 steps g) to j) as a colorless foam.
HPLC: RtH3=2.410 min; ESIMS [MH+H2O]+=392,
RtH3=2.595 min; ESIMS [MH]+=374;
1H-NMR (CDCl3, 360 MHz, broad signals due to rotamers): 11.09 (s, 1H), 6.96-6.88 (dd, 1H), 6.71-6.62 (m, 2H), 6.11 (t, J=54 Hz, 1H), 4.47-4.25 (m, 2H), 3.89-3.80 (m, 1H), 3.74-3.55 (m, 3H), 2.79-2.69 (m, 1H), 2.65-2.50 (m, 1H), 1.58 (s, 9H).
h) [(S)-5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl]-carbamic acid tert-butyl ester
Racemic [5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl]-carbamic acid tert-butyl ester (1.62 g, 4.04 mmol) was separated via a VWR prep HPLC System on a Chiralpak AD 20 um 4×50×100 (4×SMB columns) column; eluent: heptane/ethanol 70/30; flow=65 ml/min; UV detection at 220 nm. As a result, 754 mg of the desired title compound ((S)-isomer) was obtained as the first eluting isomer. Purity: >99.5% ee.
1H-NMR (CDCl3, 360 MHz, broad signals due to rotamers): 11.08 (s, 1H), 6.96-6.88 (dd, 1H), 6.71-6.63 (m, 2H), 6.11 (t, J=54 Hz, 1H), 4.47-4.26 (m, 2H), 3.89-3.81 (m, 1H), 3.80-3.56 (m, 3H), 2.78-2.70 (m, 1H), 2.64-2.51 (m, 1H), 1.58 (s, 9H).
[α]D=−166.5° (c=1, solvent ═CHCl3)
i) ((S)-5-{5-[(5-Cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl)-carbamic acid tert-butyl ester
A solution of [(S)-5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl]-carbamic acid tert-butyl ester (51.2 mg, 0.137 mmol), 5-cyano-2-pyridinecarboxylic acid (30.5 mg, 0.206 mmol) and HOAT (33.6 mg, 0.247 mmol) in 0.6 mL DMF was cooled to 0-5° C. EDC (39.4 mg, 0.206 mmol) and DIPEA (35.4 mg, 0.274 mmol) were added. The resulting solution was allowed to warm up to rt over night. The reaction mixture was then partitioned between saturated aqueous NaHCO3 solution and EtOAc. The layers were separated, washed with saturated aqueous NaHCO3 solution, brine and EtOAc. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/EtOAc 3/1→1.5/1 to give 67.7 mg of the title compound as a colorless resin.
HPLC: RtH1=2.492 min; ESIMS=[M+H]+ 504;
1H-NMR (CDCl3, 360 MHz, broad signals due to rotamers): 11.10 (s, 1H), 9.85 (s, 1H), 8.86 (s, 1H), 8.35 (d, 1H), 8.28-8.19 (m, 1H), 8.14 (dd, 1H), 7.32-7.25 (m, 1H), 7.10 (t, 1H), 6.08 (t, J=54 Hz, 1H), 4.43-4.15 (m, 2H), 3.80-3.71 (m, 1H), 3.59-3.42 (m, 1H), 2.74-2.65 (m, 1H), 2.62-2.47 (m, 1H), 1.49 (s, 9H).
j) 5-Bromo-pyridine-2-carboxylic acid[3-((S)-3-amino-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide hydrochloride
((S)-5-{5-[(5-Cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl)-carbamic acid tert-butyl ester (67.7 mg, 0.134 mmol) was dissolved in 0.75 mL dichloromethane and 0.25 mL trifluoroacetic acid. The solution was stirred at for 45 minutes and then evaporated at roomtemperature. The residue was dissolved in EtOAc and extracted with saturated aqueous NaHCO3 solution. The layers were washed with brine and EtOAc. The combined organic layers were dried over Na2SO4 and evaporated. The crude product was dissolved in THF, 0.2 mL HCl solution 1 mol/L in diethyl ether was added and the mixture was evaporated. The residue was crystallized from ethanol and TBME to give 48 mg of the title compound as white crystals.
HPLC: RtH3=2.629 min; ESIMS [M+H]+=404.0;
1H-NMR (DMSO, 600 MHz): 11.11 (s, 1H), 10.20 (s, 1H) 9.75 (s, 1H), 9.22 (s, 1H), 8.78 (s, 1H), 8.60 (d, 1H), 8.30 (d, 1H), 8.12-8.07 (m, 1H), 8.01-7.97 (m, 1H), 7.35 (dd, 1H), 6.55 (t, J=54 Hz, 1H), 4.77 (d, 1H), 4.52 (d, 1H), 3.89-3.83 (m, 1H), 3.50-3.39 (m, 1H), 2.79-2.68 (m, 2H).
Example 97
The compound listed in Table 13 can be prepared by a procedure analogous to that used in example 96, using 4N HCl in dioxane in step j).










TABLE 13








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







97




10.97 (s, 1H), 10.17 (s, 1H) 9.74 (s, 1H), 8.87 (s, 1H), 8.75 (s, 1H), 8.34 (d, 1H), 8.11-8.05 (m, 2H), 7.99-7.96 (m, 1H), 7.35 (dd, 1H), 6.54 (t, J = 54 Hz, 1H), 4.77 (d, 1H), 4.51 (d, 1H), 3.89-3.84 (m, 1H), 3.48-3.41 (m, 1H), 2.79-2.68 (m, 2H)
457, 459



5-Bromo-pyridine-2-carboxylic acid [3-((S)-3-





amino-5-difluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-





5-yl)-4-fluoro-phenyl]-amide hydrochloride









Example 98
5-Cyano-pyridine-2-carboxylic acid [3-(3-amino-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide hydrochloride




a) [2,2,2-Trifluoro-1-(2-fluoro-phenyl)-eth-(Z)-ylidene]-carbamic acid tert-butyl ester
A suspension of 1-(2-fluoro-phenyl)-2,2,2-trifluoro-ethanone (CAS 124004-75-7) (17.0 g, 88 mmol) and N-(triphenylphosphoranylidene)-carbamic acid 1,1-dimethylethyl ester (CAS 68014-21-1) (36.7 g, 97 mmol) in 17 ml toluene was stirred at 120° C. for 18 h. The suspension became clear. After being cooled down hexane was added till crystallization of triphenylphosphine oxide started. The mixture was filtered and the filtrate was purified by chromatography on silica gel with 1-5% TBME/hexanes to yield 11.37 g of a yellow liquid.
Rf (Hex/TBME 95/5)=0.18
HPLC: RtH6=3.168 min; ESIMS [M+Na]+=314,
1H-NMR (CDCl3, 360 MHz): 7.59-7.52 (m, 1H), 7.42-7.35 (m, 1H), 7.30-7.18 (m, 2H), 1.31 (s, 9H).
b) [1-(2-Fluoro-phenyl)-1-trifluoromethyl-but-3-enyl]-carbamic acid tert-butyl ester
To a solution of [2,2,2-Trifluoro-1-(2-fluoro-phenyl)eth-(Z)-ylidene]-carbamic acid tert-butyl ester (16.63 g, 57.1 mmol) in 170 mL THF at −75° was added dropwise allylmagnesium chloride solution 2 mol/L in THF (31.4 ml, 62.8 mmol).The reaction temperature was not allowed to exceed −60° C. After 30 minutes, the reaction was quenched with 10% aqueous NH4Cl and extracted with TBME. The organic phase was washed with brine, dried with MgSO4.H2O and evaporated. The crude product was chromatographed on silica gel with hexane/TBME 95/5 to give 18.52 g of the title compound.
HPLC: RtH3=3.296 min; ESIMS [M+Na]+=356;
1H-NMR (CDCl3, 360 MHz): 7.49 (t, 1H), 7.41-7.33 (m, 1H), 7.19 (t, 1H), 7.14-7.06 (dd, 1H), 5.92-5.78 (m, 2H), 5.30-5.19 (m, 2H), 3.37-3.18 (br, m, 2H), 1.40 (br, s, 9H).
c) [1-(2-Fluoro-phenyl)-3-hydroxy-1-trifluoromethyl-propyl]-carbamic acid tert-butyl ester
A suspension of [[1-(2-fluoro-phenyl)-1-trifluoromethyl-but-3-enyl]-carbamic acid tert-butyl ester (9.27 g, 27.8 mmol) and NaHCO3 (3.50 g, 41.7 mmol) in 168 ml DCM and 56 ml MeOH was cooled to −75° C. A mixture of O3 in oxygen gas was introduced till the blue color persisted. The excess ozone was removed by bubbling through oxygen gas for 10 minutes. Solid NaBH4 (2.10 g, 55.6 mmol) was added in two portions. The mixture was stirred 10 min at −75° C. and then allowed to warm to 0° C. After 30 minutes, the mixture was poured onto ice-cold 1N HCl and extracted with TBME. The organic phase is washed with 1N HCl, brine, dried with MgSO4.H2O and evaporated. Crystallization from hexane provided 7.83 g of the title compound as white crystals.
HPLC: RtH1=2.738 min; ESIMS [M+Na]+=360;
1H-NMR (DMSO-d6, 360 MHz): 7.82 (br, s, 1H), 7.46-7.35 (m, 2H), 7.27-7.17 (m, 2H), 4.79 (t, 1H), 3.51-3.36 (m, 2H), 2.48-2.31 (m, 2H), 1.32 (br, s, 9H).
d) 2-Chloro-N-[1-(2-fluoro-phenyl)-3-hydroxy-1-trifluoromethyl-propyl]-acetamide
[1-(2-Fluoro-phenyl)-3-hydroxy-1-trifluoromethyl-propyl]-carbamic acid tert-butyl ester (7.83 g, 23.21 mmol) was dissolved in 116 ml 4N HCl in dioxane. The mixture was stirred 1 h and evaporated to give 6.42 g of a white solid. The solid was dissolved in 65 ml dichloromethane and pyridine (11.3 mL, 139 mmol). The solution was cooled to −15° C. and chloroacetyl chloride (5.50 g, 48.7 mmol) was added dropwise. The temperature was kept below −5° C. Afterwards, the mixture was allowed to warm up to room temperature. After 40 minutes, the reaction mixture was partitioned between 1N HCl and TBME. The layers were separated, washed with brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on silica gel by eluting with hexane/EtOAc 3/1→2/1 to give 5.46 g of a mixture of diacylated and O-acylated product. This mixture was dissolved in 80 mL dichloromethane. DIPEA (15.8 mL, 90.70 mmol) was added and the reaction mixture was cooled to −75° C. and chloroacetyl chloride (9.89 g, 87.57 mmol) was added dropwise. Afterwards, the mixture was stirred without cooling bath for 15′. The reaction mixture was partitioned between 1N HCl and TBME. The layers were separated, washed with brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/EtOAc 3/1 to give 3.71 g of the diacylated compound.
In order to get the title compound, the diacylated compound was dissolved in 50 mL of MeOH and K2CO3 (657 mg, 4.76 mmol) was added. After 45 minutes, the reaction mixture was partitioned between water and TBME. The layers were separated, washed with brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silca gel column by eluting with hexane/EtOAc 3/1→2/1→1.5/1 to give 1.77 g of the title compound as a yellow resin.
HPLC: RtH3=2.889 min; ESIMS [M+H]+=314;
1H-NMR (DMSO-d6, 360 MHz): 9.10 (br, s, 1H), 7.48-7.39 (m, 2H), 7.27-7.17 (m, 2H), 4.77 (br, t, 1H), 4.25 (dd, 2H), 3.54-3.40 (m, 2H), 2.72-2.61 (m, 1H), 2.58-2.48 (m, 1H)
e) 5-(2-Fluoro-phenyl)-5-trifluoromethyl-[1,4]oxazepan-3-one
To a refluxing solution of potassium tert-butylate (1.31 g, 11.29 mmol) in 43 ml t-BuOH was added dropwise a solution of 2-chloro-N-[1-(2-fluoro-phenyl)-3-hydroxy-1-trifluoromethyl-propyl]-acetamide (1.77 g, 5.64 mmol) in 35 ml THF over a period of 60 minutes. The reaction mixture was cooled down and quenched with 1N HCl. EtOAc was added and the organic layer was washed with brine, dried with MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/EtOAc 3/1→2.5/1 to give 1.19 g of the title compound as white crystals.
HPLC: RtH3=2.943 min; ESIMS [M+H]+=278;
1H-NMR (CDCl3, 360 MHz): 7.58 (t, 1H), 7.51-7.44 (m, 1H), 7.33-7.27 (m, 1H), 7.18 (dd, 1H), 6.47 (br, s, 1H), 4.16 (dd, 2H), 4.00-3.91 (m, 1H), 3.82-3.72 (m, 1H), 3.19-3.11 (m, 1H), 2.81-2.68 (m, 1H).
f) 5-(2-Fluoro-phenyl)-5-trifluoromethyl-[1,4]oxazepane-3-thione
To a solution of 5-(2-fluoro-phenyl)-5-trifluoromethyl-[1,4]oxazepan-3-one (1.19 g, 4.29 mmol) in 15 mL THF was added Lawesson's reagent (955 mg, 2.36 mmol). The reaction mixture was stirred at room temperature over night. The mixture was then partitioned between aqueous Na2CO3 solution (2 mol/L) and TBME. The layers were separated, washed with aqueous Na2CO3 solution (2 mol/L), brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/EtOAc 95/5→90/10 to give 1.25 g of the title compound as a yellow resin.
HPLC: RtH3=2.620 min; ESIMS [M+H]+=294;
1H-NMR (CDCl3, 360 MHz): 8.42 (br, s, 1H), 7.54-7.45 (m, 2H), 7.35-7.27 (m, 1H), 7.20 (dd, 1H), 4.54 (dd, 2H), 4.05-3.97 (m, 1H), 3.84-3.74 (m, 1H), 3.17-3.08 (m, 1H), 2.85-2.73 (m, 1H).
g) 5-(2-Fluoro-phenyl)-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-ylamine
5-(2-Fluoro-phenyl)-5-trifluoromethyl-[1,4]oxazepane-3-thione (1.25 g, 4.26 mmol) was dissolved in NH3 solution 7 mol/L in methanol (27 mL, 128 mmol). The sealed reaction vessel was stirred over night at rt. The reaction mixture was evaporated, dissolved in TBME and extracted with 1N HCl. The layers were separated, washed with water and TBME. The aqueous layers were combined, basified by addition of solid K2CO3 and extracted with dichloromethane four times. The combined CH2Cl2 layers were dried over MgSO4.H2O and evaporated to give 1.12 g of the title compound as white crystals.
HPLC: RtH3=2.475 min; ESIMS [M+H]+=277;
1H-NMR (CDCl3, 360 MHz): 7.50 (t, 1H), 7.32-7.23 (m, 1H), 7.09 (t, 1H), 7.04-6.96 (m, 1H), 4.62 (br, s, 2H), 3.95 (m, 2H), 3.76 (d, 1H), 3.73-3.63 (m, 1H), 2.92-2.84 (m, 1H), 2.46-2.34 (m, 1H).
h) 5-(2-Fluoro-5-nitro-phenyl)-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-ylamine
To a solution of 5-(2-fluoro-phenyl)-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-ylamine (1.12 g, 4.05 mmol) in 12 mL concentrated sulfuric acid (95%) was added potassium nitrate (533 mg, 5.27 mmol) in two portions. The reaction mixture was stirred at rt for 30 minutes, it was then poured onto ice water and TBME was added. The layers were separated, washed with water and TBME. The combined aqueous layers were basified with solid Na2CO3 and extracted with EtOAc. The EtOAc layers were dried over MgSO4.H2O and evaporated to give 1.29 g of the title compound was a white solid.
HPLC: RtH3=2.433 min; ESIMS [M+H]+=322;
1H-NMR (DMSO-d6, 360 MHz): 8.47 (dd, 1H), 8.39-8.31 (m, 1H), 7.58 (dd, 1H), 6.48 (br, s, 2H), 4.23 (d, 1H), 3.96 (d, 1H), 3.93-3.85 (m, 1H), 3.55-3.45 (m, 1H), 2.85-2.76 (m, 1H), 2.61-2.53 (m, 1H).
i) [5-(2-Fluoro-5-nitro-phenyl)-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl]-carbamic acid tert-butyl ester
To a supension of 5-(2-fluoro-5-nitro-phenyl)-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-ylamine (1.29 g, 4.02 mmol) in 10 mL dichlormethane and 15 mL THF were added DIPEA (779 mg, 6.02 mmol) and di-tert-butyldicarbonate (1.14 g, 5.22 mmol). The reaction mixture was stirred over night and then heated to 40° C. for 24 h. Additional DIPEA (104 mg, 0.8 mmol) and di-tert-butyldicarbonate (175 mg, 0.8 mmol) were added. The mixture was stirred at 40° C. for another 8 h. The reaction mixture was then evaporated and purified on a silica gel column by eluting with hexane/TBME 9/1→7/1 to give 1.69 g of the title compound as a white foam.
HPLC: RtH1=3.445 min; ESIMS=[M-tBu]+366;
1H-NMR (CDCl3, 360 MHz): 8.41-8.34 (m, 1H), 8.30-8.24 (m, 1H), 7.39 (br, s, 1H), 7.28 (t, 1H), 5.12 (d, 1H), 4.52 (d, 1H), 3.90-3.78, (m, 2H), 3.05-2.97 (m, 1H), 2.71-2.59 (m, 1H), 1.53 (s, 9H).
j) [5-(5-Amino-2-fluoro-phenyl)-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl]-carbamic acid tert-butyl ester
A solution of [5-(2-fluoro-5-nitro-phenyl)-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl]-carbamic acid tert-butyl ester (1.69 g, 4.01 mmol) in 10 mL ethanol and 10 mL THF was brought under nitrogen atmosphere and 500 mg of 5% Pd on charcoal was added. The reaction mixture was then stirred under a hydrogen atmosphere (balloon) for 6 hours. Then it was filtered over celite and evaporated. The crude product was crystallized from hexane/TBME to give 1.38 g of the title compound as white crystals.
HPLC: RtH3=3.006 min; ESIMS=[M+H]+392;
1H-NMR (CDCl3, 360 MHz, broad signals due to rotamers): 7.01-6.86 (m, 1H), 6.76-6.62 (m, 2H), 4.96 (d, 1H), 4.58 (d, 1H), 4.31-4.18 (dd, 1H), 4.03-3.73 (m, 2H), 3.69 (s, 1H), 3.57 (s, 1H), 3.13-2.90 (dd, 1H), 2.70-2.46 (m, 1H), 1.58 (s, 9H).
k) (5-{5-[(5-Cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl)-carbamic acid tert-butyl ester
A solution of [5-(5-amino-2-fluoro-phenyl)-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl]-carbamic acid tert-butyl ester (50 mg, 0.128 mmol), 5-cyano-2-pyridinecarboxylic acid (28.4 mg, 0.192 mmol) and HOAT (31.3 mg, 0.230 mmol) in 0.5 mL DMF was cooled to 0-5° C. EDC (36.7 mg, 0.192 mmol) and DIPEA (33 mg, 0.256 mmol) were added. The resulting solution was allowed to warm up to rt over night. The reaction mixture was then partitioned between saturated aqueous NaHCO3 solution and EtOAc. The layers were washed with saturated aqueous NaHCO3 solution, brine and EtOAc. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/EtOAc 4/1→3/1 to give 63.3 mg of the title compound as a white solid.
HPLC: RtH1=2.426 min; ESIMS=[M+H2O]+540,
RtH1=3.177 min; ESIMS=[M+H]+522;
1H-NMR (CDCl3, 360 MHz, broad signals due to rotamers): 9.75 (s, 1H), 8.83 (s, 1H), 8.35 (d, 1H), 8.14 (dd, 1H), 8.03-7.95 (m, 1H), 7.48-7.39 (m, 1H), 7.06 (t, 1H), 4.94 (d, 1H), 4.46 (d, 1H), 4.19 (s, 1H), 3.92-3.63 (m, 2H), 3.08-2.85 (m, 1H), 2.69-2.43 (m, 1H), 1.42 (s, 9H).
l) 5-Cyano-pyridine-2-carboxylic acid [3-(3-amino-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide hydrochloride
(5-{5-[(5-Cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-trifluoromethyl-2,5,6,7-tetrahydro-[1,4]oxazepin-3-yl)-carbamic acid tert-butyl ester (63.3, 0.121 mmol) was dissolved in 0.68 mL dichloromethane and 0.23 mL trifluoroacetic acid. The solution was stirred at for 45 minutes and then evaporated at room temperature. The residue was dissolved in EtOAc and extracted with saturated aqueous NaHCO3 solution. The layers were washed with brine and EtOAc. The combined organic layers were dried over Na2SO4 and evaporated. The crude product was dissolved in THF, 0.3 mL HCl solution 1 mol/L in diethyl ether was added and the mixture was evaporated. The residue was crystallized from wet ethanol and TBME to give 52.4 mg of the title compound as white crystals.
HPLC: RtH3=2.814 min; ESIMS [M+H]+=422;
1H-NMR (DMSO, 600 MHz): 11.15 (s, 1H), 10.73 (s, 1H) 9.95 (s, 1H), 9.22 (s, 1H), 8.95 (s, 1H), 8.60 (d, 1H), 8.29 (d, 1H), 8.12-8.06 (m, 2H), 7.40 (dd, 1H), 4.76 (d, 1H), 4.49 (d, 1H), 3.98-3.93 (m, 1H), 3.69-3.62 (m, 1H), 2.99-2.92 (s, broad, 2H).
Example 99
The compound listed in Table 14 can be prepared by a procedure analogous to that used in example 98, using 4N HCl in dioxane in step l).










TABLE 14








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







99




11.01 (s, 1H), 10.71 (s, 1H) 9.93 (s, 1H), 8.93 (s, 1H), 8.88 (s, 1H), 8.34 (d, 1H), 8.11-8.05 (m, 3H), 7.39 (dd, 1H), 4.76 (d, 1H), 4.48 (d, 1H), 3.98-3.93 (m, 1H), 3.69-3.61 (m, 1H), 2.97-2.92 (s, broad, 2H)
475, 477



5-Bromo-pyridine-2-carboxylic acid





[3-(3-amino-5-trifluoromethyl-





2,5,6,7-tetrahydro-[1,4]oxazepin-5-





yl)-4-fluoro-phenyl]-amide hydrochloride









Example 100
N-(3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-1,4-oxazepin-5-yl)-4-fluorophenyl)-5-chloropicolinamide




a) Ethyl 3-(5-bromo-2-fluorophenyl)-2,2-difluoro-3-hydroxypropanoate
To an ice cooled solution of 5-bromo-2-fluorobenzaldehyde (10.0 g, 49.2 mmol) in dry DMF (14 mL), Indium powder (8.48 g, 73.7 mmol) was added and stirred for 15 min. ethylbromodifluoroacetate (9.48 ml [14.98 g], 73.7 mmol) in dry DMF (10 mL) was added to the resultant reaction mixture and temperature of the reaction mixture was allowed to warm to rt (30° C.). Stirring continued for 24 h. TLC analysis of the reaction mixture indicated the product formation. Reaction mixture was treated with aqeous saturated NH4Cl solution and the crude product was extracted with ethyl acetate (500 mL) by washing with water, brine and the organic layer was dried over anhydrous Na2SO4. The organic layer was concentrated and the crude product was purified by column chromatography on silica gel using 4% Ethyl acetate in Hexane to obtain title compound as a colorless thick liquid. Yield=12.0 g (75%). TLC (5% ethyl acetate in Hexane: Rf=0.2),
1H NMR (400 MHz, CDCl3) δ 7.75-7.68 (m, 1H), 7.52-7.45 (m, 1H), 6.98 (t, 1H, J=7 Hz), 5.52 (dt, 1H, J=10 Hz, 4 Hz), 4.37 (q, 2H, J=5 Hz), 2.9 (d, 1H), 1.35 (t, 3H).
b) 1-(5-bromo-2-fluorophenyl)-2,2-difluoropropane-1,3-diol
To a solution of ethyl 3-(5-bromo-2-fluorophenyl)-2,2-difluoro-3-hydroxypropanoate (20.0 g, 61.3 mmol) in MeOH (160 mL), NaBH4 (7.0 g, 184.2 mmol) was added portion wise over a period of 30 min. at 0° C. Stirring was continued for 1 h at 0° C. and reaction was monitored by TLC. Upon complete consumption of the starting material, reaction mass was concentrated under reduced pressure and treated with saturated ammonium chloride solution. The crude reaction mass was dissolved in ethyl acetate and organic layer was washed with brine (15 mL) followed by drying over anhydrous Na2SO4. The organic layer was concentrated under reduced pressure to furnish title compound with sufficient purity. Yield=17 g (97%). TLC (50% ethyl acetate in Hexane): Rf=0.32),
LCMS: RtH8=0.665, [M−H]+=283.0, 283.9,
1H NMR (400 MHz, CDCl3) δ 7.76-7.70 (m, 1H), 7.51-7.42 (m, 1H), 6.90 (t, 1H, J=8.0 Hz), 5.42 (dd, 1H J=8.2 Hz, 4.0 Hz), 4.15-3.81 (m, 2H), 3.0 (s, 1H), 2.26 (s, 1H).
c) 1-(5-bromo-2-fluorophenyl)-3-(tert-butyldimethylsilyloxy)-2,2-difluoropropan-1-ol
To an ice cooled solution of 1-(5-bromo-2-fluorophenyl)-2,2-difluoropropane-1,3-diol (17.0 g, 59.8 mmol) in dry DCM (200 mL) was added imidazole (12.2 g, 179.2 mmol) at 0° C. and stirred for 15 min. tert-butyldimethylsilylchloride (13.5 g, 89.5 mmol) was added to the resultant reaction mixture portion wise for a period of 30 min. and stirring continued for 2 h. Reaction was monitored by TLC analysis. The solids formed in the reaction mixture were separated by filtration and filtrate was concentrated under reduced pressure to obtain crude product which was puirified by column chromatography on silica gel with 2% Ethylacetate in Hexane as eluent to furnish title compound as a colorless liquid. Yield=19 g (80%). TLC (20% ethyl acetate in Hexane): Rf=0.75),
LCMS: RtH8=2.09, [M+H]+=399.0,
1H NMR (300 MHz, CDCl3) δ 7.77-7.69 (m, 1H), 7.48-7.39 (m, 1H), 6.96 (t, 1H, J=9 Hz), 5.41 (dt, 1H, J=14 Hz, 3.4 Hz), 4.1-3.8 (m, 2H), 3.22 (d, 1H, J=5.2 Hz), 0.93 (s, 9.1H), 0.16 (s, 6H).
d) 1-(5-bromo-2-fluorophenyl)-3-(tert-butyldimethylsilyloxy)-2,2-difluoropropan-1-one
A mixture of 1-(5-bromo-2-fluorophenyl)-3-(tert-butyldimethylsilyloxy)-2,2-difluoropropan-1-ol (19.0 g, mmol) and Pyridinium dichromate (90.0 g, 239.2 mmol) in Dichloromethane (200 mL) was refluxed for 16 h under constant stirring. The catalyst was filtered through a pad of celite and the filtrate was concentrated under reduced pressure to obtain brown colored thick mass. Crude product was purified by column chromatography on silica gel with 1% ethyl acetate in Hexane to obtain title compound as colorless oil. Yield=17.0 g (90%). TLC (10% ethyl acetate in Hexane): Rf=0.56),
LCMS: RtH8=1.917, [M+H]+=396.7, 398.6,
1H NMR (300 MHz, CDCl3) δ 7.91-7.85 (m, 2H), 7.71-7.62 (m, 1H), 7.08 (t, 1H, J=8.5 Hz), 4.12 (t, 1H, J=11.5 Hz), 0.83 (s, 9H), 0.4 (6H).
e) N-(1-(5-bromo-2-fluorophenyl)-3-(tert-butyldimethylsilyloxy)-2,2-difluoropropylidene)-2-methylpropane-2-sulfinamide
To a solution of 1-(5-bromo-2-fluorophenyl)-3-(tert-butyldimethylsilyloxy)-2,2-difluoropropan-1-one (16.0 g, 40.4 mmol) in dry THF (350 mL) was added Ti(OEt)4 (16.7 mL, 80.4 mmol) and 2-Methyl-2-propane sulfonamide (5.8 g, 48.4 mmol) and refluxed for 16 h. Reaction mixture was concentrated under reduced pressure and the crude residue was directly purified by column chromatography on silica gel with 3% ethyl acetate in Hexane to furnish title compound as a colorless liquid. Yield=13.1 g (65.5%). TLC (10% ethyl acetate in Hexane): Rf=0.2),
LCMS RtH8=2.29 [M+H]+=499.9, 501.8,
1H NMR (300 MHz, CDCl3) δ 7.48-7.29 (m, 2H, 6.98 (m, 1H), 4.10 (t, 1H), 1.23 (d, 9H), 0.96 (d, 9H), 0.5 (d, 6H).
f) N-(2-(5-bromo-2-fluorophenyl)-4-(tert-butyldimethylsilyloxy)-3,3-difluorobutan-2-yl)-2-methylpropane-2-sulfinamide
To a solution of N-(1-(5-bromo-2-fluorophenyl)-3-(tert-butyldimethylsilyloxy)-2,2-difluoro-propylidene)-2-methylpropane-2-sulfinamide (12 g, 24.04 mmol) in diethyl ether (120 mL) was added CH3MgBr (3M in Diethyl ether) (41 mL, 120 mmol) at −25° C. The reaction mixture was brought to 0° C. and maintained for 30 min. Reaction mixture was again cooled to −35° C. and quenched by drop wise addition of saturated ammonium chloride solution. Organic layer was separated and washed with brine and dried over anhydrous sodium sulphate. Crude compound was purified by column chromatography on silica gel with 8% ethyl acetate in Hexane to furnish title compound as a colorless liquid. Yield=8.8 g (71%). TLC (20% ethyl acetate in Hexane): Rf=0.33),
LCMS: RtH8=2.161 [M+H]+=516.1, 519.0,
1H NMR (300 MHz, CDCl3) δ 7.71-7.62 (m, 1H), 7.44-7.38 (m, 1H), 7.0-6.84 (m, 1H), 4.82 (d, 1H), 4.05-3.9 (m, 2H), 2.06 (s, 3H), 1.25 (s, 9H), 0.9 (s, 9H), 0.11 (s, 6H).
g) 3-amino-3-(5-bromo-2-fluorophenyl)-2,2-difluorobutan-1-ol
To a solution of N-(2-(5-bromo-2-fluorophenyl)-4-(tert-butyldimethylsilyloxy)-3,3-difluorobutan-2-yl)-2-methylpropane-2-sulfinamide (8.8 g, 17.08 mmol) in dry MeOH (60 mL), dry HCl gas was purged for 30 min at −22° C. Reaction mixture was concentrated under reduced pressure and basified with NH4OH solution under cooling. Product was extracted with dichloromethane, washed with brine, dried over anhydrous Na2SO4 and concentrated under reduced pressure to furnish title compound as a color less thick liquid. Yield=4.4 g (88%). TLC (50% ethyl acetate in Hexane): Rf=0.35),
LCMS: RtH8=0.118 [M+H]+=298.0, 299.9,
1H NMR (300 MHz, CDCl3) δ 7.68-7.59 (m, 1H), 7.48-7.39 (m, 1H), 6.99 (dd, 1H, J=9 Hz, 4.5 Hz), 4.1-3.69 (m, 3H), 1.8 (s, 3H).
h) N-(2-(5-bromo-2-fluorophenyl)-3,3-difluoro-4-hydroxybutan-2-yl)-2-chloroacetamide
To an ice cooled solution of 3-amino-3-(5-bromo-2-fluorophenyl)-2,2-difluorobutan-1-ol (3.1 g, 10.4 mmol), in DCM (60 ml) was added aqueous Na2CO3 (2.74 g, 25.8 mmol in 7.0 mL H2O) and stirred for 10 min. Chloroacetyl chloride (0.986 ml, 11.4 mmol) was then added to the resultant reaction mixture and stirring continued for 30 min at 0° C. Upon formation of the new product by TLC analysis, K2CO3 (1.5 g, 10.4 mmol) in MeOH (17 mL) was added to the reaction mixture and stirred at rt for 30 min. The reaction mixture was diluted with DCM, separated the organic layer and washed successively with water and brine solution, dried over anhydrous Na2SO4 and concentrated under reduced pressure to furnish title compound as a colorless gum. Yield=3.3 g (78.5%).
TLC (50% ethyl acetate in Hexane): Rf=0.55),
LCMS: RtH9=1.287 [M+H]+=374.0, 375.9,
1H NMR (300 MHz, CDCl3) δ 8.28 (s, 1H), 7.53-7.38 (m, 2H), 6.92 (dd, 1H, J=11 Hz, 7.5 Hz), 4.11-3.78 (m, 2H), 2.49 (t, 1H, J=7.4 Hz), 2.08 (d, 3H).
i) 5-(5-bromo-2-fluorophenyl)-6,6-difluoro-5-methyl-1,4-oxazepan-3-one
To a solution of t-BuOK (0.36 g, 3.2 mmol) in t-BuOH (10 mL) was added N-(2-(5-bromo-2-fluorophenyl)-3,3-difluoro-4-hydroxybutan-2-yl)-2-chloroacetamide (1.0 g, 2.6 mmol) t-BuOH (10 mL) at rt and heated to reflux temperature for 1 h 30 min. Reaction mixture was monitored by TLC analysis. Reaction mixture was concentrated under reduced pressure and adjusted pH to  ̃2 using 2 N HCl. Ethyl acetate was added to extract the product, organic layer was washed with water, brine solution followed by drying over anhy. Na2SO4 and concentrated under reduced pressure. The crude compound (0.9 g) was carried forward for the next step without purification. LCMS: RtH8=1.616 [M+H]+=337.8, 339.9 (56%); 1.482 [M+H]+=675.1, 676.8 (34%).
j) 5-(5-bromo-2-fluorophenyl)-6,6-difluoro-5-methyl-1,4-oxazepane-3-thione
To a solution of 5-(5-bromo-2-fluorophenyl)-6,6-difluoro-5-methyl-1,4-oxazepan-3-one (2.0 g, 5.93 mmol) in THF (25 mL) was added Lawesson's reagent (2.87 g, 7.1 mmol) at rt and heated to reflux temperature for 16 h. Reaction mixture was concentrated under reduced pressure and directly purified by column chromatography on silica gel using 4% ethyl acetate in Hexane to furnish title compound as colorless gum. Yield=1.0 g (50%). LCMS: RtH8=1.75 [M+H]+=354.8, 355.7,
1H NMR (300 MHz, CDCl3) δ 7.86 (s, 1H), 7.59-7.41 (m, 2H), 7.02 (m, 1H), 4.81 (dt, J=3 Hz, 16 Hz), 4.55 (d, 1H), 4.1-3.95 (m, 2H), 1.92 (s, 3H).
k) 5-(5-bromo-2-fluorophenyl)-6,6-difluoro-5-methyl-1,4-oxazepan-3-imine
A mixture of 5-(5-bromo-2-fluorophenyl)-6,6-difluoro-5-methyl-1,4-oxazepane-3-thione (1.0 g, 2.83 mmol) and 10% NH3/MeOH (25 mL) was stirred in a sealed tube at rt for 24 h. Reaction mixture was concentrated and purified by column chromatography on silica gel with 5% MeOH, 2% NH3 in chloroform to furnish the title compound as a pale brown gum. Yield=1.1 g ( ) LCMS: RtH8=0.146 [M+H]+=337.0, 339.0,
1H NMR (300 MHz, DMSO-d6) δ 7.87 (dd, 1H, J=2.5 Hz, 6.4 Hz), 7.53-7.45 (m, 1H), 7.09 (dd, 1H, J=5.1 Hz, 9.2 Hz), 6.08 (s, 2H), 4.32-4.11 (m, 3H), 3.97-3.83 (m, 1H), 1.88 (d, 3H).
l) tert-butyl 5-(5-bromo-2-fluorophenyl)-6,6-difluoro-5-methyl-1,4-oxazepan-3-ylidenecarbamate
To a solution of 5-(5-bromo-2-fluorophenyl)-6,6-difluoro-5-methyl-1,4-oxazepan-3-imine (1.1 g, 3.2 mmol) in dry THF (15 mL) was added diisopropyl ethyl amine (0.84 mL, 4.8 eq) at 0° C. and stirred for 15 min. di-tertiarybutyl pyrocarbonate (0.98 mL, 4.2 eq) was added to the reaction mixture and stirred 2 h. Reaction mixture was concentrated and the crude product was purified by column chromatography on silica gel with 8% ethyl acetate in Hexane. Yield=950 mg (67%). TLC (20% ethyl acetate in Hexane): Rf=0.75),
LCMS: RtH8=1.781 [M+H-Boc]+=337.0, 339.0,
1H NMR (300 MHz, CDCl3) δ 10.9 (s, 1H), 7.61-7.39 (m, 2H), 7.03-6.95 (m, 1H), 4.42-4.21 (m, 2H), 4.03-3.81 (m, 2H), 1.93 (s, 3H), 1.51 (s, 9H).
m) tert-butyl 5-(5-azido-2-fluorophenyl)-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-1,4-oxazepin-3-ylcarbamate
To a solution of tert-butyl 5-(5-bromo-2-fluorophenyl)-6,6-difluoro-5-methyl-1,4-oxazepan-3-ylidenecarbamate (1.72 g, 3.94 mmol) and trans-N,N′-dimethylcyclohexane1,2-diamine (0.62 mL, 3.94 mmol), in ethanol (60 mL) was added a solution of NaN3 (2.05 g, 31.5 mmol), (+)-sodium-L-ascorbate (0.312 g, 1.57 mmol) in water (16 mL). The reaction mixture was degassed with argon for 15 min. Cu(I) (0.3 g, 1.57 mmol) was added to the reaction mixture and heated to 70° C. for 5 min.
The reaction mixture was concentrated under reduced pressure, diluted with ethyl acetate, washed with brine and organic layer was dried over anhydrous sodium sulphate and concentrated under reduced pressure. The crude reaction mass was purified by column chromatography on silica gel with 8%-40% ethyl acetate in hexane to furnish title compound along with the corresponding amine. Yield=Amine (0.62 g, 36%); Azide (0.32 g, 22%). TLC (10% ethyl acetate in Hexane for azide): Rf=0.5; (50% ethyl acetate in Hexane for amine; Rf=0.4). The azide (620 mg, 1.5 mmol) was hydrogenated with H2 gas under balloon pressure in the presence of 10% Pd/C (50 mg) in ethyl acetate (10 mL) for 1 h at rt. Catalyst was filtered using a short bed of celite and the filtrate was concentrated under reduced pressure to furnish amine product as color less gum. Yield=575 mg, (99%).
Azide: LCMS: RtH8=1.683 [M+H]+=399.9,
1H NMR (400 MHz, CDCl3) δ 10.89 (s, 1H), 7.21-6.95 (m, 3H), 4.41-4.22 (m, 2H), 4.05-3.80 (m, 2H), 1.98 (s, 3H), 1.25 (s, 9H);
Amine: LCMS: RtH8=0.38 [M+H-Boc]+=374.2, 274.2,
1H NMR (400 MHz, CDCl3) δ 10.62 (s, 1H), 6.91-6.83 (m, 1H), 6.72-6.6.67 (m, 1H), 6.64-6.59 (m, 1H), 4.41-4.4.15 (m, 2H), 4.03-3.85 (m, 4H), 1.90 (s, 3H), 1.49 (s, 9H).
n) tert-butyl 5-(5-(5-chloropicolinamido)-2-fluorophenyl)-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-1,4-oxazepin-3-ylcarbamate
To a solution of 5-Chloro-pyridine-2-carboxylic acid (0.085 g, 0.54 mmol) in dry DMF (3.0 mL), Et3N (0.22 mL, 1.6 mmol) and EDCl (0.128 mg, 0.81 mmol) and HOAt (0.11 g, 0.81 mmol) and tert-butyl 5-(5-amino-2-fluorophenyl)-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-1,4-oxazepin-3-ylcarbamate (0.201 g, 0.54 mmol) were added and stirred at rt for 24 h. upon completion of the reaction, reaction mixture was poured into a rapidly stirred ice cold water to obtain precipitate. Yield=220 mg, (80%). TLC (30% ethyl acetate in Hexane): Rf=0.4, LCMS: RtH8=1.78 [M+H-Boc]+=413.0, 414.8,
1H NMR (400 MHz, CDCl3) δ 10.89 (s, 1H), 9.91 (s, 1H), 8.6 (s, 1H), 8.22 (d, 1H, J=9.3 Hz), 7.90 (dd, 2H, J=10.2 Hz, 3.1 Hz), 7.69 (d, 1H), 7.11 (t, 1H), 4.44-4.21 (m, 2H), 3.93-4.18 (m, 2H), 1.98 (s, 3H), 1.49 (s, 9H).
o) N-(3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-1,4-oxazepin-5-yl)-4-fluorophenyl)-5-chloropicolinamide
A solution of tert-butyl 5-(5-(5-chloropicolinamido)-2-fluorophenyl)-6,6-difluoro-5-methyl-2,5,6,7-tetrahydro-1,4-oxazepin-3-ylcarbamate (0.210 g, 0.41 mmol) in 10% dioxane in HCl was heated in a sealed tube at 55° C. for 5 h. Reaction mixture was concentrated under reduced pressure, basified with 2% methanolic ammonia and purified by column chromatography on silica gel with MeOH/DCM (3:97) to obtain the title compound as an off white solid. Yield=0.08 g (50%). TLC (20% methanol in chloroform): Rf=0.35, m.p.=190-193° C.,
LCMS: RtH8=0.39 [M+H]+=412.8, 415.0,
1H NMR (400 MHz, DMSO-d6) δ 8.79 (d, 1H), 8.23-8.12 (m, 2H), 8.07-8.02 (dd, 1H, J=9.6 Hz, 3.4 Hz), 7.85 (dt, 1H, J=8.5 Hz, 2.6 Hz), 7.10 (dd, 1H, J=12.2 Hz, 7.6 Hz), 5.98 (s, 2H), 4.29-4.08 (m, 3H), 3.98-3.85 (m, 1H), 1.76 (s, 3H).
Example 101
The compound listed in Table 15 can be prepared by a procedure analogous to that used in example 100.










TABLE 15







1H-NMR
MS [m/z;


Example
Compound
(δ)
(M + 1)+]







101




1H NMR (400 MHz, DMSO- d6) δ 10.57 (s, 1H), 8.85 (d, 1H), 8.32 (d, 1H), 8.12-8.01 (m, 2H), 7.90-7.81 (m, 1H), 7.16-7.05 (m, 1H), 6.17 (s, 1H), 4.32-4.05 (m, 3H), 4.01-3.85 (m 1H),  1.76 (s, 3H)
456, 458



5-Bromo-pyridine-2-carboxylic acid





[3-(3-amino-6,6-difluoro-5-methyl-2,5,6,7-





tetrahydro-[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-amide









Examples 102 to 110
The compounds listed in Table 16 were prepared by a procedure analogous to that used in example 34.










TABLE 16








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







102




11.09-10.96 (m, 1H), 10.50 (s, 1H), 9.65 (d, 1H), 8.67 (d, 1H), 8.25 (s, 1H), 7.91 (s, 1H), 7.77 (d, 1H), 7.57 (s, 1H), 7.52-7.43 (m, 1H), 7.30 (d, 1H), 6.71 (t, 1H, CHF2), 4.73-4.57 (m, 2H), 4.37 (d, 1H), 4.04 (d, 1H)
414, 416



4-Bromo-furan-2-carboxylic acid [3-(5-amino-3-difluoromethyl-





3,6-dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




 


103




10.15 (s, 1H), 7.90 (s, 1H), 7.83 (s, 1H), 7.49 (d, 1H), 7.31-7.16 (m, 2H), 6.06-5.76 (m, 5H), 4.08 (d, 1H), 4.04-3.96 (m, 1H), 3.95-3.87 (m, 1H), 3.71 (d, 1H)
364



6-Hydroxy-pyridazine-3-carboxylic acid [3-(5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




 


104




11.09 (s, 1H), 10.24 (s, 1H), 9.71 (s, 1H), 8.83 (s, 1H), 8.67 (s, 1H), 7.96 (s, 1H), 7.90 (d, 1H), 7.46 (t, 1H), 7.30 (d, 1H), 6.69 (t, 1H, CHF2), 4.72-4.55 (m, 2H), 4.38 (d, 1H), 4.03 (d, 1H), 2.52 (s, 3H)
351



2-Methyl-oxazole-4-carboxylic acid [3-(5-





amino-3-difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




 


105




11.06 (s, 1H), 10.18 (s, 1H), 9.68 (s, 1H), 8.77 (s, 1H), 8.69 (s, 1H), 8.00-7.83 (m, 2H), 7.46 (t, 1H), 7.30 (d, 1H), 6.70 (t, 1H, CHF2), 4.73-4.56 (m, 2H), 4.38 (d, 1H), 4.03 (d, 1H), 2.86 (q, 2H), 1.30 (t, 3H)
365



2-Ethyl-oxazole-4-carboxylic acid [3-(5-





amino-3-difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




 


106




11.05 (s, 1H), 10.04 (s, 1H), 9.69 (s, 1H), 8.79 (s, 1H), 7.95 (s, 1H), 7.90 (d, 1H), 7.44 (t, 1H), 7.28 (d, 1H), 6.69 (t, 1H, CHF2), 4.72-4.57 (m, 2H), 4.38 (d, 1H), 4.02 (d, 1H), 2.59 (s, 3H), 2.46 (s, 3H)
365



2,5-Dimethyl-oxazole-4-carboxylic acid [3-





(5-amino-3-difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




 


107




11.11 (s, 1H), 10.61 (s, 1H), 9.72 (s, 1H), 8.84 (s, 1H), 8.39-8.27 (m, 1H), 7.98 (s, 1H), 7.90 (s, 1H), 7.77 (d, 1H), 7.47 (t, 1H), 7.31 (d, 1H), 6.71 (t, 1H, CHF2), 4.72-4.55 (m, 2H), 4.28 (d, 1H), 4.04 (d, 1H), 3.89 (s, 3H)
455, 457



5-Bromo-3-methoxy-pyridine-2-carboxylic





acid [3-(5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




 


108




12.20 (br. s., 1H), 11.13 (s, 1H), 11.02 (s, 1H), 9.72 (s, 1H), 8.85 (s, 1H), 8.37 (s, 1H), 8.00-7.84 (m, 3H), 7.53 (t, 1H), 7.39 (d, 1H), 6.71 (t, 1H, CHF2), 4.74-4.54 (m, 2H), 4.40 (d, 1H), 4.06 (d, 1H)
441, 443



5-Bromo-3-hydroxy-pyridine-2-carboxylic





acid [3-(5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




 


109




10.40 (s, 1H), 8.87 (s, 1H), 8.44 (s, 1H), 8.00 (br. s., 1H), 7.81 (br. s., 1H), 7.32 (d, 2H), 6.06-5.88 (m, 3H), 4.53 (dd, 2H), 4.08-3.97 (m, 2H),  3.97-3.84 (m, 1H), 3.65-3.80 (m, 3H), 3.31 (s, 3H)
422



5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic





acid [3-(5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride




 


110




11.07 (s, 1H), 11.01 (s, 1H), 9.68 (s, 1H), 9.41 (s, 1H), 9.11 (s, 1H), 8.74 (br. s., 1H), 8.08 (br. s., 1H), 7.99 (d, 1H), 7.53 (t, 1H), 7.36 (s, 1H), 7.27 (t, 1H, CHF2), 6.72 (t, 1H, CHF2), 4.73-4.55 (m, 2H), 4.39 (d, 1H), 4.06 (d, 1H)
398



5-Difluoromethyl-pyrazine-2-carboxylic acid





[3-(5-amino-3-difluoromethyl-3,6-dihydro-





2H-[1,4]oxazin-3-yl)-phenyl]-amide hydrochloride









Examples 111 to 151
The compounds listed in Table 17 were prepared by procedures analogous to those used in examples 42 or 112.
For enantiomerically pure compounds the racemic precursor [5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (example 42j)) was separated via prep-HPLC on Chiralpak AD-H 250×4.6 mm column using supercritical CO2/EtOH 9:1 as an eluent. The desired compound was the slower eluting (R)-enantiomer. Enantiomeric excess=99.7%; [α]D=−109.7° (c=1, CHCl3).










TABLE 17








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







111




11.06 (s, 1H), 10.99 (s, 1H), 9.76 (s, 1H), 8.75 (s, 1H), 8.73 (s, 1H), 8.48 (d, 1H), 7.93-7.86 (m, 2H), 7.41 (t, 1H), 6.79 (t, J = 54 Hz, 1H), 4.71 (d, 1H), 4.65 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H)
433



3,5-Dichloro-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


112




11.09 (s, 1H), 11.01 (s, 1H) 9.76 (s, 1H), 9.22 (s, 1H), 8.75 (s, 1H), 8.61 (d, 1H), 8.30 (d, 1H), 8.12-8.06 (m, 2H), 7.41 (dd, 1H), 6.79 (t, J = 54 Hz, 1H), 4.71 (d, 1H), 4.65 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H) 
390



5-Cyano-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


113




11.00 (s, 1H), 10.85 (s, 1H) 9.74 (s, 1H), 8.72-8.67 (m, 2H), 8.23-8.18 (m, 1H), 8.04-8.00 (m, 1H), 7.96-7.92 (m, 1H), 7.40 (dd, 1H), 6.79 (t, J = 54 Hz, 1H), 4.71 (d, 1H), 4.65 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H) 
401



3,5-Difluoro-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


114




11.01 (s, 1H), 10.74 (s, 1H), 9.76 (s, 1H), 8.74 (s, 1H), 8.08 (s, 1H), 8.03-7.99 (m, 1H), 7.98-7.93 (m, 1H), 7.69-7.64 (m, 2H), 7.39 (dd, 1H), 6.79 (t, J = 54 Hz, 1H), 4.71 (d, 1H), 4.65 (d, 1H),  4.34 (d, 1H), 4.18 (d, 1H),  2.57 (s, 3H)
496, 498



5-Bromo-3-methyl-benzofuran-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


115




11.02 (s, 1H), 10.79 (s, 1H) 9.77 (s, 1H), 8.76 (s, 1H), 8.01-7.94 (m, 2H), 7.38 (dd, 1H), 6.78 (t, J = 54 Hz, 1H), 4.71 (d, 1H), 4.65 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H) 
418



5-Chloro-4,6-dideutero-3-





trideuteromethyl-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


116




11.00 (s, 1H), 10.79 (s, 1H) 9.76 (s, 1H), 8.73 (s, 1H), 8.01-7.94 (m, 2H), 7.38 (dd, 1H), 6.78 (t, J = 54 Hz, 1H), 4.71 (d, 1H), 4.65 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H)
462, 464



5-Bromo-4,6-dideutero-3-





trideuteromethyl-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


117




11.08 (s, 1H), 10.99 (s, 1H), 9.78 (s, 1H), 8.81 (s, 1H), 8.77 (s, 1H), 8.58 (s, 1H), 7.92-7.85 (m, 2H), 7.40 (dd, 1H), 6.79 (t, J = 54 Hz, 1H), 4.71 (d, 1H), 4.65 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H)
478



5-Bromo-3-chloro-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


118




11.08 (s, 1H), 10.99 (s, 1H), 9.78 (s, 1H), 8.81 (s, 1H), 8.77 (s, 1H), 8.35 (d, 1H), 8.12-8.05 (m, 3H), 7.39 (t, 1H), 6.78 (t, J = 54 Hz, 1H), 4.72 (d, 1H), 4.64 (d, 1H), 4.33 (d, 1H), 4.18 (d, 1H) 
443, 445



5-Bromo-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


119




12.17 (s, 1H), 11.16 (s, 1H), 11.02 (s, 1H), 9.78 (s, 1H), 8.78 (s, 1H), 8.37 (s, 1H), 8.03-7.96 (m, 2H), 7.90 (s, 1H), 7.42 (t, 1H), 6.78 (t, J = 54 Hz, 1H), 4.72 (d, 1H), 4.64 (d, 1H), 4.33 (d, 1H), 4.18 (d, 1H)
459, 461



5-Bromo-3-hydroxy-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


120




10.42 (s, 1H), 8.37 (s, 1H), 8.13-8.08 (m, 2H), 7.86-7.80 (m, 1H), 7.59 (d, 1H), 7.16 (t, 1H), 6.16 (s, 2H), 6.14 (t, J = 54 Hz, 1H), 4.21 (q, 2H), 4.12 (d, 1H), 4.01 (d, 1H), 3.90 (d, 1H), 3.82 (d, 1H), 1.38 (t, 3H)
409



5-Ethoxy-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


121




11.17-11.00 (m, 2H), 9.79 (br. s., 1H), 9.24 (s, 2H), 8.80 (br. s., 1H), 8.15-7.98 (m, 2H), 7.40 (dd, 1H), 6.79 (t, 1H, CHF2), 4.82-4.68 (m, 1H), 4.68-4.55 (m, 1H), 4.33 (d, 1H), 4.18 (d, 1H)
488, 490



5-Bromo-pyrimidine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


122




11.15 (s, 1H), 11.06 (s, 1H), 9.80 (s, 1H), 9.41 (s, 1H), 9.11 (s, 1H), 8.81 (br. s., 1H), 8.19-8.01 (m, 2H), 7.42 (dd, 1H), 7.32-7.21 (m, 1H), 7.21-7.09 (m, 1H), 6.79 (t, 1H, CHF2), 4.78-4.69 (m, 1H), 4.69-4.58 (m, 1H), 4.33 (d, 1H), 4.19 (d, 1H)
416



5-Difluoromethyl-pyrazine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


123




11.05 (s, 1H), 10.82 (s, 1H), 9.82 (br. s., 1H), 8.92 (s, 1H), 8.85 (br. s., 1H), 8.56 (s, 1H), 8.14-7.99 (m, 2H), 7.39 (dd, 1H), 7.24 (t, 1H), 7.19-7.10 (m, 1H), 6.78 (t, 1H, CHF2), 6.57-6.38 (m, 1H), 4.81-4.68 (m, 3H), 4.68-4.58 (m, 1H), 4.33 (d, 1H), 4.18 (d, 1H)
446



5-(2,2-Difluoro-ethoxy)-pyrazine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


124




10.97 (s, 1H), 10.86 (s, 1H), 9.72 (br. s., 1H), 8.94 (s, 1H), 8.68 (br. s., 1H), 8.64 (s, 1H), 8.15-8.07 (m, 1H), 8.04 (d, 1H), 7.39 (dd, 1H), 6.79  (t, 1H, CHF2), 5.17 (q, 2H), 4.76-4.68 (m, 1H), 4.68-4.59 (m, 1H), 4.33 (d, 1H), 4.18 (d, 1H)
464



5-(2,2,2-Trifluoro-ethoxy)-pyrazine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


125




11.04 (s, 1H), 10.64 (s, 1H), 9.78 (s, 1H), 8.79 (s, 1H), 8.25 (s, 1H), 7.95 (dd, 1H), 7.86 (dd, 1H), 7.60 (s, 1H), 7.37 (dd, 1H), 6.77 (t, 1H, CHF2), 4.76-4.68 (m, 1H), 4.68-4.59 (m, 1H), 4.32 (d, 1H), 4.17 (d, 1H)
432, 434



4-Bromo-furan-2-carboxylic acid [3-((R)-





5-amino-3-difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


126




11.00 (s, 1H), 10.65 (s, 1H), 9.77 (s, 1H), 8.78 (s, 1H), 8.73 (d, 1H), 8.07 (d, 1H),  7.99 (d, 1H), 7.82 (d, 1H),  7.33 (m, 2H), 7.13 (s, 1H), 7.08 (t, 1H), 6.77 (t, 1H, CHF2), 4.71 (d, 1H), 4.64 (d, 1H), 4.32 (d, 1H), 4.17 (d, 1H)
404



Pyrazolo[1,5-a]pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H [1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


127




11.01 (s, 1H), 10.41 (s, 1H), 9.77 (s, 1H), 8.77 (s, 1H), 8.68 (s, 1H), 8.08-7.99 (m, 1H), 7.99-7.89 (m, 1H), 7.35 (dd, 1H), 6.77 (t, 1H, CHF2), 4.76-4.67 (m, 1H), 4.67-4.57 (m, 1H), 4.31 (d, 1H), 4.16 (d, 1H), 2.52 (s, 3H) 
369



2-Methyl-oxazole-4-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


128




10.97 (s, 1H), 10.22 (s, 1H), 9.76 (s, 1H), 8.75 (br. s., 1H), 8.05-7.90 (m, 2H), 7.33 (dd, 1H), 6.76 (t, 1H, CHF2), 4.77-4.67 (m, 1H), 4.67-4.58 (m, 1H), 4.32 (d, 1H), 4.15 (d, 1H), 2.58 (s, 3H), 2.46 (s, 3H) 
383



2.5-Dimethyl-oxazole-4-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


129




11.07 (s, 1H), 10.80 (s, 1H), 9.85 (s, 1H), 8.90 (s, 1H), 8.49 (d, 1H), 8.39 (d, 1H), 7.87 (m, 2H), 7.63 (d, 1H), 7.41 (m, 1H), 7.14 (dd, 1H),  6.99 (t, 1H), 6.25 (t, 1H, CHF2), 4.14 (m, 3H), 3.96 (d, 1H)
404



Imidazo[1,2-a]pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


130




11.04 (s, 1H), 10.71 (s, 1H), 9.76 (s, 1H), 8.75 (s, 1H), 8.36 (s, 1H), 7.99 (s, 1H), 7.94 (d, 1H), 7.86-7.84 (m, 1H), 7.37 (dd, 1H), 6.78 (t, 1H, CHF2), 4.68 (q, 2H), 4.33 (d, 1H), 4.17 (d, 1H), 3.89 (s, 3H)
473, 475



5-Bromo-3-methoxy-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


131




11.01 (s, 1H), 10.35 (s, 1H), 9.77 (s, 1H), 8.83-8.73 (m, 1H), 8.70 (s, 1H), 8.06-7.90 (m, 2H), 7.35 (dd, 1H), 6.77 (t, 1H, CHF2), 4.76-4.67 (m, 1H), 4.67-4.57 (m, 1H), 4.32 (d, 1H), 4.17 (d, 1H), 2.86 (q, 2H), 1.30 (t, 3H)
383



2-Ethyl-oxazole-4-carboxylic acid [3-





((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


132




11.03 (s, 1H), 10.97 (s, 1H), 9.71 (s, 1H), 8.95 (s, 1H), 8.66 (br. s., 1H), 8.31-8.27 (m, 2H), 8.14-8.07 (m, 2H), 7.45-7.38 (m, 1H), 7.28 (t, 1H), 6.79 (t, 1H), 4.71 (d, 1H), 4.63 (d, 1H), 4.33 (d, 1H), 4.18 (d, 1H)
415



5-Difluoromethyl-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-





3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide hydrochloride




 


133




11.04 (s, 1H), 10.77 (s, 1H), 9.82 (s, 1H), 8.88 (s, 1H), 7.97 (d, 1H), 7.54 (d, 1H), 7.35 (t, 1H), 7.23 (s, 1H), 6.75 (t, 1H, CHF2), 4.70 (d, 1H), 4.62 (d, 1H), 4.31 (d, 1H), 4.16 (d, 1H)
368



1-Methyl-1H-imidazole-2 carboxylic acid





[3-((R)-5-amino-3 difluoromethyl-3,6-





dihydro-2H [1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


134




13.61 (s, 1H), 11.04 (s, 1H), 10.57 (s, 1H), 9.80 (s, 1H), 8.88-8.74 (m, 1H), 8.01-7.83 (m, 3H), 7.37 (dd, 1H), 7.03 (dd, 1H), 6.77 (t, 1H, CHF2), 4.79-4.67 (m, 1H), 4.67-4.58 (m, 1H), 4.32 (d, 1H),  4.17 (d, 1H)
382



6-Hydroxy-pyridazine-3-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


135




11.01 (s, 1H), 10.77 (s, 1H), 9.77 (br. s., 1H), 8.92 (d, 1H), 8.77 (br. s., 1H), 8.48 (d, 1H), 8.17-7.98 (m, 2H), 7.40 (dd, 1H), 6.80 (t, 1H, CHF2), 4.83-4.60 (m, 2H), 4.60-4.51 (m, 2H), 4.36 (d, 1H), 4.20 (d, 1H), 3.75 (dd, 2H), 3.34 (s, 3H) 
440



5-(2-Methoxy-ethoxy)-pyrazine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


136




10.52 (br. s., 1H), 8.87 (s, 1H), 8.48 (s, 1H), 8.13 (d, 1H), 7.80 (br. s., 1H), 7.17 (br. s., 1H), 6.23-6.05 (m, 2H), 4.92-4.82 (m, 1H), 4.82-4.73 (m, 1H),  4.73-4.67 (m, 1H), 4.67-4.57 (m, 1H), 4.11 (d, 1H), 4.06-3.96 (m, 1H), 3.91 (d, 1H), 3.84 (d, 1H)
428



5-(2-Fluoro-ethoxy)-pyrazine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


137




11.01 (s, 1H), 10.93 (s, 1H), 9.77 (s, 1H), 8.80 (s, 1H), 8.75 (s, 1H), 8.22 (d, 1H), 8.16 (d, 1H), 8.11-8.04 (m, 2H), 7.38 (t, 1H), 6.78 (t, J = 54 Hz, 1H), 4.72 (d, 1H), 4.64 (d, 1H), 4.33 (d, 1H), 4.18 (d, 1H)
399



5-Chloro-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


138




11.02 (br. s., 1H), 10.89 (s, 1H), 9.78 (br. s., 1H), 8.77 (br. s., 1H), 8.63 (d, 1H), 8.24 (d, 1H), 8.05-8.12 (m, 2H), 7.93 (dd, 1H), 7.52 (t, 1H), 7.39 (dd, 1H), 6.79 (t, 1H), 4.72 (d, 1H), 4.64 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H)
431



5-Difluoromethoxy-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-





3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide hydrochloride




 


139




11.02 (s, 1H), 10.82 (s, 1H), 9.78 (br. s., 1H), 8.78 (br. s., 1H), 8.55 (d, 1H), 8.20 (d, 1H),  8.12-8.05 (m, 2H), 7.83 (dd, 1H), 7.38 (dd, 1H), 6.79 (t, 1H), 6.06 (d, 2H), 4.72 (d, 1H), 4.64 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H) 
413



5-Fluoromethoxy-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-





3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide




 


140




10.96 (br. s., 1H), 10.91 (s, 1H), 9.67 (br. s., 1H), 8.68 (s, 1H), 8.59 (br. s., 1H), 8.37 (dd, 1H), 8.02 (dd, 1H), 7.97-7.90 (m, 1H), 7.40 (dd, 1H), 6.79 (t, 1H), 4.71 (d, 1H), 4.64 (d, 1H), 4.33 (d, 1H), 4.18 (d, 1H) 
417



5-Chloro-3-fluoro-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-





3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide




 


141




11.03 (s, 1H), 10.99 (s, 1H), 9.65 (br. s., 1H), 9.13 (s, 1H), 8.95 (s, 1H), 8.71 (br. s., 1H), 8.09 (dd, 1H), 8.06-7.96 (m, 1H), 7.40 (dd, 1H), 6.78 (t, 1H), 4.70 (d, 1H), 4.63 (d, 1H), 4.32 (d, 1H), 4.18 (d, 1H) 
400



5-Chloro-pyrazine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


142




11.02 (br. s., 1H), 10.25 (s, 1H), 9.81 (br. s., 1H), 8.83 (br. s., 1H), 8.04 (d, 1H), 7.95 (d, 1H), 7.33 (dd, 1H), 6.76 (t, 1H, CHF2), 6.54 (s, 1H), 4.76-4.67 (m, 1H), 4.67-4.58 (m, 1H), 4.33 (d, 1H), 4.15 (d, 1H), 2.29 (s, 3H)
368



5-Methyl-1H-pyrazole-3-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


143




11.07 (s, 1H), 10.84 (s, 1H), 9.86 (s, 1H), 8.91 (br. s., 1H), 8.59 (s, 1H), 8.16-8.02 (m, 3H), 7.89 (d, 1H), 7.37 (dd, 1H), 6.78 (t, 1H, CHF2), 4.78-4.68 (m, 1H), 4.68-4.57 (m, 1H), 4.34 (d, 1H), 4.17 (d, 1H), 2.43 (s, 3H) 
379



5-Methyl-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


144




10.72 (s, 1H), 8.97 (s, 1H), 8.39 (s, 1H), 8.20-7.97 (m, 1H), 7.83-7.78 (m, 1H), 7.18 (dd, 1H), 6.14 (s, 2H), 6.14 (t, J = 54 Hz, 1H), 4.10 (d, 1H), 4.01 (d, 1H), 3.91 (d, 1H), 3.84 (d, 1H), 2.54 (s, 3H)
404



5-Cyano-3-methyl-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


145




11.01 (s, 1H), 10.42 (s, 1H), 9.31 (s, 1H) 8.82 (s, 1H), 9.2-7.9 (m, 4H), 7.36 (dd, 1H), 6.29 (t, J = 54 Hz, 1H), 4.68 (m, 2H), 4.36 (d, 1H), 4.18 (d, 1H)
382



5-Hydroxy-pyrazine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


146




10.77 (s, 1H), 9.65 (s, 1H), 8.85 (s, 1H), 8.78 (s, 1H), 8.40 (s, 1H), 8.11 (d, 1H), 8.03 (m, 1H), 7.37 (dd, 1H), 6.77 (t, 1H), 4.71 (m, 2H), 4.32 (d, 1H), 4.22 (d, 1H)
396



5-Methoxy-pyrazine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


147




10.72 (s, 1H), 8.02-7.97 (m, 1H), 7.83-778 (m, 1H), 7.18 (t, 1H),  6.14 (t, J = 54 Hz, 1H), 6.14 (s, 2H), 4.10 (d, 1H), 4.01 (d, 1H), 3.91 (d, 1H), 3.83 (d, 1H)
409



5-Cyano-4,6-dideutero-3-





trideuteromethyl-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-





3,6-diydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


148




11.1 (s, 1H), 10.45 (s, 1H), 9.91 (s, 1H), 9.02 (s, 1H), 8.32 (s, 1H), 8.04-8.0 (m, 2H), 7.35 (t, 1H), 6.77 (t, 1H, CHF2), 4.72 (d, 1H, AB-system), 4.65 (d, 1H, AB-system), 4.32 (d, 1H, AB-system), 4.18 (d, 1H, AB-system), 2.77 (s, 3H)  
385



5-Methyl-thiazole-4-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


149




11.1 (s, 1H), 10.92 (s, 1H), 9.88 (s, 1H), 8.95 (s, 1H), 8.08-8.04 (m, 1H), 8.0-7.98 (m, 1H), 7.82 (s, 1H), 7.40-7.36 (m, 1H), 6.77 (t, 1H, CHF2), 4.72 (d, 1H, AB-system), 4.65 (d, 1H, AB-system), 4.32 (d, 1H, AB-system), 4.18 (d, 1H, AB-system), 2.58 (s, 3H) 
385



5-Methyl-thiazole-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


150




11.04 (s, 1H), 10.32 (s, 1H), 9.84 (s, 1H), 8.87 (br. s., 1H), 8.02 (d, 1H), 7.96 (dd, 1H), 7.87 (d, 1H), 7.33 (dd, 1H), 6.77 (t, 1H, CHF2), 4.78-4.68 (m, 1H), 4.68-4.58 (m, 1H), 4.32 (d, 1H), 4.16 (d, 1H), 3.97 (s, 3H)
368



1-Methyl-1H-pyrazole-3-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


151




11.08 (s, 1H), 10.98 (s, 1H), 9.77 (s, 1H), 8.97 (s, 1H), 8.76 (s, 1H), 7.91-7.76 (m, 2H), 7.40 (dd, 1H), 6.79 (t, 1H, CHF2), 4.78-4.59 (m, 2H), 4.33 (d, 1H), 4.18 (d, 1H), 3.96 (s, 3H)
413



1-Methyl-4-nitro-1H-pyrazole-3-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride









More Detailed Description of Preparation of Example 112
5-Cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




a) 5-Difluoromethyl-5-(2-fluoro-phenyl)-morpholin-3-one
5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-morpholin-3-one (190 g, 586 mmol) [example 42 step e)] and sodium acetate (57.7 g, 703 mmol) were suspended in 1850 mL methanol. 10% Pd on charcoal (18.7 g) was then added and the reaction mixture was shaken in a Parr apparatus in an atmosphere of hydrogen at rt. After 60 minutes the reaction mixture was filtered over celite and evaporated. The residue was dissolved in 2 L TBME and washed with aqueous NaHCO3 and brine. The organic layer was dried over MgSO4.H2O and evaporated to give 143.2 g of the title compound as a white solid.
HPLC: RtH1=0.792 min; ESIMS [M+H]+=246;
1H-NMR (CDCl3, 360 MHz): 7.50-7.43 (m, 2H), 7.32-7.27 (m, 1H), 7.19 (dd, 1H), 6.62 (br, 1H), 6.37 (t, J=54 Hz, 1H), 4.34 (d, 1H), 4.31 (d, 1H), 4.22 (d, 1H), 4.20 (d, 1H).
b) 5-Difluoromethyl-5-(2-fluoro-phenyl)-morpholine-3-thione
A mixture of 5-difluoromethyl-5-(2-fluoro-phenyl)-morpholin-3-one (141 g, 575 mmol) and Lawesson's reagent (132 g, 316 mmol) in 1400 ml of THF was heated at 68° C. for 1 h, cooled down and then evaporated. The residue was dissolved in 1 L DCM and filtered over 2 Kg silica gel with 10 L DCM to give 161 g of the title compound in the form of a greenish resin that slowly crystallized. The compound was used without further purification.
HPLC: RtH1=1.799 min; ESIMS [M+H]+=262; 1H-NMR (360 MHz, CDCl3): 7.42-7.35 (m, 1H), 7.28 (t, 1H), 7.19 (t, 1H), 7.11 (dd, 1H), 6.29 (t, J=54 Hz, 1H), 4.57 (d, 1H), 4.47 (d, 1H), 4.21 (d, 1H), 4.18 (d, 1H).
c) 5-Difluoromethyl-5-(2-fluoro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
5-Difluoromethyl-5-(2-fluoro-phenyl)-morpholine-3-thione (160 g, 570 mmol) was dissolved in 2.4 L of a NH3 solution 7 mol/L in methanol for 6.5 h and afterwards left standing overnight. The reaction mixture was evaporated and taken up in 2 L 1N aqueous HCl and 2 L TBME. The aqueous phase was washed with TBME and made basic by the addition of 300 ml 30% aqueous NaOH and some ice. The mixture was extracted with DCM three times and the combined organic layers were dried with Na2SO4 and concentrated in vacuo. The title compound was obtained by crystallization from DCM/heptanes (128.45 g).
HPLC: RtH3=2.059 min; ESIMS [M+H]+=245;
1H-NMR (CDCl3, 360 MHz): 7.77 (t, 1H), 7.38-7.30 (m, 1H), 7.21 (t, 1H), 7.09 (dd, 1H), 6.19 (t, J=54 Hz, 1H), 4.51 (br, 2H), 4.32, (d, 1H), 4.18 (d, 1H), 4.05 (d, 1H), 3.96 (d, 1H), 1.39 (s, 3H), 1.24 (s, 3H).
d) 5-Difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
Potassium nitrate (60.3 g, 596 mmol) was added portionwise to 600 ml sulfuric acid (Temperature <20° C.). This solution was added dropwise to a solution of 5-difluoromethyl-5-(2-fluoro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (112 g, 459 mmol) in 600 ml sulfuric acid, while keeping the reaction temperature <22° C. with an ice bath. After stirring for 1 h, the mixture was poured onto 10 Kg ice. TBME (6 L) was added and the pH was adjusted to 12-14 by the addition of about 5 L 30% aqueous NaOH. The phases were separated and the aqueous phase was extracted twice with TBME. The compined organic layers were dried with sodium sulfate and evaporated to give 130 g of a yellow solid that was used further without purification.
HPLC: RtH3=2.063 min; ESIMS [M+H]+=290;
1H-NMR (CDCl3, 360 MHz): 8.71 (dd, 1H), 8.13 (dt, 1H), 7.13 (dd, 1H), 5.99 (t, J=54 Hz, 1H), 4.55 (br, 2H), 4.33 (dd, 1H), 4.10 (d, 1H), 3.97 (d, 1H), 3.82 (dt, 1H).
e) [5-Difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
A solution of 5-Difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (144.5 g, 500 mmol), Boc anhydride (142 g, 650 mmol) and DIPEA (131 ml, 749 mmol) in 2500 ml THF was stirred for 3 days at rt, after which there was still starting material remaining. Boc anhydride (56 g, 325 mmol) was added, the mixture heated to 60° C. and stirred for 10 h until the reaction was complete. The mixture was evaporated, dissolved in TBME, washed with ice-cold 1N aqueous HCl, water, 10% aqueous NaHCO3 and brine. The organic phase was dried with sodium sulfate, filtered and evaporated. The product was purified by crystallization from DCM/heptanes. Yield 182.8 g white crystal's.
HPLC: RtH1=3.259 min; ESIMS [M+Na]+=412;
1H-NMR (CDCl3, 360 MHz): 8.70 (dd, 1H), 8.27 (dt, 1H), 7.34 (br, 1H), 7.25 (dd, 1H), 6.09 (t, J=54 Hz, 1H), 4.85 (d, 1H), 4.58 (d, 1H), 4.49 (dd, 1H), 3.94 (dt, 1H).
f) [5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
[5-Difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (180 g, 462 mmol) and 17.61 g Pd—C 10% were suspended in 1760 mL THF. The mixture was shaken in a Parr apparatus in an atmosphere of hydrogen at rt. After 6 h the reaction mixture was filtered over celite and evaporated. The residue was crystallized from DCM/heptanes to provide 157.6 g of the title compound as beige crystals.
HPLC: RtH3=2.748 min; ESIMS [M+H]+=360;
1H-NMR (CDCl3, 360 MHz): Spectrum uninterpretable due to the presence of a complex mixture of rotamers.
g) [(R)-5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
The racemic product ((rac)[5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester) was separated via prep-HPLC on Chiralpak AD-H 20 um (8×100×48 mm HPLC columns), on a Bayer SMB CC50 instrument using SMB technology with heptane/EtOH/MeOH 70:20:10 as eluent. The desired compound was the slower eluting (R)-enantiomer. Yielding 72.29 g of the title compound as a colourless foam.
ee=99.3%; Opt. rotation: [α]D−97.5° (c=1, CHCl3)
HPLC: RtH3=2.748 min; ESIMS [M+H]+=360;
1H-NMR (CDCl3, 360 MHz): Spectrum uninterpretable due to the presence of a complex mixture of rotamers.
h) ((R)-5-{5-[(5-Cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
[(R)-5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (35 g, 97.4 mmol), 5-cyano-pyridine-2-carboxylic acid (15.87 g, 107.14 mmol) and HOBt hydrate (22.35 g, 146.1 mmol) were dissolved in 185 ml DMF and stirred with ice cooling. When the temperature had reached 0-5° C. EDC (22.33 ml, 126.62 mmol) was added dropwise. The mixture was stirred for 2 h. The ice bath was taken away and stirring was continued for 2 h. The mixture was taken up in EtOAc and water. The phases were separated and the organic phase was washed with 5% aqueous NaHCO3 and brine. The organic phase was dried with MgSO4.H2O and evaporated to provide a beige solid. Crystallisation from EtOAc/hexane gave the title compound as colorless crystals. Yield 44.47 g.
HPLC: RtH1=2.888 min; ESIMS [M+Na]+=512;
1H-NMR (CDCl3, 360 MHz, signals broadened due to rotamers): 8.95 (s, 1H), 8.48 (d, 1H), 8.25 (d, 1H), 8.08-8.03 (m, 1H), 7.84-7.80 (m, 1H), 7.37 (s, 1H), 7.17 (t, 1H), 6.18 (t, J=54 Hz, 1H), 4.83 (d, 1H), 4.60 (d, 1H), 4.42 (d, 1H), 4.4-4.3 (br, 1H), 3.97 (d, 1H), 1.53 (s, 9H).
i) 5-Cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
((R)-5-{5-[(5-Cyano-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (44.47 g, 91.0 mmol) was dissolved in 450 ml DCM and mildly chilled with a rt water bath. TFA (150 ml) was added. The reaction was slightly exothermic. The mixture was stirred for 1.5 h at rt. The volatiles were removed with vacuum at rt. The residue was taken up in DCM and the procedure repeated twice. The residue was taken up in 3 L EtOAc and washed with 10% aqueous Na2CO3 and brine. The organic phase was dried with sodium sulfate and partially evaporated. iPrOH was added and the mixture chilled. The title compound was collected as snow-white crystals. Yield 30.56 g.
HPLC: RtH3=2.605 min; ESIMS [M+H]+=390;
1H-NMR (dmso-d6, 600 MHz): 10.85 (s, 1H), 9.22 (s, 1H), 8.58 (d, 1H), 8.27 (d, 1H), 8.18-8.14 (m, 1H), 7.85-7.80 (m, 1H), 7.19 (t, 1H), 6.16 (br s, 2H), 6.14 (t, J=54 Hz, 1H), 4.12 (d, 1H), 4.01 (d, 1H), 3.92 (d, 1H), 3.88 (d, 1H).
j) 5-Cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide, hydrochloride
A solution of 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoro-methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide (277 mg, 0.71 mmol) in 5 ml THF was triturated with 0.9 ml of 1M HCl in Et2O. The mixture was partially evaporated, diluted with TBME and partially evaporated (3×), finally to dryness. The hydrochloride salt contained a significant amount of THF. It was taken up in EtOH and evaporated to dryness twice. The product was finally lyophilized with 15 ml water. Yield 261 mg white lyophilisate.
1H-NMR (dmso-d6, 600 MHz): 11.05 (s, 1H), 11.01 (s, 1H), 9.75 (s, 1H), 9.25 (s, 1H), 8.73 (br s, 1H), 8.61 (d, 1H), 8.10 (d, 1H), 8.12-8.07 (m, 2H), 7.41 (dd, 1H), 6.79 (t, J=54 Hz, 1H), 4.70 (d, 1H), 4.65 (d, 1H), 4.36 (d, 1H), 4.18 (d, 1H).
First Alternative Procedure for the Preparation of Example 144
5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




a) 1-(5-Bromo-2-fluoro-phenyl)-2,2-difluoro-ethanone
To a solution of diisoprpopylamine (343 g, 3.39 mol) in THF (4 L) was added slowly n-BuLi (1.4 L, 3.5 mol, 2.5 M in hexane) at −78° C. while keeping reaction temperature under −55° C. After addition, the mixture was stirred at −78° C. for 15 min. At this point, a solution of 4-bromo-1-fluorobenzene (540 g, 3.08 mol) in THF (1 L) was cooled to −60° C. before adding to the reaction mixture gradually while keeping reaction temperature under −55° C. and the resulting yellow solution was stirred at −78° C. for 150 min. Ethyldifluoroacetate (421 g, 3.39 mol) was added to the reaction mixture over 15 min and then the mixture was stirred at −78° C. for 15 min. 1 M HCl (6.0 L) was added to the reaction mixture with stirring. Aqueous layer was extracted with TBME (3×4 L). The combined organic phases were washed with water, dried (MgSO4) and evaporated in vacuo. The resulting residue was distilled under vacuum (90 ̃95° C./0.19 mbar) and fraction at 54 ̃62° C. was collected to obtain the title compound as a colorless liquid. ESIMS: 253 [(M+H)+]; 1H NMR (400 MHz, CDCl3): δ 8.06 (dd, 1H), 7.75 (ddd, 1H), 7.13 (dd, 1H), 6.41 (dt, 1H).
b) 2-Methyl-propane-2-sulfinic acid [1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-eth-(Z)-ylidene]-amide
To the mixture of 1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-ethanone (6.0 kg, 23.7 mol) and (S)-(−)-tert-butanesulfinamide (3.3 kg, 27.2 mol) were added toluene (73 L) with stirring at ambient temperature. After 5 min, titanium ethoxide (6.5 kg, 28.5 mol) was added and the mixture was heated to 50 ̃55° C. The mixture was stirred at 50 ̃55° C. for 3 h and allowed to cool to ambient temperature before concentration in vacuo. The resulting crude product was used directly in next chemical transformation without further purification. ESIMS: 356 [(M+H)+].
c) (SS)-2-Methyl-propane-2-sulfinic acid [(S)-1-(5-bromo-2-fluoro-phenyl)-1-difluoromethyl-allyl]-amide
To a solution of vinyl magnesium bromide (400 mL, 400 mmol, 1 M in THF) was added toluene (400 mL) and the resulting mixture was cooled to below −65° C. To the mixture was added a solution of crude 2-methyl-propane-2-sulfinic acid [1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-eth-(Z)-ylidene]-amide (40.2 g, 113 mmol) in toluene (200 mL) within 20 min, which was pre-cooled to below −60° C., while keeping the reaction temperature under −65° C. After addition, the resulting mixture was stirred at −65 ̃−72° C. for 40 min before quenching with aqueous H2SO4 solution (270 ml, 8.4 wt %). The resulting mixture was stirred and warmed slowly to −20° C., another portion of aqueous H2SO4 solution (540 ml, 8.4 wt %) was added to the mixture slowly via syringe, the resulting mixture was warmed and stirred at 10 ̃20° C. for 1 hour. The two layers were separated and the organic layer was washed with aqueous sodium bicarbonate solution (540 mL, 4 wt %), followed by brine. The organic layer was filtered through a pad of Celite®, concentrated in vacuo to obtain crude title compound as a 3:1 mixture of diastereoisomers, which was used in the following step without further purification. ESIMS: 384 [(M+H)+].
d) 2-Methylpropane-2-sulfinic acid [(R)-1-(5-bromo-2-fluorophenyl)-2,2-difluoro-1-hydroxymethylethyl]-amide
To the solution of (SS)-2-methyl-propane-2-sulfinic acid [(S)-1-(5-bromo-2-fluoro-phenyl)-1-difluoromethyl-allyl]-amide (20 g, 52 mmol) in CH2Cl2 (640 mL) and MeOH (160 mL) was added potassium acetate (1 g, 10.4 mmol) at ambient temperature. The stirred mixture was then cooled to −70° C. O2 gas was bubbled through the reaction mixture with stirring via the gas dispenser under the surface of reaction mixture for 15 min at 1 L/min flow rate. O2 was then replaced by ozone and bubbled through with stirring at −70° C. till the reaction mixture turned blue. At this point, ozone was stopped and replaced by bubbling O2 through the reaction mixture till the fade of blue color. Then sodium borohydride (3.9 g, 104 mmol) was added in portions while maintaining the reaction mixture at <−60° C. The mixture was allowed to warm to −20° C. over 1 h with stirring. Quantofix® Peroxide 25 test stick (Sigma Aldrich) was used to determine the leftover of peroxide in the reaction mixture. When no peroxide exists in the reaction mixture revealed by peroxide test stick, saturated aqueous NH4Cl solution was added slowly to the reaction mixture with stirring till finish of H2 gas evolving. The mixture was concentrated in vacuo to remove organic volatiles. The aqueous residue was partitioned between ethyl acetate and H2O. The separated organic layer was concentrated in vacuo to give the crude title compound as a 3:1 mixture of diastereoisomers. The oily crude title compound was dissolved in TBME and the solution was heated to 50 ̃55° C. before addition of n-heptane at 50 ̃55° C. The mixture was allowed to cool gradually over 20 min to 40 ̃45° C. At this point, pure title compound seed was added to the flask and the reaction mixture was cooled gradually with gentle stirring over 2 h to 0 ̃5° C. and then stirred at 0 ̃5° C. for another 8 h. The resulting slurry was filtered and the filter cake was washed with cold mixed solvent (TBME:n-heptane=1:2). The filter cake was dried in vacuum oven at 40° C. for 12 h to give pure title compound as a white crystalline solid. ESIMS: 388 [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 7.80 (dd, 1H), 7.62 (m, 1H), 7.21 (dd, 1H), 6.51 (t, 1H), 5.72 (s, 1H), 5.23 (dd, 1H), 3.97 (d, 1H), 1.18 (s, 9H).
e) (R)-2-Amino-2-(5-bromo-2-fluoro-phenyl)-3,3-difluoro-propan-1-ol
To a solution of 2-methyl-propane-2-sulfinic acid [(R)-1-(5-bromo-2-fluoro-phenyl)-2,2-difluoro-1-hydroxymethyl-ethyl]-amide (10 g, 25.76 mmol) in DCM (100 ml) was added under argon a 30% HCl in IPA solution (10 ml, 91.6 mmol) below 25° C. After stirring for 30 min at 25° C., cooled down to −10° C., filtered and dried to provide the title compound HCl salt as white crystals: ESIMS: 284, 286 [(M+H)+], 1H NMR (400 MHz, DMSO-d6): δ 9.42 (b, 3H), 7.84 (m, 1H), 7.74 (m, 1H), 7.35 (dd, 1H), 6.68 (t, 1H), 4.03 (m, 2H).
f) (R)-5-Difluoromethyl-5-(2-fluoro-phenyl)-morpholin-3-one
To a suspension of (R)-2-amino-2-(5-bromo-2-fluoro-phenyl)-3,3-difluoro-propan-1-ol HCl salt (0.5 g, 1.56 mmol) in IPAc (5 ml) was added under argon a solution of K2CO3 (0.862 g, 6.24 mmol) in 5 ml water below 25° C. After stirring for 30 min at 25° C. to provide a diphase clear solution, cooled down to −5° C., a solution of 2-chloroacetyl chloride (0.41 g, 3.59 mmol) in IPAc (2 mL) was added slowly with the temperature below 10° C. After stirring for 30 min at 20° C., the organic phase was collected and used for next step directly. THF (3 ml) was added to the above solution, the mixture was cooled to 0° C. The solution was added under argon KOtBu (0.35 g, 3.12 mmol) below 10° C. After stirring at 20° C. for 3 h, water was added to quench the reaction. The organic phase was washed by 1N HCl water solution (5 ml). The organic phase was collected and used for next step directly. The above solution was added water (5 ml) and Pd/C (10%, 50 mg), the mixture was stirred under H2 (1.5 bar) at 25° C. for 3 h. The catalyst was filtered out. The filtration was washed by 15% NaCl water solution. The solvent was removed under vacuum to provide the title compound as yellowish solid. ESIMS: 246 [(M+H)+]. 1H NMR (400 MHz, DMSO-d6): δ 9.08 (s, 1H), 7.57 (m, 1H), 7.48 (m, 1H), 7.30 (m, 1H), 7.81 (m, 1H), 7.30 (m, 2H), 6.55 (t, 1H), 4.1 (m, 4H).
g) (R)-5-Difluoromethyl-5-(2-fluoro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-ylamine sulphate
To a solution of (R)-5-difluoromethyl-5-(2-fluoro-phenyl)-morpholin-3-one (120 g, 489.4 mmol) in CH2Cl2 (1.2 L) was added P2S5 (108 g, 489.4 mmol) at room temperature. The resulted yellow suspension was heated to reflux for 3.5 h. The reaction mixture was filtered through a pad of silica gel (200 ̃300 mesh), washed with CH2Cl2 for 3 times to get a brown solution. The solvent was removed to provide the crude product as an orange solid, which was dispersed in THF (100 mL), then 25% NH3 water solution (750 mL) was added at room temperature. 27 hours later, the reaction mixture was extracted with IPAC. The combined organic phase was washed with water, concentrated to provide a yellow oil. The crude product was dissolved in IPAC (1.2 L) and MeOH (60 mL) and some solid undissolved was removed through filtration. Then conc. H2SO4 (57.6 g, 587.3 mmol) was added to get a white suspension. The suspension was stirred at room temperature overnight and filtered to provide the title compound as a white solid: ESIMS: 245; [(M−H2SO4+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 9.60 (bs, 1H), 8.82 (br s, 1H), 7.52 (m, 2H), 7.35 (m, 2H), 6.75 (t, 1H), 4.65 (dd, 2H), 4.36 (d, 1H), 4.14 (d, 1H).
h) (R)-5-Difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
To a solution of (R)-5-difluoromethyl-5-(2-fluoro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-ylamine sulphate (127.2 g, 371.6 mmol) in conc. H2SO4 (380 mL) was added at 5-15° C. HNO3 (25.8 g, 408.8 mmol). After addition, the reaction mixture was added slowly to 12% NH3 water solution (2.6 L) at 10-20° C. The resulted suspension (pH ̃8) was filtered to provide the title compound as a yellow solid: ESIMS: 290; [(M+H)+]; 1H NMR (400 MHz, CDCl3): δ 8.89 (m, 1H), 8.14 (m, 1H), 7.18 (dd, 1H), 6.10 (t, 1H), 5.65 (br s, 2H), 4.57 (dd, 1H), 4.13 (dd, 2H), 3.88 (m, 1H).
i) [(R)-5-Difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To a suspension of (R)-5-difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-ylamine (20 g, 64.659 mmol) in 2-Me-THF (20 mL) was added at room temperature DIPEA (9.831 g, 76.066 mmol) and (Boc)2O (18.111 g, 82.984 mmol). The resulted mixture was heated to 60-65° C. and stirred at this temperature for 17 h. n-Heptane (200 mL) was added to the reaction mixture, then the mixture was cooled to −20° C. The suspension was filtrated to provide the title compound as a yellow solid: ESIMS: 390; [(M+H)+]; 1H NMR (400 MHz, CDCl3): δ 8.67 (m, 1H), 8.23 (m, 1H), 7.23 (t, 1H), 6.06 (t, 1H), 4.83 (d, 1H), 4.55 (d, 1H), 4.46 (dd, 1H), 3.91 (d, 1H), 1.50 (s, 9H).
j) [(R)-5-(5-Amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester
To a suspension of [(R)-5-difluoromethyl-5-(2-fluoro-5-nitro-phenyl)-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (8 g, 19.23 mmol) in MeOH (56 mL) was added Pd(OH)2/C (20%, 50% water, 0.8 g). The atmosphere in the reactor was replaced by hydrogen (1 bar), then the reaction mixture was stirred at 20° C. for 5 h, filtered through Micro-crystals cellulose and concentrated. The crude product was recrystallized from MeOH and water to provide the title compound as a white solid: ESIMS: 360.1521; [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 9.99 (s, 1H), 6.83 (dd, 1H), 6.74 (m, 1H), 6.50 (m, 1H), 6.22 (t, 1H), 4.95 (s, 2H), 4.46 (dd, 2H), 4.03 (m, 1H), 3.84 (m, 1H), 1.42 (s, 9H).
k) ((R)-5-{5-[(5-Cyano-3-methyl-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester
To a mixture of [(R)-5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (636 g, 1.77 mol) and 5-cyano-3-methylpyridine-2-carboxylic acid (301 g, 1.86 mol) was added THF (4.2 L) under N2 atmosphere at ambient temperature. To the stirring mixture was added N-methylmorpholine (428 mL, 3.89 mol) and the mixture was stirred to form a homogeneous solution. The reaction solution was cooled to 0-5° C. before addition of isobutyl chloroformate (256 mL, 1.95 mol) via an addition funnel while keeping the reaction temperature under 10° C. After the addition, the mixture was stirred at 0-10° C. for 1 h before filtration. The filtrate was evaporated in vacuo and the resulting residue was dissolved in the mixture of CH2Cl2 (3 L) and methanol (1 L). The mixture was concentrated in vacuo at 400 mbar/35° C. till no more volatile coming out to give a slurry. The slurry was filtered and the filter cake was washed with methanol till the wash getting colorless. The wet cake was dried in a vacuum oven at 45° C. for 24 h to give title compound as a white solid: ESIMS: 504; [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 10.72 (s, 1H), 10.00 (s, 1H), 8.98 (s, 1H), 8.39 (s, 1H), 7.92 (m, 1H), 7.81 (m, 1H), 7.24 (m, 1H), 6.30 (t, 1H), 4.56 (d, 1H), 4.44 (d, 1H), 4.12 (m, 1H), 3.90 (m, 1H), 2.55 (s, 3H), 1.41 (s, 9H).
l) 5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
To a solution of ((R)-5-{5-[(5-cyano-3-methyl-pyridine-2-carbonyl)-amino]-2-fluoro-phenyl}-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid tert-butyl ester (23 g, 45.77 mmol) in DCM (615 ml) was added under argon TFA (23 ml, 302.27 mmol) below 25° C. After stirring for 18 h at 25° C., another TFA (12 ml, 151.13 mmol) was added. After stirring at 25° C. for another 6 h, cooled down to −5° C., quenched by 12.5% NH3 aqueous solution (110 ml). The DCM phase was collected and water (100 ml) was added. The DCM of the diphase solution was removed to provide a yellowish suspension. Filtered and dried to provide the title compound as yellowish crystals. ESIMS: 404 [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): 10.72 (s, 1H), 8.96 (s, 1H), 8.38 (s, 1H), 7.99 (dd, 1H), 7.81 (m, 1H), 7.18 (d, 1H), 6.17 (br s, 2H), 6.15 (t, 1H), 3.98 (m, 4H), 2.53 (s, 3H).
The 5-cyano-3-methylpyridine-2-carboxylic acid used in step k was prepared as follows:
m) 5-Bromo-3-methyl-pyridine-2-carboxylic acid tert-butyl ester
To the stirred pale yellow solution of 5-bromo-3-methylpyridine-2-carboxylic acid (20 g, 92.6 mmol), DMAP (0.57 g, 4.6 mmol) in DMF (120 mL) was added Boc anhydride (20.2 g, 92.6 mmol) at ambient temperature. The reaction mixture was stirred at 35 ̃40° C. for 2 h before addition of another portion of Boc anhydride (20.2 g, 92.6 mmol). The reaction was stirred at 35 ̃40° C. for another 16 h to achieve full conversion to the title compound, which was used directly in the following step without further purification. ESIMS: 272 [(M+H)+].
n) 5-Cyano-3-methylpyridine-2-carboxylic acid tert-butyl ester
To a solution of 5-bromo-3-methyl-pyridine-2-carboxylic acid tert-butyl ester (48 g, 176 mmol) in DMF (253 mL) under N2 atmosphere was sequentially added Zn powder (1.15 g, 17.6 mmol), Pd2(dba)3 (4.04 g, 4.4 mmol), tri-tert-butylphosphine (214 g, 10.6 mmol, 10 wt % in n-hexane). The mixture was then heated to 50 ̃60° C. with stirring, at this point, Zn(CN)2 (14.5 g, 123.5 mmol) was added to the mixture in one portion. The reaction mixture was then heated at 69° C. with stirring. After 1 h, the reaction mixture was allowed to cool to below 30° C. and filtered. The filter cake was washed with DMF. To the filtrate was added 2-methyltetrahydrofuran with stirring and the mixture was cooled to <20° C., to the mixture was added slowly 3N aqueous ammonia solution with stirring and the mixture was then stirred vigorously for 30 min at 20 ̃30° C. before layer separation. The organic layer was washed with brine and concentrated in vacuo to give the title compound as a yellowish crystalline solid: ESIMS: 219; [(M+H)+]; 1H NMR (400 MHz, acetone-d6): δ 8.79 (d, 1H), 8.20 (d, 1H), 2.49 (s, 3H), 1.60 (s, 9H).
o) 5-Cyano-3-methylpyridine-2-carboxylic acid
To the stirred solution of 5-cyano-3-methylpyridine-2-carboxylic acid tert-butyl ester (20.7 g, 94.9 mmol) in toluene (200 mL) was added H2O (3.4 mL) at ambient temperature. The mixture was then cooled to 0 ̃5° C. with stirring, at this point, TFA (200 mL) was added to the mixture slowly while maintaining the reaction temperature at 25 ̃35° C. The reaction mixture was then heated at 33° C. with stirring. After 60 min, to the reaction mixture was added toluene and the mixture was concentrated in vacuo to  ̃1⁄4 of the original volume to remove TFA by azeotropic distillation with toluene. To the concentrated mixture was added toluene and the mixture was evaporated in vacuo to  ̃1⁄4 of the original volume. The same evaporation manipulation was repeated once and the precipitated product was collected by filtration. The filter cake was washed with toluene and dried in vacuum oven at 50° C. for 8 h to give the title compound as a pale yellow crystalline solid: ESIMS: 163; [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 8.90 (s, 1H), 8.35 (s, 1H), 2.46 (s, 3H).
Second Alternative Procedure for the Preparation of Example 144
5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




a) (R)-5-(5-Bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine
To a solution of (R)-5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-morpholin-3-one (10 g, 30.86 mmol) in CH2Cl2 (100 mL) was added P2S5 (6.86 g, 30.86 mmol) at room temperature. The resulted yellow suspension was heated to reflux for 6.5 h. The reaction mixture was filtered through a pad of silica gel (200 ̃300 mesh), washed with CH2Cl2 for 3 times to get a brown solution. The solvent was removed to provide the crude product as a yellow solid, which was dispersed in THF (10 mL), then 25% NH3 water solution (60 mL) was added at room temperature. 20 hours later, the reaction mixture was extracted with IPAC. The combined organic phase was washed with brine, dried over Na2SO4, filtered and concentrated to provide the title compound as a yellow solid.
ESIMS: [(M+H)+] 323; 1H NMR (400 MHz, d6-DMSO): δ 7.98 (dd, 1H), 7.54 (m, 1H), 7.17 (m, 1H), 6.32 (br s, 2H), 6.10 (t, 1H), 4.24 (dd, 1H), 3.98 (dd, 2H), 3.73 (m, 1H).
b) 5-Bromo-3-methyl-pyridine-2-carboxylic acid tert-butyl ester
To a stirred pale yellow solution of 5-bromo-3-methylpyridine-2-carboxylic acid (20 g, 92.6 mmol), DMAP (0.57 g, 4.6 mmol) in DMF (120 mL) was added Boc anhydride (20.2 g, 92.6 mmol) at ambient temperature. The reaction mixture was stirred at 35 ̃40° C. for 2 h before addition of another portion of Boc anhydride (20.2 g, 92.6 mmol). The reaction was stirred at 35 ̃40° C. for another 16 h to achieve full conversion to the title compound, which was used directly in the following step without further purification.
ESIMS: 272 [(M+H)+].
c) 5-Cyano-3-methylpyridine-2-carboxylic acid tert-butyl ester
To a solution of 5-bromo-3-methyl-pyridine-2-carboxylic acid tert-butyl ester (48 g, 176 mmol) in DMF (253 mL) under N2 atmosphere was sequentially added Zn powder (1.15 g, 17.6 mmol), Pd2(dba)3 (4.04 g, 4.4 mmol), tri-tert-butylphosphine (214 g, 10.6 mmol, 10 wt % in n-hexane). The mixture was then heated to 50 ̃60° C. with stirring, at this point, Zn(CN)2 (14.5 g, 123.5 mmol) was added to the mixture in one portion. The reaction mixture was then heated at 69° C. with stirring. After 1 h, the reaction mixture was allowed to cool to below 30° C. and filtered. The filter cake was washed with DMF. To the filtrate was added 2-methyltetrahydrofuran with stirring and the mixture was cooled to <20° C., to the mixture was added slowly 3N aqueous ammonia solution with stirring and the mixture was then stirred vigorously for 30 min at 20 ̃30° C. before layer separation. The organic layer was washed with brine and concentrated in vacuo to give the title compound as a yellowish crystalline solid: ESIMS: 219; [(M+H)+]; 1H NMR (400 MHz, acetone-d6): δ 8.79 (d, 1H), 8.20 (d, 1H), 2.49 (s, 3H), 1.60 (s, 9H).
d) 5-Cyano-3-methylpyridine-2-carboxylic acid
To the stirred solution of 5-cyano-3-methylpyridine-2-carboxylic acid tert-butyl ester (20.7 g, 94.9 mmol) in toluene (200 mL) was added H2O (3.4 mL) at ambient temperature. The mixture was then cooled to 0 ̃5° C. with stirring, at this point, TFA (200 mL) was added to the mixture slowly while maintaining the reaction temperature at 25 ̃35° C. The reaction mixture was then heated at 33° C. with stirring. After 60 min, to the reaction mixture was added toluene and the mixture was concentrated in vacuo to  ̃1⁄4 of the original volume to remove TFA by azeotropic distillation with toluene. To the concentrated mixture was added toluene and the mixture was evaporated in vacuo to  ̃1⁄4 of the original volume. The same evaporation manipulation was repeated once and the precipitated product was collected by filtration. The filter cake was washed with toluene and dried in vacuum oven at 50° C. for 8 h to give the title compound as a pale yellow crystalline solid: ESIMS: 163; [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 8.90 (s, 1H), 8.35 (s, 1H), 2.46 (s, 3H).
e) 5-Cyano-3-methyl-pyridine-2-carboxylic acid methyl ester
To a solution of 5-cyano-3-methylpyridine-2-carboxylic acid (2 g, 12.4 mmol) in methanol (20 mL) was added thionyl chloride dropwise under reflux. The mixture was then heated at reflux with stirring. After 60 min, HPLC analysis revealed completion of reaction. To the reaction mixture was added toluene and the mixture was concentrated in vacuo to give the title compound as a pale yellow solid: ESIMS: 177; [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 8.92 (s, 1H), 8.39 (s, 1H), 3.90 (s, 3H), 2.46 (s, 3H).
f) 5-Cyano-3-methyl-pyridine-2-carboxylic acid amide
To a solution of 5-cyano-3-methylpyridine-2-carboxylic acid methyl ester (1 g, 5.6 mmol) in methanol (5 mL) was added ammonia (4 mL, 28 mmol, 7N solution in methanol). The mixture was then heated at 50° C. with stirring in a sealed tube. After 60 min, HPLC analysis revealed completion of reaction. The mixture was concentrated in vacuo to give the title compound as a pale yellow solid: ESIMS: 162; [(M+H)+]; 1H NMR (400 MHz, DMSO-d6): δ 8.87 (d, 1H), 8.30 (d, 1H), 8.09 (br s, 1H), 7.74 (br s, 1H), 2.50 (s, 3H)
g) 5-Cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
50 mg of (R)-5-(5-bromo-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-ylamine, 30 mg of 5-cyano-3-methyl-pyridine-2-carboxylic acid amide, 3.0 mg CuI and 65 mg K3PO4 was charged to the reactor under N2 atomosphere. 1.0 ml of dioxane was added. Followed by 3.0 mg of N1,N2-dimethylethane-1,2-diamine. The resulting reaction mixture was heated to reflux and hold for 23 h. Cooled down to 23° C. then dilute with 15 ml IPAc. The organic phase was washed with water (5 ml×2), concentrated to dry under reduced pressure, Purification via column chromatography on silica gel (IPAc-Heptane 2:1 to 3:1) gave 30 mg of white solid. ESIMS: [M+H]+=403.9, 1H NMR (400 MHz, DMSO-d6): 10.72 (s, 1H), 8.96 (s, 1H), 8.38 (s, 1H), 7.99 (dd, 1H), 7.81 (m, 1H), 7.18 (d, 1H), 6.17 (br s, 2H), 6.15 (t, 1H), 3.98 (m, 4H), 2.53 (s, 3H).
Example 144a
Preparation of 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride hydrate




2.3 g of 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide (5.702 mml) was put in a 4neck flask. In an Erlenmeyer flask 92 ml acetonitrile and 4.6 ml water were added. The mixture was shaken for a few seconds and 561.6 mg of HCl 37% (5.702 mmol) were added. The solution was shaken again for a few seconds and then it was added to the 4neck flask in portions. The mixture was stirred with a paddle and it was heated in a water bath up to 85° C. At 85° C. all the solid material was completely dissolved and a slightly yellow clear solution was obtained. The solution was left at rt to cool down with stirring. Precipitate appeared at 40° C. The suspension was let to stir overnight and it was filtered after 16 hours through a Büchner filter. The isolated material was dried in an oven at rt for 16 h and 1854.5 mg of a white powder was obtained.
Example 152
Crystalline 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide
5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide was dissolved in EtOAc, isopropanol added and the resulting solution concentrated at reduced pressure. This procedure was repeated until most of the product had crystallised.
The resultant crystalline material was analysed by XRPD and the ten most characteristic peaks are shown in Table 18 (see also FIG. 1).












TABLE 18










Relative



Degrees 2-Θ
d-spacing (Å)
Intensity (counts)
Intensity %





















8.29
10.65649
9840
High



10.813
8.17512
5198
Medium



14.077
6.28645
1911
Low



14.525
6.09337
2446
Low



16.624
5.32842
19854
High



18.919
4.68693
3766
Medium



21.453
4.13863
3862
Medium



22.244
3.99323
6947
Medium



23.327
3.81033
4257
Medium



25.436
3.49889
3672
Medium



28.495
3.12985
5558
Medium










X-ray powder diffraction (XRPD) analysis was performed using a Brucker D8 Advance x-ray diffractometer. Measurements were taken at about 30 kV and 40 mA under the following conditions:
















Scan rate (continuous scan):
0.3 s/step (equals 107.1 s step time)



Step size:
0.017° (2Theta)



Soller slit
2.5°



Slits (from left to right):
V12 (variable), 6 mm antiscatter slit










The X-ray diffraction pattern was recorded between 2° and 40° (2 theta) with CuKα radiation for identification of the whole pattern.
The crystalline material was also analysed by differential scanning calorimetry using a PerkinElmer DSC7 and was found to have an onset of melting at about 227° C. (227.46° C.).
Example 153
The compound in Table 19 can be prepared by procedures analogous to those used in examples 71 and 72.










TABLE 19








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







153




11.84 (s, 1H), 10.71 (s, 1H), 9.71 (d, 2H), 7.99 (m, 1H), 7.87 (m, 2H), 7.38 (s, 1H), 7.29 (dd, 1H), 7.19 (br s, 2H), 4.31 (d, 1H), 4.06 (d, 1H), 1.75 (s, 3H), 1.71 (s, 3H)
460, 462



3-Amino-5-chloro-pyridine-2-carboxylic acid





[3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoro-





methyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-





fluoro-phenyl]-amide hydrochloride









Examples 154 to 156
The compounds listed in Table 20 were prepared by a procedure analogous to that used in example 100.










TABLE 20








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







154




11.93 (s, 1H), 9.08 (s, 1H), 8.72 (s, 1H), 7.85 (m, 2H), 7.23 (s, 1H), 4.68-3.93 (m, 4H), 1.82 (s, 3H)
481, 483



3-Chloro-5-trifluoromethyl-pyridine-2-





carboxylic acid [3-(3-amino-6,6-difluoro-





5-methyl-2,5,6,7-tetrahydro-





[1,4]oxazepin-5-yl)-4-fluoro-phenyl]-





amide




 


155




10.49 (s, 1H), 8.33 (s, 1H), 7.95 (s, 1H), 7.86- 7.87 (m, 2H), 7.08 (dd, 1H, J = 11.0 Hz, 8.4 Hz), 5.98 (s, 1H), 4.32-4.05 (m, 3H), 3.96-3.81 (m, 4H), 3.53-3.45 (m, 1H), 1.74 (s, 3H)
487



5-Bromo-3-methoxy-pyridine-2-carboxylic





acid [3-(3-amino-6,6 difluoro-5-methyl-





2,5,6,7 tetrahydro-[1,4]oxazepin-5-yl)-4





fluoro-phenyl]-amide




 


156




10.8 (s, 1H), 9.19 (d, 1H, J = 3.5 Hz), 8.58 (dd, 1H, J = 10.3 Hz, 3.2 Hz), 8.27 (dd, 1H, J = 10.5 Hz, 2.7 Hz), 8.07 (dd, 1H, J = 9.5 Hz, 3.6 Hz), 7.85 (m, 1H), 7.12 (dd, 1H, J = 14 Hz, 10.5 Hz), 7.95 (s, 2 H), 4.31-4.08 (m, 3H), 3.96-3.84 (m, 1H), 1.75 (s, 3H)
404



5-Cyano-pyridine-2-carboxylic acid [3-(3-





amino-6,6-difluoro-5 methyl-2,5,6,7-





tetrahydro[1,4]oxazepin-5-yl)-4 fluoro-





phenyl]-amide









(Note: For example 156 the deprotection of the Boc group was carried out using TFA/DCM (in an analogous manner as for example 112) instead of HCl/dioxane.
Examples 157 to 185
The compounds listed in Table 21 were prepared by procedures analogous to those used in example 42 or example 112.
For enantiomerically pure compounds the racemic precursor [5-(5-amino-2-fluoro-phenyl)-5-difluoromethyl-5,6-dihydro-2H-[1,4]oxazin-3-yl]-carbamic acid tert-butyl ester (example 42j)) was separated via prep-HPLC on Chiralpak AD-H 250×4.6 mm column using supercritical CO2/EtOH 9:1 as an eluent. The desired compound was the slower eluting (R)-enantiomer. Enantiomeric excess=99.7%; [α]D=−109.7° (c=1, CHCl3).










TABLE 21








MS




1H-NMR
[m/z;


Example
Compound
(δ; DMSO-d6)
(M + 1)+]







157




13.85 (s, 1H), 11.2 (s, 1H), 11.15 (s, 1H), 9.88 (s, 1H), 9.55 (s, 1H), 9.25 (s, 1H),  8.91 (s, 1H), 8.1 (m, 1H), 8.00 (m, 1H), 7.95 (s, 1H), 7.45-7.40 (dd, 1H), 6.80 (t, 1H, CHF2), 4.72 (d, 1H, AB-system),  4.67 (d, 1H, AB-system),  4.35 (d, 1H, AB-system),  4.20 (d, 1H, AB-system)
405



7H-Pyrrolo[2,3-d]pyrimidine-6-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


158




10.14 (br s, 1H), 8.03 (d, 1H), 7.75 (br s, 1H), 7.53 (s, 1H), 7.14 (t, 1H), 6.16 (br s, 2H), 4.41 (br. s., 2H), 4.14 (d, 1H), 4.01 (s, 1H), 3.91 (d, 1H), 3.81 (d, 1H), 3.72-3.66 (m, 3H), 3.50 (s, 1H), 3.30 (s, 3H)
4.55



3-Amino-5-(2-methoxy-ethoxy)-pyrazine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide




 


159




10.85 (s, 1H), 9.80 (s, 1H), 8.84 (s, 1H), 8.64 (s, 1H), 8.13-8.08 (m, 3H), 7.94 (d, 1H), 7.38 (dd, 1H), 6.78 (t,  J = 54 Hz, 1H), 4.73 (d, 1H), 4.61 (d, 1H), 4.36 (d, 1H), 4.18 (d, 1H), 2.78 (q, 2H), 1.24 (t, 3H)
393



((R)-5-Difluoromethyl-5-{5-[(5-ethyl-pyridine-





2-carbonyl)-amino]-2-fluoro-phenyl}-5,6-





dihydro-2H-[1,4]oxazin-3-yl)-carbamic acid





tert-butyl ester, hydrochloride




 


160




10.99 (s, 1H), 10.60 (s, 1H), 9.78 (br s, 1H), 8.80 (br s, 1H), 8.05 (d, 1H), 7.93 (d, 1H), 7.86 (s, 1H), 7.42-7.30 (m, 2H), 7.17 (br s, 2H), 6.77 (t, 1H, CHF2), 4.78-4.67 (m, 1H),  4.67-4.57 (m, 1H), 4.34 (d, 1H), 4.16 (d, 1H)
414, 416



3-Amino-5-chloro-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


161




10.6 (s, 1H), 8.33 (s, 1H), 7.97 (m, 1H), 7.78 (m, 1H), 7.72 (s, 1H), 7.17 (dd, 1H), 6.14 (t, 1H), 6.13 (br s, 2H), 4.15 (d, 1H), 4.02 (d, 1H),  3.93 (s, 3H), 3.91 (d, 1H), 3.83 (d, 1H) 
429, 431



3-Chloro-5-methoxy-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


162




12.20 (s, 1H), 11.02 (s, 1H),  10.32 (s, 1H), 9.78 (s, 1H), 8.79 (s, 1H), 8.24 (s, 1H), 7.97 (dd, 1H), 7.92 (dd, 1H), 7.79 (m, 1H), 7.35 (t, 1H), 6.77 (t, 1H, CHF2), 6.41 (d, 1H), 4.72 (d, 1H, AB-system), 4.65 (d, 1H, AB-system), 4.32 (d, 1H, AB-system), 4.18 (d, 1H, AB-system)
381



6-Oxo-1,6-dihydro-pyridine-3-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


163




10.30 (s, 1H), 9.30 (s, 1H), 8.21 (s, 1H), 8.09 (m, 1H), 7.90 (s, 1H), 7.87 (m, 1H), 7.18 (dd, 1H), 7.05 (t, 1H), 6.83 (d, 1H), 6.18 (s, NH2), 6.14 (t, 1H, CHF2), 4.12 (d, 1H, AB-system), 4.02 (d, 1H, AB-system), 3.93 (d, 1H, AB-system), 3.82 (d, 1H, AB-system)
404



Pyrrolo[1,2-c]pyrimidine-3-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


164




11.02 (s, 1H), 10.78 (s, 1H), 9.66 (s, 1H), 8.91 (s, 1H), 8.78 (s, 1H), 8.46 (s, 1H), 8.11 (d, 1H), 8.03 (dd, 1H), 7.37 (dd, 1H), 6.77 (t, 1H, CHF2), 5.08 (d, 2H), 4.76-4.67 (m, 1H), 4.67-4.58 (m, 1H), 4.33 (d, 1H), 4.17 (d, 1H), 1.84 (s, 3H)
434



5-But-2-ynyloxy-pyrazine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


165




10.98 (s, 1H), 10.13 (s, 1H), 9.74 (s, 1H), 8.72 (s, 1H), 8.04 (d, 1H), 7.95-7.91 (m, 2H), 7.52 (s, 1H), 7.36 (dd, 1H), 7.12 (br, 2H), 6.78 (t, J = 54 Hz, 1H), 4.72 (d, 1H), 4.64 (d, 1H), 4.32 (d, 1H), 4.15 (d, 1H)
458, 460



3-Amino-5-bromo-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


166




11.15 (s, 1H), 11.07 (s, 1H), 9.98 (s, 1H), 9.09 (s, 1H), 7.96 (m, 2H), 7.73 (s, 1H), 7.37 (m, 2H), 6.74 (t, 1H, CHF2), 4.71 (d, 1H), 4.63 (d, 1H), 4.47 (q, 2H), 4.31 (d, 1H), 4.14 (d, 1H), 1.37 (t, 2H) 
382



1-Ethyl-1H-imidazole-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


167




10.54 (br s, 1H), 8.90 (s, 1H), 8.49 (s, 1H), 8.14 (dd, 1H), 7.81 (br s, 1H), 7.19 (t, 1H), 6.24-6.06 (m, 3H), 5.14 (d, 2H), 4.12 (d, 1H), 4.03-4.01 (m, 1H), 3.94-3.91 (m, 1H), 3.84 (d, 1H), 3.66 (s, 1H)
420



5-Prop-2-ynyloxy-pyrazine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


168




10.96 (s, 1H), 9.79 (s, 1H), 9.62 (s, 1H), 8.80 (s, 1H), 8.00-7.96 (m, 1H), 7.92 (d, 1H), 7.33-7.20 (m, 1H), 7.00 (br s, 1H), 6.76 (t, 1H, CHF2), 4.76-4.56 (m, 2H), 4.32 (d, 1H), 4.14 (d, 1H), 2.31 (s, 3H)
384



5-Amino-2-methyl-oxazole-4-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


169




11.1 (d, 1H), 9.68 (s, 1H), 8.84 (s, 1H), 8.28 (s, 1H), 8.0 (m, 2H), 7.73 (s, 1H), 7.40 (dd, 1H), 6.77 (t, 1H), 4.67 (d, 1H), 4.63 (d, 1H), 4.34 (d, 1H), 4.17 (d, 1H)
415, 417



5-Chloro-3-hydroxy-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


170




10.49 (br s, 1H), 8.85 (s, 1H), 8.33 (s, 1H), 8.13 (d, 1H), 7.80 (br s, 1H), 7.19 (dd, 1H), 6.15 (br s, 2H), 6.13 (t, 1H), 5.34 (m, 1H), 4.16 (d, 1H), 4.02 (d, 1H), 3.87 (d, 1H), 3.71 (d, 1H), 1.35 (d, 6H)
424



5-Isopropoxy-pyrazine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


171




10.49 (br s, 1H), 8.87 (s, 1H), 8.37 (s, 1H), 8.17 (d, 1H), 7.81 (br s, 1H), 7.18 (dd, 1H), 6.16 (br s, 2H), 6.14 (t, 1H), 4.43 (t, 2H), 3.7-4.2 (m, 4H), 1.35 (t, 3H)
410



5-Ethoxy-pyrazine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide




 


172




11.07 (s, 1H), 10.80 (br s, 1H), 10.75 (s, 1H), 9.84 (s, 1H), 8.88 (s, 1H), 8.09-7.94 (m, 3H), 7.84-7.70 (m, 2H), 7.40 (dd, 1H), 6.79 (t, 1H, CHF2), 4.80-4.70 (m, 2H), 4.41-4.30 (m, 3H), 4.19 (d, 1H), 2.72 (s, 3H), 2.71 (s, 3H), 2.61 (s, 3H)
475



5-Dimethylaminomethyl-3-methyl-





benzofuran-2-carboxylic acid [3-((R)-5-





amino-3-difluoromethyl-3,6-dihydro-2H-





[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide hydrochloride




 


173




11.04 (s, 1H), 10.57 (s, 1H), 9.87 (s, 1H), 8.93 (s, 1H), 7.99 (m, 2H), 7.31 (m, 2H), 6.74 (t, 1H, CHF2), 4.70 (d, 1H), 4.62 (d, 1H), 4.31 (d, 1H), 4.14 (d, 1H), 3.98 (s, 3H), 2.54 (s, 3H)
383



1,5-Dimethyl-1H-[1,2,3]triazole-4-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


174




10.99 (s, 1H), 10.68 (s, 1H), 9.75 (s, 1H), 8.74 (s, 1H), 8.26 (s, 1H), 8.06-7.92 (m, 2H), 7.44-7.32 (m, 1H), 6.78 (t, 1H, CHF2), 4.78-4.68 (m, 2H), 4.34 (d, 1H), 4.18 (d, 1H), 4.00 (s, 3H), 2.77 (s, 3H)
410



5-Methoxy-3-methyl-pyrazine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


175




10.98 (s, 1H), 10.41 (s, 1H), 9.76 (s, 1H), 8.77 (s, 1H), 8.14-7.98 (m, 1H), 7.98-7.82 (m, 1H), 7.54 (s, 1H), 7.34 (dd, 1H), 4.80-4.67 (m, 1H), 4.67-4.53 (m, 1H), 4.34 (d, 1H), 4.16 (d, 1H), 3.91 (s, 3H)
411



3-Amino-5-methoxy-pyrazine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


176




10.91 (br s, 1H), 10.75 (s, 1H), 9.66 (br s, 1H), 8.59 (br s, 1H), 8.44 (d, 1H), 8.00-7.98 (m, 2H), 7.75 (d, 1H), 7.45 (t, 1H), 7.41-7.35 (m, 1H), 6.79 (t, 1H), 4.71 (d, 1H), 4.64 (d, 1H), 4.34 (d, 1H), 4.18 (d, 1H), 2.61 (s, 3H)
445



5-Difluoromethoxy-3-methyl-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide hydrochloride




 


177




10.92 (br s, 1H), 10.70 (s, 1H), 9.67 (br s, 1H), 8.61 (br s, 1H), 8.38 (d, 1H), 8.00-7.98 (m, 2H), 7.65 (d, 1H), 7.41-7.35 (m, 1H), 6.79 (t, 1H), 6.03 (d, 2H), 4.71 (d, 1H), 4.65 (d, 1H), 4.35 (d, 1H), 4.18 (d, 1H), 2.63 (s, 3H)
427



5-Fluoromethoxy-3-methyl-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide hydrochloride




 


178




10.98 (s, 1H), 10.68 (s, 1H), 9.74 (s, 1H), 8.72 (br s, 1H), 8.28 (s, 1H), 8.06-7.91 (m, 2H), 7.37 (dd, 1H), 6.78 (t, 1H, CHF2), 4.72-4.63 (m, 2H), 4.57-4.48 (m, 2H), 4.34 (d, 1H), 4.18 (d, 1H), 3.79-3.63 (m, 2H), 3.31 (s, 3H), 2.76 (s, 3H)
454



5-(2-Methoxy-ethoxy)-3-methyl-pyrazine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide hydrochloride




 


179




11.00 (s, 1H), 10.48 (s, 1H), 9.77 (s, 1H), 8.75 (s, 1H), 8.01 (d, 1H), 7.97 (s, 1H), 7.91-7.87 (m, 1H), 7.34 (t, 1H), 7.22 (br, 2H), 6.78 (t, J = 54 Hz, 1H), 4.69 (d, 1H), 4.65 (d, 1H), 4.33 (d, 1H), 3.94 (s, 3H), 3.89 (s, 3H)
425



3,5-Dimethoxy-pyridine-2-carboxylic acid





[3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


180




10.98 (br s, 1H), 10.74 (s, 1H), 9.76 (br s, 1H), 8.74 (br s, 1H), 8.42 (d, 1H), 8.13 (d, 1H), 8.10-8.05 (m, 2H), 7.65 (dd, 1H), 7.37 (dd, 1H), 6.79 (t, 1H), 4.72 (d, 1H), 4.64 (d, 1H), 4.34 (d, 1H), 4.31-4.28 (m, 2H), 4.17 (d, 1H), 3.73-3.69 (m, 2H), 3.32 (s, H) 
439



5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic





acid [3-((R)-5-amino-3-difluoromethyl-3,6-





dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-





phenyl]-amide hydrochloride




 


181




10.99 (br s, 1H), 10.67 (s, 1H), 9.75 (br s, 1H), 8.72 (br s, 1H), 8.31 (d, 1H), 8.03 (d, 1H), 8.00-7.94 (m, 1H), 7.66 (dd, 1H), 7.37 (dd, 1H), 6.79 (t, 1H), 4.71 (d, 1H), 4,64 (d, 1H), 4.37-4.29 (m, 3H), 4.18 (d, 1H), 3.72-3.69 (m, 2H), 3.32 (s, 3H)
457



3-Fluroro-5-(2-methoxy-ethoxy)-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide hydrochloride




 


182




10.94 (s, 1H), 10.70 (s, 1H), 9.69 (s, 1H), 8.64 (s, 1H), 8.30 (s, 1H), 7.98 (d, 2H), 7.38 (t, 1H), 6.79 (t, 1H CHF2), 5.08 (br s, 2H), 4.75-4.59 (m, 2H), 4.34 (d, 1H), 4.18 (d, 1H), 2.76 (s, 3H),  1.86 (s, 3H) 
448



5-But-2-ynyloxy-3-methyl-pyrazine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide hydrochloride




 


183




11.21 (s, 1H), 10.96 (s, 1H), 9.95 (s, 1H), 9.09 (s, 1H), 8.59 (s, 1H), 8.04 (s, 1H), 7.94 (m, 1H), 7.90 (d, 1H), 7.40 (dd, 1H), 6.79 (t, 1H), 4.71 (m, 2H), 4.55 (s, 2H), 4.33 (d, 1H), 4.44 (d, 1H), 3.37 (s, 3H)
443, 445



3-Chloro-5-methoxymethyl-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide hydrochloride




 


184




11.06 (s, 1H), 10.89 (s, 1H), 9.78 (s, 1H), 8.79 (s, 1H), 8.52 (s, 1H), 7.99 (s, 1H), 7.95 (d, 1H), 7.91 (m, 1H), 7.40 (dd, 1H), 6.79 (t, 1H), 6.08 (d, 2H), 4.71 (m, 2H),  4.34 (d, 1H), 4.23 (d, 1H)
447, 449



3-Chloro-5-fluoromethoxy-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide hydrochloride




 


185




11.07 (s, 1H). 10.93 (s, 1H), 9.76 (s, 1H), 8.82 (s, 1H), 8.60 (s, 1H), 8.16 (s, 1H), 7.91 (m, 2H), 7.51 (t, 1H), 7.40 (m, 1H), 6.79 (t, 1H), 4.73 (m, 2H), 4.33 (d,1H), 4.23 (d, 1H)
465, 467



3-Chloro-5-difluoromethoxy-pyridine-2-





carboxylic acid [3-((R)-5-amino-3-





difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-





yl)-4-fluoro-phenyl]-amide hydrochloride









Preparation of Intermediates

The substituted acid building blocks were either commercially available or can be prepared as described in the literature or in an analogous manner, e.g. WO 2005063738, WO 2009091016, WO 2010047372, Bioorg. Med. Chem. 2001, 9, 2061-2071, or can be prepared as described hereafter or in an analogous manner.
Acid-1: 5-Cyano-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid
a) 5-Bromo-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid
A suspension of 2.16 g (0.00 mmol) 5-bromo-3-methyl-pyridine-2-carboxylic acid in 36 ml of D2O (99.96% D) was treated with 4 ml of a 40% solution of NaOD in D2O. The homogeneous solution was heated in a 100 ml Teflon vessel with a Synthos 3000 Microwave apparatus. The mixture was heated at 160° C. for 5 h and cooled down. 1H-NMR and MS analises of the product showed that deuteration had progressed to a high degree. Only minor amounts of tetradeutero derivatives were present. The reaction mixture was acidified to pH3 with 2N HCl and extracted with EtOAc. The organic phase was dried with MgSO4.H2O and evaporated to give the title compound as a white solid, pure enough for further transformations.
HPLC: RtH2=2.829 min; ESIMS [M+H]+=221, 223 (1Br, 5D);
b) 5-Bromo-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid tert-butyl ester
A solution of 1.65 g (7.46 mmol) 5-bromo-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid and two drops of DMF were dissolved in 17 ml DCM. Oxalyl chloride (1.3 ml, 14.9 mmol) was added dropwise. The development of gas started immediately. After stirring for 2 h at 25° C. the mixture was evaporated, taken up in toluene and evaporated again. The residual brownish resin was dissolved in 3 ml THF and added to a stirred solution of 14 ml (22.39 mmol) BuLi (1.6 M in hexane) in 24 ml t-BuOH. After 1 h the mixture was poured onto 10% aqueous NH4Cl and extracted with TBME. The organic layer was washed with brine, dried with MgSO4.H2O and evaporated. Chromatography on silica gel (hexane/EtOAc 9:1) provided the title compound as a colorless liquid.
HPLC: RtH1=3.002 min; ESIMS [M+H]+=277, 279 (1Br, 5D);
1H-NMR (360 MHz, CDCl3): 1.65 (s, 9H).
c) 5-Cyano-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid tert-butyl ester
A mixture of 1.41 g (5.09 mmol) 5-bromo-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid tert-butyl ester, 0.418 g (3.56 mmol) Zn(CN)2, 0.033 g Zn powder (0.509 mmol) and 0.265 g (0.254 mmol) Pd2(dba)3.CHCl3 were suspended in 14 ml DMF under nitrogen atmosfere. A 0.25 M solution of tBu3P in dioxane (4.0 ml, 1.02 mmol) was added and the mixture was stirred for 16 h at 60° C. After being cooled down the mixture was diluted with TBME, filtered over celite and washed with brine three times. The crude product was purified by column chromatography on silica gel (hexane/EtOAc 5-15%) to give the title compound as an off white solid.
HPLC: RtH3=3.275 min; ESIMS [M+Na]+=246 (5D);
1H-NMR (360 MHz, CDCl3): 1.68 (s, 9H);
Ft-IR: 2231 cm−1 (CN).
d) 5-Cyano-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid
To a solution of 825 mg (3.69 mmol) 5-cyano-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid tert-butyl ester in 5.1 g (37 mmol) 1,3-dimethoxybenzene were added 8.3 ml TFA and stirred for 6.5 h. The reaction mixture was diluted with toluene and evaporated. The residue was taken up in toluene and evaporated (2×). The product was crystallized from TBME/hexane to give the title compound as a white powder.
HPLC: RtH2=2.397 min; ESIMS [M+H]+=168 (5D);
1H-NMR (360 MHz, CDCl3): non-deuterated impurities.
Acid-2: 5-Chloro-4,6-dideutero-3-trideuteromethyl-pyridine-2-carboxylic acid
The title compound was prepared by an analogous procedure as Acid-1 steps a) to b).
HPLC: RtH2=2.820 min; ESIMS [M+H]+=177 (5D);
1H-NMR (360 MHz, D2O): non deuterated impurities.
Acid-3: 5-Cyano-3-methyl-pyridine-2-carboxylic acid
The title compound was prepared by an analogous procedure to Acid-1 starting with 5-bromo-3-methyl-pyridine-2-carboxylic acid instead of the deuterated derivative [Acid-1 step a)].
Rf (hexanes/EtOAc 6:1)=0.28
1H-NMR (360 MHz, CDCl3): 8.09 (dd, 1H), 7.79 (ddd, 1H), 7.17 (t, 1H), 6.44 (t, J=45 Hz, 1H).
Acid-4: 3,5-Dimethoxy-pyridine-2-carboxylic acid
A suspension of 3,5-dimethoxy-pyridine-2-carbonitrile (CAS: 36057-45-1, 2.71 g, 16.51 mmol) in 45 ml MeOH and 65 ml 30% aq NaOH was refluxed for 6 h. MeOH was removed by evaporation and the residue was washed with TBME. The aq phase was acidified with conc. HCl till the pH was 3. The mixture was extracted with EtOAc and THF. The combined org layers were dried with sodium sulfate and evaporated. The brown solid was crystallized from EtOH to provide the title compound as pale brown crystals.
HPLC: RtH2=2.183 min; ESIMS [M+H]+=184;
1H-NMR (360 MHz, DMSO-d6): 12.61 (s, 1H), 3.93 (s, 3H), 3.88 (s, 3H).
Acid-5: 5-Difluoromethoxy-3-methyl-pyridine-2-carboxylic acid
a) 5-Difluoromethoxy-3-methyl-pyridine-2-carbonitrile
A solution of 5-hydroxy-3-methyl-pyridine-2-carbonitrile (CAS registry 228867-86-5) (228 mg, 1.70 mmol), sodium chlorodifluoroacetate (CAS registry 1895-39-2) (518 mg, 3.40 mmol) and K2CO3 (705 mg, 5.10 mmol) in DMF (7 ml) was stirred for 0.5 h at 100° C. The reaction mixture was diluted with EtOAc and washed with saturated aqueous NH4Cl soln. and brine. The aqueous layers were reextracted with EtOAc, the combined organic layers dried over Na2SO4, filtrated and the filtrate was concentrated. The title compound was obtained as a colourless oil after flash chromatography on silica gel (cyclohexane/EtOAc gradient 0-3 min 95:5, 3-35 min 95:5 to 60:40).
HPLC RtH10=0.87 min; ESIMS: 185 [(M+H)+];
1H NMR (400 MHz, CDCl3): 8.40 (d, 1H), 7.45 (d, 1H), 6.64 (t, 1H), 2.61 (s, 3H).
b) 5-Difluoromethoxy-3-methyl-pyridine-2-carboxylic acid
To a solution of 5-difluoromethoxy-3-methyl-pyridine-2-carbonitrile (145 mg, 0.787 mmol) in EtOH (5 ml) was added 1M aqueous NaOH soln. (2.5 ml). The reaction mixture was stirred for 7 h at 70° C., then for 9 h at room temperature. It was diluted with Et2O and twice extracted with water. The combined aqueous layers were reextracted with Et2O, acidified to pH 2 with 1M aqueous HCl and twice extracted with TBME. The combined organic layers were dried over Na2SO4, filtrated and the filtrate was concentrated to yield the title compound as a white solid which was used for the next step without further purification.
HPLC RtH10=0.61 min; ESIMS: 204 [(M+H)+];
1H NMR (400 MHz, MeOD): 8.32 (d, 1H), 7.61 (d, 1H), 7.06 (t, 1H), 2.64 (s, 3H).
Acid-6: 5-Fluoromethoxy-3-methyl-pyridine-2-carboxylic acid
a) 5-Fluoromethoxy-3-methyl-pyridine-2-carbonitrile
To a solution of 5-hydroxy-3-methyl-pyridine-2-carbonitrile (CAS registry 228867-86-5) (228 mg, 1.70 mmol) in DMF (10 ml) was added a solution of toluene-4-sulfonic acid fluoromethyl ester (CAS registry 114435-86-8) (521 mg, 2.55 mmol) and Cs2CO3 (1.386 g, 4.26 mmol) in DMF (4 ml). The reaction mixture was stirred for 1 h at 100° C., then for 1 h at 70° C., diluted with EtOAc and washed with saturated aqueous NH4Cl soln. and brine. The aqueous layers were reextracted with EtOAc, the combined organic layers dried over Na2SO4, filtrated and the filtrate was concentrated. The title compound was obtained as a white solid after flash chromatography on silica gel (cyclohexane/EtOAc gradient 0-3 min 95:5, 3-30 min 95:5 to 65:35).
HPLC RtH10=0.77 min; ESIMS: 167 [(M+H)+];
1H NMR (400 MHz, CDCl3): 8.36 (d, 1H), 7.34 (d, 1H), 5.79 (d, 2H), 2.59 (s, 3H).
b) 5-Fluoromethoxy-3-methyl-pyridine-2-carboxylic acid
To a solution of 5-fluoromethoxy-3-methyl-pyridine-2-carbonitrile (118 mg, 0.71 mmol) in EtOH (4 ml) was added 1M aqueous NaOH soln. (2 ml). The reaction mixture was stirred for 7 h at 70° C., then for 9 h at room temperature. It was diluted with TBME and twice washed with water. The combined aqueous layers were reextracted with TBME, acidified to pH 2 with 1M aqueous HCl and twice extracted with TBME. The combined organic layers were dried over Na2SO4, filtrated and the filtrate was concentrated to yield the title compound as a white solid which was used for the next step without further purification.
HPLC RtH10=0.50 min; ESIMS: 186 [(M+H)+]
1H NMR (400 MHz, MeOD): 8.28 (d, 1H), 7.55 (d, 1H), 5.88 (d, 2H), 2.66 (s, 3H).
Acid-7: 5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic acid
a) 5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic acid methyl ester
To a precooled solution of 5-hydroxy-pyridine-2-carboxylic acid methyl ester (CAS registry 30766-12-2) (150 mg, 0.980 mmol) and 2-methoxyethanol (82 mg, 0.085 ml, 1.077 mmol) in THF (10 ml) was added at 0° C. triphenylphosphine (397 mg, 1.469 mmol) and the reaction mixture was stirred for 10 min at 0° C. A solution of DIAD (316 mg, 1.469 mmol) in THF (5 ml) was added and the mixture was stirred at room temperature for 19.5 h. After dilution with EtOAc, the crude mixture was extracted with water and brine, the aqueous layers were reextracted with EtOAc, the combined organic extracts dried over Na2SO4, filtered and the filtrate concentrated to yield the title compound after flash chromatography on silica gel (DCM/EtOAc gradient 0-3 min 60:40; 3-35 min 60:40 to 25:75).
HPLC RtH10=0.63 min; ESIMS: 212 [(M+H)+];
1H NMR (400 MHz, CDCl3): 8.47 (d, 1H), 8.14 (d, 1H), 7.35 (dd, 1H), 4.27-4.24 (m, 2H), 4.00 (s, 3H), 3.82-3.79 (m, 2H), 3.47 (s, 3H).
b) 5-(2-Methoxy-ethoxy)-pyridine-2-carboxylic acid
To a solution of 5-(2-methoxy-ethoxy)-pyridine-2-carboxylic acid methyl ester (390 mg, 0.489 mmol) in THF (3 ml) was added 1M aqueous NaOH (0.538 ml). The reaction mixture was stirred at room temperature for 2.5 h, concentrated, the residue was dissolved in EtOAc and washed twice with water. The aqueous layers were acidified with 1M aqueous HCl (0.538 ml) and the title compound was isolated by lyophilisation.
HPLC RtH10=0.42 min; ESIMS: 198 [(M+H)+];
1H NMR (400 MHz, DMSO-d6): 8.37 (d, 1H), 8.01 (d, 1H), 7.52 (dd, 1H), 4.28-4.24 (m, 2H), 3.71-3.67 (m, 2H), 3.31 (s, 3H).
Acid-8: 3-Fluoro-5-(2-methoxy-ethoxy)-pyridine-2-carboxylic acid
a) 2-Chloro-3-fluoro-5-(2-methoxy-ethoxy)-pyridine
To a solution of 6-chloro-5-fluoro-pyridin-3-ol (CAS registry 870062-76-3) (800 mg, 5.42 mmol), 2-methoxy-ethanol (454 mg, 0.471 ml, 5.96 mmol) and triphenylphosphine (2.199 g, 8.13 mmol) in THF (40 ml) was added dropwise a solution of DIAD (1.731 g, 8.13 mmol) in THF (20 ml) while keeping the temperature at 0-5° C. The reaction mixture was stirred for 20 h at room temperature, water and brine were added and the mixture was diluted with EtOAc. The aqueous layer was twice extracted with EtOAc, the combined organic layers were dried over Na2SO4, filtered, the filtrate was concentrated and yielded after trituration with Et2O and filtration, the title compound as a white solid. The filtrate yielded another batch of the product after purification by prep. NP HPLC using an Alltech Grom Saphir 65 Si 10 μM 250×50 mm column (heptane/EtOAc, gradient 0-1.7 min 15% EtOAc, 1.7-17 min 15-100% EtOAc, 17-24.3 min 100% EtOAc, 24.3-27.8 min 0% EtOAc).
HPLC RtH10=0.86 min; ESIMS: 206 [(M+H)+];
1H NMR (400 MHz, CDCl3): 7.97 (d, 1H), 7.12 (dd, 1H), 4.25-4.08 (m, 2H), 3.83-3.68 (m, 2H), 3.46 (s, 3H).
b) 3-Fluoro-5-(2-methoxy-ethoxy)-pyridine-2-carbonitrile
To a solution of 2-chloro-3-fluoro-5-(2-methoxy-ethoxy)-pyridine (806 mg, 3.92 mmol) and Zn(CN)2 (486 mg, 4.12 mmol) was added under a N2 atmosphere Pd(PPh3)4 (362 mg, 0.314 mmol). The reaction mixture was stirred for 20 min at 120° C. in a microwave, diluted with water and TBME. The insolubles were filtered, the phases were separated and the aqueous layer was extracted twice with TBME. The combined organic layers were washed with brine, dried over Na2SO4, filtered and the solvent was removed to leave the title compound as a pale brown oil that was purified by prep. NP HPLC using an Alltech Grom Saphir 65 Si 10 μM 250×50 mm column (heptane/EtOAc, gradient 0-1.7 min 25% EtOAc, 1.7-17 min 25-100% EtOAc, 17-24.3 min 100% EtOAc, 24.3-27.8 min 0% EtOAc).
HPLC RtH10=0.78 min; ESIMS: 197 [(M+H)+];
1H NMR (400 MHz, CDCl3): 8.27 (dd, 1H), 7.10 (dd, 1H), 4.34-4.17 (m, 2H), 3.87-3.71 (m, 2H), 3.45 (s, 3H).
c) 3-Fluoro-5-(2-methoxy-ethoxy)-pyridine-2-carboxylic acid
A solution of 3-fluoro-5-(2-methoxy-ethoxy)-pyridine-2-carbonitrile in 5 ml aqueous 2M NaOH was stirred at 120° C. for 20 min in a microwave. The reaction mixture was diluted with H2O and the pH was adjusted to 1-1.5. The mixture was extracted with DCM three times and the combined organic phases were dried over Na2SO4, filtered and the solvent was removed to yield the crude title compound that was purified by prep. RP HPLC using a Waters SunFire C18 OBD 5 μM 19×150 mm column (NB: water/ACN+0.1% TFA, gradient 0-1 min 5% B, 1-7 min 5 to 90% B, 7-7.5 min 90% B, 7.5-8 min 90 to 5% B, 8-10 min 5% B) to yield its TFA salt.
HPLC RtH10=0.50 min; ESIMS: 216 [(M+H)+];
1H NMR (400 MHz, CDCl3): 8.22 (br s, 1H), 7.15 (dd, 1H), 6.29 (br s, 2H), 4.38-4.19 (m, 2H), 3.89-3.74 (m, 2H), 3.47 (s, 3H).
The TFA salt was converted to the corresponding HCl salt by trituration with HCl/dioxane and subsequent evaporation.
Acid-9: 5-Methoxy-3-methyl-pyrazine-2-carboxylic acid
a) 3-Methyl-4-oxy-pyrazine-2-carboxylic acid methyl ester
To a solution of 2.0 g (13.14 mmol) 3-methyl-pyrazine-2-carboxylic acid methyl ester in 40 ml CHCl3 was added 3.24 g (13.14 mmol) meta-chlorperoxybenzoic acid and the resulting mixture was heated to reflux for 1.5 h. The reaction mixture was basified with saturated aqueous NaHCO3 and extraced with CHCl3, the combined organic layers were dried with Na2SO4 and evaporated. The residue was purified by chromatography on silica gel (DCM to DCM/MeOH 9:1) to provide the title compound as colorless solid.
HPLC: RtH11=0.40 min; ESIMS [M+H]+=169;
1H NMR (600 MHz, DMSO-d6): 8.56 (d, 1H), 8.48 (d, 1H), 3.33 (s, 3H).
b) 5-Chloro-3-methyl-pyrazine-2-carboxylic acid methyl ester
To a solution of 575 mg (3.4 mmol) 3-methyl-4-oxy-pyrazine-2-carboxylic acid methyl ester in 6.8 ml DMF was added 1.141 ml (1.88 g, 12.24 mmol) phosphoryl trichloride and the resulting mixture was heated to 120° C. for 15 min. After cooling to room temperature ice was added and the mixture was extracted with toluene. The combined organic layers were washed with halfsaturated aqueous NaCl, dried with Na2SO4 and evaporated to provide the title compound as brownish solid in a  ̃3:2 mixture with the undesired 6-chloro-3-methyl-pyrazine-2-carboxylic acid methyl ester. The mixture was used in the next step without further purification.
HPLC: RtH10=0.70 min; ESIMS [M+H]+=187.1;
1H NMR (600 MHz, DMSO-d6, 5-Cl isomer): 8.74 (s, 1H), 3.90 (s, 3H), 2.71 (s, 3H).
c) 5-Methoxy-3-methyl-pyrazine-2-carboxylic acid methyl ester
At 0° C. 58 mg (1.458 mmol) 60% sodium hydride in oil was added in portions to 7.3 ml MeOH and the mixture was stirred at room temperature for 30 min. After re-cooling to 0° C. 272 mg (1.458 mmol) of the crude product of the previous step was added as a suspension in 1.7 ml MeOH and the mixture was heated to 50° C. for 1 h. At 0° C. halfsaturated aqueous NH4Cl was added and the mixture was extracted with EtOAc. The combined organic layers were washed with halfsaturated aqueous NaCl, dried with Na2SO4 and evaporated. The residue was purified by chromatography on silica gel (cyclohexane to cyclohexane/EtOAc 4:1) to provide the title compound as brownish solid.
HPLC: RtH10=0.69 min; ESIMS [M+H]+=183.1;
1H NMR (600 MHz, DMSO-d6): 8.21 (s, 1H), 3.97 (s, 3H), 3.84 (s, 3H), 2.67 (s, 3H).
d) 5-Methoxy-3-methyl-pyrazine-2-carboxylic acid
A solution of 105 mg (0.577 mmol) 5-methoxy-3-methyl-pyrazine-2-carboxylic acid methyl ester in 2.6 ml THF was cooled to 0° C., 0.635 ml (0.635 mmol) 1N sodium hydroxide was added dropwise and the mixture was stirred at room temperature for 1.5 h.
After re-cooling to 0° C. 0.635 ml (0.635 mmol) 1N HCl and 1.2 ml toluene were added and the solvents were evaporated to provide the title compound together with sodium chloride as brownish solid. The mixture was used for coupling reactions without further purification.
HPLC: RtH10=0.50 min; ESIMS [M+H]+=169.1;
1H NMR (600 MHz, DMSO-d6): 13.04 (br s, 1H), 8.19 (s, 1H), 3.96 (s, 3H), 2.67 (s, 3H).
Acid-10: 5-(2-Methoxy-eth oxy)-3-methyl-pyrazine-2-carboxylic acid
The title compound was prepared by an analogous procedure to Acid-9 using 2-methoxy-ethanol instead of methanol [Acid-9 step c)].
HPLC: RtH10=0.54 min; ESIMS [M+H]+=213.1;
1H NMR (600 MHz, DMSO-d6): 13.04 (br. s., 1H), 8.20 (s, 1H), 4.54-4.40 (m, 2H), 3.80-3.61 (m, 2H), 3.30 (s, 3H), 2.66 (s, 3H).
Acid-11: 5-But-2-ynyloxy-3-methyl-pyrazine-2-carboxylic acid
The title compound was prepared by an analogous procedure to Acid-9 using but-2-yn-1-ol instead of methanol [Acid-9 step c)].
HPLC: RtH10=0.78 min; ESIMS [M+H]+=207.0;
1H NMR (360 MHz, DMSO-d6): 8.23 (s, 1H), 5.06 (d, 2H), 2.68 (s, 3H), 1.87 (t, 3H).
Acid-12: 3-Amino-5-methoxy-pyrazine-2-carboxylic acid
a) 3-Amino-5-methoxy-pyrazine-2-carboxylic acid methyl ester
At 0° C. 75 mg (1.866 mmol) 60% sodium hydride in oil was added in portions to 5 ml MeOH and the mixture was stirred at room temperature for 30 min. After re-cooling to 0° C. 350 mg (1.866 mmol) 3-amino-5-chloro-pyrazine-2-carboxylic acid methyl ester (GB 1248146) was added and the mixture was allowed to warm to room temperature and stirred over night. Saturated aqueous NH4Cl was added and the mixture was extracted with DCM and EtOAc, the combined organic layers were washed with saturated aqueous sodium chloride, dried with Na2SO4 and evaporated. The residue was purified by chromatography on silica gel (cyclohexane to EtOAc) to provide the title compound as colorless solid.
HPLC: RtH10=0.61 min; ESIMS [M+H]+=184.2;
1H-NMR (360 MHz, DMSO-d6): 7.52 (s, 1H), 7.49 (br s, 2H), 3.91 (s, 3H), 3.81 (s, 3H).
b) 3-Amino-5-methoxy-pyrazine-2-carboxylic acid
To a solution of 200 mg (1.092 mmol) 3-amino-5-methoxy-pyrazine-2-carboxylic acid methyl ester in 4 ml THF was added 1.20 ml (1.20 mmol) 1N sodium hydroxide and the mixture was stirred at room temperature for 29 h. To the mixture were added 1.09 ml (1.09 mmol) 1N HCl after stirring for 5 min toluene was added and the solvents were evaporated to provide the title compound together with sodium chloride as colorless solid. The mixture was used for coupling reactions without further purification.
HPLC: RtH11=0.52 min; ESIMS [M+H]+=170.0;
1H NMR (600 MHz, DMSO-d6): 12.48 (br s, 1H), 7.57 (br s, 2H), 7.48 (s, 1H), 3.88 (s, 3H).
Acid-13: 5-tert-Butoxycarbonylamino-2-methyl-oxazole-4-carboxylic acid
a) 5-tert-Butoxycarbonylamino-2-methyl-oxazole-4-carboxylic acid ethyl ester
To a solution of 221 mg (1.3 mmol) 5-amino-2-methyl-oxazole-4-carboxylic acid ethyl ester in 6.5 ml acetonitrile was added at 0° C. 0.795 ml (4.55 mmol) DIPEA, 31.8 mg (0.26 mmol) DMAP and 709 mg (3.25 mmol) Boc2O and the mixture was stirred at 45° C. for 2 days. After cooling to room temperature water was added and the mixture was extracted with DCM. The combined organic layers were washed with 1N HCl and halfsaturated aqueous NaCl, dried with Na2SO4 and evaporated. The residue was purified by chromatography on silica gel (cyclohexane to cyclohexane/EtOAc 1:1) to provide the title compound as pinkish solid.
HPLC: RtH10=1.21 min; ESIMS [M+H]+=271.1.
b) 5-tert-Butoxycarbonylamino-2-methyl-oxazole-4-carboxylic acid
To a solution of 314 mg (1.163 mmol) 5-tert-butoxycarbonylamino-2-methyl-oxazole-4-carboxylic acid ethyl ester in 1.16 ml THF was added at 0° C. 5.82 ml (5.82 mmol) 1N sodium hydroxide, the mixture was allowed to warm to room temperature and stirring was continued for 6 days. At 0° C. 5.82 ml (5.82 mmol) 1N HCl was added and the solvents were evaporated. The residue was suspended in DCM and filtered, the solvent was evaporated to provide the title compound as colorless solid.
HPLC: RtH10=0.62 min; ESIMS [M−H]−=241.0;
1H NMR (600 MHz, DMSO-d6): 12.80 (br s, 1H), 9.56 (br s, 1H), 2.35 (s, 3H), 1.42 (s, 9H).
Acid-14: 3-Chloro-5-fluoromethoxy-pyridine-2-carboxylic acid
a) 3-Chloro-5-hydroxy-pyridine-2-carbonitrile
To a solution of acetic acid 5,6-dichloro-pyridin-3-yl ester (CA 110861-18-2, Synthesis, 1990, 499) (4.88 g, 23.6 mmol) in anhydrous DMF (45 ml) was added after degasing with argon Zn-dust (70 mg, 1.07 mmol), Zn(CN)2 (1.28 g, 10.9 mmol) and DPPF PdCl2 (966 mg, 1.18 mmol) and the reaction mixture was heated for 6 h at 130° C. and 18 h at 150° C. The reaction mixture was diluted with TBME and H2O, filtered over Celite, and the product was extracted with TBME. Combined extracts were washed with water and brine, dried over MgSO4, filtered and concentrated. The title compound was obtained as a beige solid after crystallization from EtOAc-hexane: TLC (CH2Cl2-MeOH 19:1): Rf=0.22;
HPLC RtH5=0.677 min; ESIMS: 153 and 155 [(M−H)−];
1H NMR (360 MHz, CD3OD): 8.19 (d, 1H), 7.41 (d, 1H).
b) 3-Chloro-5-fluoromethoxy-pyridine-2-carbonitrile
To a solution of 3-chloro-5-hydroxy-pyridine-2-carbonitrile (315 mg, 2.03 mmol) in DMF (16 ml) was added Cs2CO3 (1.652 g, 5.07 mmol) and toluene-4-sulfonic acid fluoromethyl ester (CAS registry 114435-86-8) (621 mg, 3.04 mmol) and the reaction mixture was heated at 80° C. for 24 h. The solvent was removed under reduced pressure and the residue taken up in TBME, washed with water and brine, dried over MgSO4, filtered and concentrated. The title compound was obtained as a yellow oil after chromatography on silica gel (hexane-EtOAc 10:1 to 2:1) to provide the title compound as a light yellow oil: TLC (hexane-EtOAc 1:1): Rf=0.62;
HPLC RtH5=0.872 min; ESIMS: 185 and 187 [(M−H)−];
1H NMR (360 MHz, CDCl3): 8.35 (s, 1H), 7.47 (s, 1H), 5.72 (d, 2H).
c) 3-Chloro-5-fluoromethoxy-pyridine-2-carboxylic acid
To a solution of 3-chloro-5-fluoromethoxy-pyridine-2-carbonitrile (76 mg, 0.4 mmol) in dioxane (3 ml) was added 1N NaOH (1.4 ml) and the reaction mixture was heated for 30 h at 70° C. The reaction mixture was acidified with 4N HCl to pH 3 and evaporated to dryness. The residue was suspended in CH2Cl2-MeOH 8:1, filtered over Celite and concentrated to provide the title compound as a yellow oil.
HPLC RtH5=0.549 min; ESIMS: 204 and 206 [(M−H)−];
1H NMR (360 MHz, CD3OD): 8.39 (s, 1H), 7.76 (s, 1H), 5.90 (d, 2H).
Acid-15: 3-Chloro-5-difluoromethoxy-pyridine-2-carboxylic acid
a) 3-Chloro-5-difluoromethoxy-pyridine-2-carbonitrile
To a solution of 3-chloro-5-hydroxy-pyridine-2-carbonitrile (314 mg, 2.03 mmol) in DMF (10 ml) was added K2CO3 (841 mg, 6.09 mmol) and sodium chlorodifluoroacetate (1.29 g, 8.11 mmol) and the reaction mixture was heated at 100° C. for 10 min. The reaction mixture was diluted with H2O and extracted with TBME. Combined extracts were washed with brine, dried over MgSO4, filtered and concentrated. The title compound was obtained as a yellow oil after chromatography on silica gel (hexane-EtOAc 20:1 to 1:1) to provide the title compound as a light yellow oil: TLC (hexane-EtOAc 2:1): Rf=0.54;
HPLC RtH5=0.968 min; ESIMS: 203 and 205 [(M−H)−];
1H NMR (360 MHz, CDCl3): 8.41 (d, 1H), 7.59 (d, 1H), 6.61 (t, 1H).
b) 3-Chloro-5-difluoromethoxy-pyridine-2-carboxylic acid
To a solution of 3-chloro-5-hydroxy-pyridine-2-carbonitrile (90 mg, 0.44 mmol) in dioxane (2 ml) was added 1N NaOH (1.5 ml) and the reaction mixture was heated for 14 h at 70° C. The reaction mixture was extracted with EtOAc, the aqueous layer acidified to pH 3 with 4N HCl and evaporated to dryness. The residue was suspended in CH2Cl2-MeOH 10:1, filtered over Celite and concentrated to provide the title compound as beige solid.
HPLC RtH5=0.667 min; ESIMS: 222 and 224 [(M−H)−];
1H NMR (360 MHz, CD3OD): 8.46 (s, 1H), 7.87 (s, 1H), 7.12 (t, 1H).
Acid-16: 3-Chloro-5-methoxymethyl-pyridine-2-carboxylic acid
a) 3-Chloro-5-methoxymethyl-pyridine-2-carbonitrile
To a solution of 2,3-dichloro-5-methoxymethyl-pyridine (CA registry 202395-72-0) (7.5 g, 38 mmol) in DMF (100 ml) was added after degasing with argon Zn-dust (126 mg, 1.91 mmol), Zn(CN)2 (2.27 g, 19.1 mmol) and DPPF PdCl2 (0.997 g, 1.15 mmol) and the reaction mixture was heated for 2 h at 145° C. The reaction mixture was concentrated, the residue redissolved in TBME and 5% aqueous NaHCO3 solution and extracted with TBME. Combined extracts were washed with water and brine, dried over MgSO4, filtered and concentrated. The title compound was obtained after chromatography on silica gel (hexane-EtOAc 20:1 to EtOAc) as beige crystals: TLC (hexane-EtOAc 1:1): Rf=0.47;
HPLC RtH5=0.854 min; ESIMS: 183 and 185 [(M+H)+];
1H NMR (360 MHz, CDCl3): 8.46 (s, 1H), 7.80 (s, 1H), 4.49 (s, 2H), 3.41 (s, 3H).
b) 3-Chloro-5-methoxymethyl-pyridine-2-carboxylic acid
To a solution of 3-chloro-5-methoxymethyl-pyridine-2-carbonitrile (2.75 g, 15 mmol) in dioxane (30 ml) was added 2N NaOH (30 ml) and the reaction mixture was heated for 8 h at 75° C. The reaction mixture was acidified to pH 3 with 4N HCl and evaporated to dryness. The residue was suspended in EtOH-THF 1:1, filtered and concentrated. The title compound was obtained after recrystallization from EtOH-TBME as beige crystals.
HPLC RtH5=0.480 min; ESIMS: 169 and 170 [(M-CH3OH)+];
1H NMR (360 MHz, CD3OD): 8.37 (s, 1H), 7.81 (s, 1H), 4.48 (s, 2H), 3.39 (s, 3H).
Example 186
Biological Activity of Compounds of the Formula I
The compounds of the Examples hereinbefore show the following IC50 values in Test 1 described hereinbefore:












TABLE 22







Example
Bace IC50 [μM]
Example
Bace IC50 [μM]





















1
1.3
2
0.14



3
0.070
4
>10



5
0.64
6
4.7



7
0.54
8
>10



9
2.3
10
0.59



11
3.8
12
0.85



13
3.4
14
0.16



15
9.1
16
9.2



17
0.4
18
0.56



19
2.0
20
0.35



21
0.24
22
0.42



23
11
24
0.97



25
>130
26
>130



27
1.4
28
60



29
0.056
30
0.33



31
0.16
32
1.4



33
0.13
34
0.56



35
0.30
36
0.35



37
0.12
38
>10



39
0.78
40
1.0



41
0.35
42
0.056



43
0.062
44
0.019



45
0.016
46
0.071



47
0.056
48
0.55



49
0.050
50
0.42



51
0.23
52
0.18



53
0.38
54
0.44



55
0.084
56
0.101



57
1.7
58
0.78



59
0.24
60
0.058



61
1.97
62
0.095



63
0.11
64
0.040



65
1.2
66
0.020



67
0.10
68
0.011



69
0.009
70
0.034



71
0.016
72
0.010



73
0.026
74
0.079



75
0.13
76
0.046



77
0.092
78
0.038



79
0.12
80
0.074



81
1.1
82
3.0



83
2.9
84
0.93



85
0.026
86
0.044



87
0.057
88
0.033



89
0.094
90
0.039



91
0.015
92
0.005



93
0.008
94
0.022



95
0.39
96
0.027



97
0.018
98
0.24



99
0.14
100
0.034



101
0.030
102
0.89



103
7.8
104
1.5



105
5.2
106
4.0



107
0.82
108
0.028



109
1.2
110
1.9



111
0.025
112
0.042



113
0.12
114
0.006



115
0.006
116
0.018



117
0.018
118
0.014



119
0.010
120
0.18



121
0.036
122
0.20



123
0.097
124
0.025



125
0.078
126
0.74



127
0.098
128
0.17



129
2.2
130
0.093



131
0.33
132
0.087



133
1.0
134
0.26



135
0.045
136
0.13



137
0.030
138
0.042



139
0.075
140
0.043



141
0.033
142
0.82



143
0.11
144
0.017



145
0.34
146
0.10



147
0.079
148
0.94



149
0.70
150
0.29



151
1.2
152




153
0.008
154
0.12



155
0.18
156
0.034



157
5.2
158
0.018



159
0.13
160
0.012



161
0.066
162
8.5



163
0.68
164
0.001



165
0.008
166
1.2



167
0.003
168
0.26



169
0.012
170
0.34



171
0.049
172
0.009



173
>10
174
0.21



175
0.016
176
0.018



177
0.029
178
0.17



179
0.92
180
0.34



181
0.34
182
0.004



183
0.70
184
0.059



185
0.05










Certain compounds of the Examples hereinbefore show the following IC50 values in Test 4 described hereinbefore:










TABLE 23







Example
Bace IC50 [μM]



















1
1.7



3
0.017



4
5.8



16
3.1



38
1.1



54
0.061



64
0.004



71
0.004



72
0.003



99
0.10



104
0.15



112
0.007



116
0.004



129
1.2



144
0.006



147
0.008



164
0.001



175
0.004










FIGURE DESCRIPTIONS
FIG. 1 shows the X-ray powder diffraction pattern for a crystalline form of 5-cyano-pyridine-2-carboxylic acid [3-((R)-5-amino-3-difluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide when measured using CuKα radiation. For details see Example 152.
FIG. 2 shows the X-ray powder diffraction pattern for crystalline 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]amide when measured using CuKα radiation. For details see Example 72b.

## Claims

1. A compound 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-(5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide of the following formula



or a pharmaceutically acceptable salt thereof.

2. The compound of claim 1 in free form.

3. The compound of claim 1 in hydrochloride salt form.

4. A pharmaceutical composition comprising a compound of claim 1, or a pharmaceutically acceptable salt thereof, as active ingredient and a pharmaceutical carrier or diluent.

5. A compound 5-cyano-3-methyl-pyridine-2-carboxylic acid [3-((3R,6R)-5-amino-3,6-dimethyl-6-trifluoromethyl-3,6-dihydro-2H-[1,4]oxazin-3-yl)-4-fluoro-phenyl]-amide of the following formula



or a pharmaceutically acceptable salt thereof.

6. The compound of claim 5 in free form.

7. The compound of claim 5 in hydrochloride salt form.

8. A pharmaceutical composition comprising a compound of claim 5, or a pharmaceutically acceptable salt thereof, as active ingredient and a pharmaceutical carrier or diluent.