# Patent

## Title
Treprostinil derivative compounds and methods of using same

## Abstract

Compounds represented by formulae I, II, III, and IV including pro-drugs for treprostinil and prostacyclin analogs. Uses include treatment of pulmonary hypertension (PH) or pulmonary arterial hypertension (PAH). The structures of the compounds can be adapted to the particular application for a suitable dosage. Transdermal applications can be used.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part application of U.S. application Ser. No. 14/153,498 filed on Jan. 13, 2014, which claims priority to U.S. Provisional Application No. 61/751,608 filed on Jan. 11, 2013, each of which is incorporated herein by reference in its entirety for all purposes.


BACKGROUND
Pulmonary hypertension (PH) or pulmonary arterial hypertension (PAH) is a disease which can result in death and is characterized by increased pulmonary artery pressure and pulmonary vascular resistance. A need exists for better compounds and methods for treating PH and PAH. See, for example, US Patent Publication No. 2013/0274261. Many valuable pharmacologically active compounds, including some of interest with respect to PH and PAH, cannot be effectively administered orally for various reasons and are generally administered via intravenous or intramuscular routes. These routes of administration generally require intervention by a physician or other health care professional, and can entail considerable discomfort as well as potential local trauma to the patient. One example of such a compound is treprostinil and derivatives thereof, which has been used in the treatment of PH and PAH. See, for example, WO 2005/007081. Treprostinil (herein also called Compound A) has the following structure:




Treprostinil can exist as a salt, such as a sodium salt.

Accordingly, there is a clinical need in providing treprostinil by improved formulations and methods, e.g., either orally or transdermally. More particularly, there is a need for a safe and effective method for increasing the systemic availability of treprostinil via administration of treprostinil or derivatives (including prodrugs) or analogs thereof.
The application of transdermal drug delivery technology to the administration of a wide variety of drugs has been proposed and various systems for accomplishing this are disclosed in numerous technical journals and patents. U.S. Pat. Nos. 3,598,122; 4,144,317; 4,201,211; 4,262,003; and 4,379,454, all of which are incorporated herein by reference, are representative of various transdermal drug delivery systems of the prior art, which systems have the ability of delivering controlled amounts of drugs to patients for extended periods of time ranging in duration from several hours to several days. None of the above patents describes a transdermal delivery system which is intended to deliver treprostinil or its derivatives.
SUMMARY
Embodiments described herein include compounds, compositions, and devices, as well as methods of making and methods of using the same.
One embodiment provides a compound represented by Formula (I)




    wherein, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently H or deuterium;
    Z is —OH, —OR11, —N(R11)R12, —SR11, or P1;
    R11 is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, haloalkyl, heteroalkyl, substituted heteroalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, alkylcycloalkyl, substituted alkylcycloalkyl, alkylcycloheteroalkyl, substituted alkylcycloheteroalkyl, aryl, substituted aryl, alkylaryl, substituted alkylaryl, heteroaryl, substituted heteroaryl, alkylheteroaryl, or substituted alkylheteroaryl;
    R12 is H, haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    P1 is selected from the group consisting of:






wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl, and methoxy;
    R18 and R19 are independently in each occurrence selected from the group consisting of hydrogen and alkyl, wherein the alkyl is unsubstituted or substituted with I substituent selected from the group consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl, and heteroaryl, wherein the aryl or heteroaryl are unsubstituted or substituted from the group consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    and, R1 and R2 are independently H or P2, wherein at least one of R1 and R2 is P2, wherein
    P2 is selected from the group consisting of:









wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are as defined above;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl and methoxy;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring;
    R18 and R19 are as defined above;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula I includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula 1.


In another embodiment, the parameters of Formula I are defined as follows:

    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently H or deuterium;
    Z is —OR11, —N(R11)R12, —SR11, or P1;
    R11 is branched alkyl, haloalkyl, halocycloalkyl, heteroalkyl, substituted heteroalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, bicycloalkyl, alkylcycloalkyl, substituted alkylcycloalkyl, alkylcycloheteroalkyl, substituted alkylcycloheteroalkyl, alkylaryl, substituted alkylaryl, heteroaryl, substituted heteroaryl, alkylheteroaryl, or substituted alkylheteroaryl;
    R12 is H, branched alkyl, haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    P1 is selected from the group consisting of:






wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl, and methoxy;
    R18 and R19 are independently in each occurrence selected from the group consisting of hydrogen and alkyl, wherein the alkyl is unsubstituted or substituted with 1 substituent selected from the group consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl, and heteroaryl, wherein the aryl or heteroaryl are unsubstituted or substituted from the group consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    and, R1 and R2 are independently H or P2, wherein
    P2 is selected from the group consisting of:









wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are as defined above;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl and methoxy;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring;
    R18 and R19 are as defined above;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula I includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula I.


In another embodiment, provided is a compound represented by Formula II:




wherein,

    R2 is selected from the group consisting of H and P2;
    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently selected from the group consisting of H and deuterium;
    L1 is selected from the group consisting of —O-alkylene-C(O)—, —O-alkylene-OC(O)—, or a bond;

wherein

    P2 is selected from the group consisting of:









wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are as defined above;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl and methoxy;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring;
    R18 and R19 are as defined above;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula II includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula II.


In another embodiment, a compound is represented by Formula III:




wherein L2 is selected from the group consisting of —CH2—, —CHMe-, —C(Me)2- and the following:





wherein,

    m is 1, 2, 3, or 4;
    X is NR14 or O;
    R14 is selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring; and
    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently selected from the group consisting of H and deuterium;
    wherein Z is —OH, —OR11, —N(R11)R12, —SR11, or P1;
    R11 is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, haloalkyl, heteroalkyl, substituted heteroalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, alkylcycloalkyl, substituted alkylcycloalkyl, alkylcycloheteroalkyl, substituted alkylcycloheteroalkyl, aryl, substituted aryl, alkylaryl, substituted alkylaryl, heteroaryl, substituted heteroaryl, alkylheteroaryl, or substituted alkylheteroaryl;
    R12 is H, haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    P1 is selected from the group consisting of:






wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl, and methoxy;
    R18 and R19 are independently in each occurrence selected from the group consisting of hydrogen and alkyl, wherein the alkyl is unsubstituted or substituted with 1 substituent selected from the group consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl, and heteroaryl, wherein the aryl or heteroaryl is unsubstituted or substituted from the group consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula III includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula III.


Another embodiment provides a compound represented by Formula IV:




wherein,

    R1 is selected from the group consisting of H and P2;
    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently selected from the group consisting of H and deuterium;
    L1 is selected from the group consisting of —O-alkylene-C(O)—, —O-alkylene-OC(O)—, or a bond;

wherein

    P2 is selected from the group consisting of:









wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl, and methoxy;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring;
    R18 and R19 are independently in each occurrence selected from the group consisting of hydrogen and alkyl, wherein the alkyl is unsubstituted or substituted with 1 substituent selected from the group consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl, and heteroaryl, wherein the aryl or heteroaryl is unsubstituted or substituted from the group consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula IV includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula IV.


Compositions are also provided including compositions comprising at least one compound according to Formula I, II, III or IV and at least one other component. In one embodiment, the composition is formulated for transdermal delivery. In another embodiment, the composition is formulated for transdermal delivery with a patch. In one embodiment, the composition can further comprise at least one solvent. In one embodiment, the amount of the compound according to Formula I, II, III or IV is adapted to provide a useful delivery profile for treatment of a human. In one embodiment, the treatment is carried out on a subject, such as a mammal, but the subject is not a human.
At least one advantage for at least one embodiment includes ability to tailor the chemical structure of a pharmaceutically useful motif for particular uses including treatment and prophylactic use against, for example, PH and PAH. For example, the drug delivery profile can be adapted for a particular application.
At least one additional advantage for at least one embodiment includes ability to use the compounds to provide better bioavailability including use in transdermal drug delivery applications.


DETAILED DESCRIPTION
Introduction
Priority U.S. provisional application 61/751,608 filed Jan. 11, 2013 is incorporated herein by reference in its entirety for all purposes including the chemical formulae and claims, including Formula I, Formula II, and Formula III, as well as Schemes 1-4, examples, and the tables of structures on pages 14-16.
Various prostacyclin analogs, including treprostinil, and methods for their use are known. For example, they can be used in promoting vasodilation, inhibiting platelet aggregation and thrombus formation, stimulating thrombolysis, inhibiting cell proliferation (including vascular remodeling), providing cytoprotection, and preventing atherogenesis and inducing angiogenesis. Through these prostacyclin-mimetic mechanisms, these compounds may be used in the treatment of/for: pulmonary hypertension, ischemic diseases (e.g., peripheral vascular disease, Raynaud's phenomenon, scleroderma, myocardial ischemia, ischemic stroke, renal insufficiency), heart failure (including congestive heart failure), conditions requiring anticoagulation (e.g., post MI, post cardiac surgery), thrombotic microangiopathy, extracorporeal circulation, central retinal vein occlusion, atherosclerosis, inflammatory diseases (e.g., COPD, psoriasis), hypertension (e.g., preeclampsia), reproduction and parturition, cancer or other conditions of unregulated cell growth, cell/tissue preservation, and other emerging therapeutic areas where prostacyclin treatment appears to have a beneficial role. These compounds may also demonstrate additive or synergistic benefit in combination with other cardiovascular agents (e.g., calcium channel blockers, phosphodiesterase inhibitors, endothelial antagonists, and antiplatelet agents).
Treprostinil is a chemically stable analog of prostacyclin. Although treprostinil sodium (Remodulin®) is approved by the Food and Drug Administration (FDA) for subcutaneous administration, treprostinil as the free acid has an absolute oral bioavailability of less than 10% and a very short systemic half life due to significant metabolism.
Definitions
Herein, listings of chemical groups represented by multiple chemical formulae are provided (e.g., P1, P2, L1, and L2). As used herein, these group listings also describe any combination of subgroups of the chemical formulae in the group listing as well as any single formula in the group listing.
The term “alkyl” refers to a monovalent saturated hydrocarbon group. C1-C8 alkyl is an alkyl having from 1 to 8 carbon atoms and includes, for example. C1-C3 alkyl, C1-C5 alkyl, and C1-C7 alkyl. An alkyl may be linear or branched. Examples of alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, isopentyl, neopentyl and n-hexyl.
The term “haloalkyl” refers to a monovalent saturated hydrocarbon group attached to a one or more halogen atoms selected from Cl and F. Specific examples include 2-fluoroethyl, 2,2-difluoroethyl, 2-fluoropropyl, and 2,2-difluoropropyl.
The term “heteroalkyl” refers to a monovalent saturated hydrocarbon group attached to one or more heteroatoms selected from O, N, and S. C1-C8 heteroalkyl is an alkyl having from 1 to 8 carbon atoms and one or more heteroatoms selected from O, N and S, and includes, for example, C1-C3—OH, C1-C5—SH, and C1-C7—NH2. It also includes C1-C2-O—C3-C4-OH. and C1-C2-NH—C3-C4-OH.
The term “cycloalkyl” refers to a monocyclic, bicyclic, or tricyclic monovalent saturated hydrocarbon ring system. The term “C3-C14 cycloalkyl” refers to a cycloalkyl wherein the number of ring carbon atoms is from 3 to 14. Examples of C3-C14 cycloalkyl include C3-C10 cycloalkyl and C1-C6 cycloalkyl. Bicyclic and tricyclic ring systems include fused, bridged and spirocyclic ring systems. More particular examples of cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cis- and trans-decalynil, norbornyl, adamantyl, and spiro[4.5]decanyl.
The term “cycloheteroalkyl” or “heterocycloalkyl” refers to a monocyclic, bicyclic, or tricyclic monovalent saturated ring system wherein from 1 to 4 ring atoms are heteroatoms independently selected from the group consisting of O, N and S. The term “3- to 14-membered cycloheteroalkyl” refers to a cycloheteroalkyl wherein the number of ring atoms is from 3 to 14. Examples of 3- to 14-membered cycloheteroalkyl include 3- to 10-membered cycloheteroalkyl and 3- to 6-membered cycloheteroalkyl. Bicyclic and tricyclic ring systems include fused, bridged and spirocyclic ring systems. More particular examples of cycloheteroalkyl groups include azepanyl, azetidinyl, aziridinyl, imidazolidinyl, morpholinyl, oxazolidinyl, piperazinyl, piperidinyl, pyrazolidinyl, pyrrolidinyl, quinuclidinyl, tetrahydrofuranyl, thiomorpholinyl, and alpha-methyl-1,3-dioxol-2-onyl.
The term “alkylcycloalkyl” refers to a monocyclic, bicyclic, or tricyclic monovalent saturated hydrocarbon ring system linked to an alkyl group. Particular examples include cyclopropylmethyl, cyclopropylethyl, and cyclohexylethyl.
The term “alkylheterocycloalkyl” or “alkylcycloheteroalkyl” refers to a cycloheteroalkyl group attached to an alkyl group. Specific examples include N-ethylmorpholine. N-ethylpiperidine, 4-ethylpiperidine, 1-methyl-4-ethylpiperidine, and N-ethylpiperazine.
The term “aryl” refers to a monovalent aromatic carbocyclic ring system, which may be a monocyclic, fused bicyclic, or fused tricyclic ring system. The term “C6-C14 aryl” refers to an aryl having from 6 to 14 ring carbon atoms. An example of C6-C14 aryl is C6-C10 aryl. More particular examples of aryl groups include phenyl, naphthyl, anthracyl, and phenanthryl.
The term “heteroaryl” refers to an unsaturated aromatic heterocyclyl radical. Examples of heteroaryl radicals include unsaturated 3- to 6-membered heteromonocyclic groups containing 1 to 4 nitrogen atoms, for example, pyrrolyl, pyrrolinyl, imidazolyl, tetrazolyl, etc.; unsaturated condensed heterocyclyl groups containing 1 to 5 nitrogen atoms, for example, indolyl, isoindolyl, benzimidazolyl, quinolyl, benzotrazolyl. tetrazolopyridazinyl, etc.; unsaturated 3- to 6-membered heteromonocyclic groups containing 1 to 2 oxygen atoms and 1 to 3 nitrogen atoms, for example, oxazolyl, oxadiazolyl, etc.; unsaturated condensed heterocyclyl groups containing 1 to 2 oxygen atoms and 1 to 3 nitrogen atoms; unsaturated 3- to 6-membered heteromonocyclic groups containing 1 to 2 sulfur atoms and 1 to 3 nitrogen atoms, for example, thiazolyl, thiadiazolyl, etc.; and unsaturated condensed heterocyclyl groups containing 1 to 2 sulfur atoms and 1 to 3 nitrogen atoms.
The term “alkylaryl” refers to an aryl-substituted alkyl radical such as benzyl, diphenylmethyl or phenylethyl.
The term “alkylheteroaryl” refers to a heteroaryl-substituted alkyl radical such as imidazoylmethyl, thiazoylmethyl or pyridylethyl.
The terms described herein such as alkyl, haloalkyl, heteroalkyl, cycloalkyl, cycloheteroalkyl, alkylcycloalkyl, al kylheterocycloalkyl, aryl, heteroaryl, alkylaryl, and alkylheteroary. are understood to cover optionally embodiments wherein they form rings. For example, optionally groups such as R14, R15, R16, R17, R18, and R19 can form rings with other R14, R15, R16, R17, R18, and R19 groups.
The term “substituted” refers to the replacement of one or more hydrogen radicals in a given structure with the radical of a specified substituent including, but not limited to: halo, alkyl, alkenyl, alkynyl, aryl, heterocyclyl, thiol, alkylthio, arylthio, alkylthioalkyl, alkylsulfonyl, alkylsulfonylalkyl, alkoxy, alkoxy, aryloxy, aminocarbonyl, alkylaminocarbonyl, arylaminocarbonyl, alkoxycarbonyl, aryloxycarbonyl, alkylhalo, amino, trifluoromethyl, cyano, nitro, alkylamino, arylamino, alkylaminoalkyl, arylaminoalkyl, hydroxyl, alkyloxyalkyl, carboxyalkyl, alkoxycarbonylalkyl, aminocarbonylalkyl, acyl, carbonyl, carboxylic acid, sulfonic acid, phosphonic acid, aryl, heteroaryl, heterocyclic, and aliphatic. It is understood that the substituent may be further substituted within the normal limits of the skilled artisan. A moiety or group may be optionally substituted which means the group may or may not have one or more substituents.
The term “compound” as used herein is also intended to include salts, solvates, hydrates and polymorphs thereof. The specific recitation of “salt”, “solvate”, “hydrate” or “polymorph” in certain aspects of the invention described in this application shall not be interpreted as an intended omission of these forms in other aspects of the invention where the term “compound” is used without recitation of these other forms.
A salt of a compound of this invention is formed between an acid and a basic group of the compound, such as an amino functional group, or a base and an acidic group of the compound, such as a carboxyl functional group. According to another preferred embodiment, the compound is a pharmaceutically acceptable base addition salt or acid addition salt.
The term “pharmaceutically acceptable” refers to a component that is, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and other mammals without undue toxicity, irritation, allergic response and the like, and are commensurate with a reasonable benefit/risk ratio. A “pharmaceutically acceptable salt” means any non-toxic salt that, upon administration to a recipient, is capable of providing, either directly or indirectly, a compound or a prodrug of a compound of this invention. A “pharmaceutically acceptable counterion” is an ionic portion of a salt that is not toxic when released from the salt upon administration to a recipient.
Acids commonly employed to form pharmaceutically acceptable salts include inorganic acids such as hydrogen bisulfide and hydrochloric, hydrobromic, hydroiodic, sulfuric and phosphoric acids, as well as organic acids such as para-toluenesulfonic, salicylic, tartaric, bitartaric, ascorbic, maleic, besylic, fumaric, gluconic, glucuronic, formic, glutamic, methanesulfonic, ethanesulfonic, benzenesulfonic, lactic, oxalic, para-bromophenylsulfonic, carbonic, succinic, citric, benzoic and acetic acids, and related inorganic and organic acids. Pharmaceutically acceptable salts thus include sulfate, pyrosulfate, bisulfate, sulfite, bisulfate, phosphate, monohydrogenphosphate, dihydrogenphosphate, metaphosphate, pyrophosphate, chloride, bromide, iodide, acetate, propionate, decanoate, caprylate, acrylate, formate, isobutyrate, caprate, heptanoate, propiolate, oxalate, malonate, succinate, suberate, sebacate, fumarate, maleate, butyne-1,4-dioate, hexyne-1,6-dioate, benzoate, chlorobenzoate, methylbenzoate, dinitrobenzoate, hydroxybenzoate, methoxybenzoate, phthalate, terephthalate, sulfonate, xylenesulfonate, phenylacetate, phenylpropionate, phenylbutyrate, citrate, lactate, .beta.-hydroxybutyrate, glycolate, maleate, tartrate, methanesulfonate, propanesulfonate, naphthalene-1-sulfonate, naphthalene-2-sulfonate, mandelate and the like salts. Preferred pharmaceutically acceptable acid addition salts include those formed with mineral acids such as hydrochloric acid and hydrobromic acid, and especially those formed with organic acids such as maleic acid.
As used herein, the term “hydrate” means a compound which further includes a stoichiometric or non-stoichiometric amount of water bound by non-covalent intermolecular forces.
As used herein, the term “solvate” means a compound which further includes a stoichiometric or non-stoichiometric amount of a solvent such as water, acetone, ethanol, methanol, dichloromethane, 2-propanol, or the like, bound by non-covalent intermolecular forces.
Isotopes and Isotopic Abundance
It will be recognized that some variation of natural isotopic abundance occurs in a synthesized compound depending upon the origin of chemical materials used in the synthesis. Thus, a preparation of treprostinil will inherently contain small amounts of deuterated isotopologues. The concentration of naturally abundant stable hydrogen and carbon isotopes, notwithstanding this variation, is small and immaterial with respect to the degree of stable isotopic substitution of compounds of this invention. See, for instance, Wada E et al, Seikagaku 1994, 66:15; Ganes L Z et al, Comp Biochem Physiol Mol Integr Physiol 1998, 119:725. In a compound of this invention, when a particular position is designated as having deuterium, it is understood that the abundance of deuterium at that position is substantially greater than the natural abundance of deuterium, which is about 0.015%. A position designated as having deuterium typically has a minimum isotopic enrichment factor of at least about 3000 (about 45% deuterium incorporation) at each atom designated as deuterium in said compound.
The term “isotopic enrichment factor” as used herein means the ratio between the isotopic abundance and the natural abundance of a specified isotope.
In some embodiments, a compound of this invention has an isotopic enrichment factor for each designated deuterium atom of at least 3500 (52.5% deuterium incorporation at each designated deuterium atom), at least 4000 (60% deuterium incorporation), at least 4500 (67.5% deuterium incorporation), at least 5000 (75% deuterium incorporation), at least 5500 (82.5% deuterium incorporation), at least 6000 (90% deuterium incorporation), at least 6333.3 (95% deuterium incorporation), at least 6466.7 (97% deuterium incorporation), at least 6600 (99% deuterium incorporation), or at least 6633.3 (99.5% deuterium incorporation).
In the compounds of this invention any atom not specifically designated as a particular isotope is meant to represent any stable isotope of that atom. Unless otherwise stated, when a position is designated specifically as “H” or “hydrogen”, the position is understood to have hydrogen at its natural abundance isotopic composition.
In other embodiment, a compound of the invention contains less than 10%, preferably less than 6%, and more preferably less than 3% of all other isotopologues combined, including a form that lacks any deuterium. In certain aspects, the compound contains less than “X”% of all other isotopologues combined, including a form that lacks any deuterium; where X is any number between 0 and 10 (e.g., 1, 0.5, 0.001), inclusive. Compositions of matter that contain greater than 10% of all other isotopologues combined are referred to herein as “mixtures” and must meet the parameters set forth below. These limits of isotopic composition and all references to isotopic composition herein, refer solely to the relative amounts of deuterium/hydrogen present in the active, free base form of the compound of Formula I or II, and do not include the isotopic composition of hydrolysable portions of prodrugs, or of counterions.
The term “isotopologue” refers to species that differ from a specific compound of this invention only in the isotopic composition of their molecules or ions.
Stereoisomers
It is understood that the present invention encompasses all possible stereoisomers, including all possible diastereomers and enantiomers, of the compounds described herein, and not only the specific stereoisomers as indicated by drawn structure or nomenclature. Some embodiments of the invention relate to the specific stereoisomers indicated by drawn structure or nomenclature.
Core Structure Formula I
In one embodiment, the invention provides a compound represented by Formula I:




At least two sub-embodiments are provided to define further Formula I.
In a first sub-embodiment of Formula I, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently H or deuterium;

    Z is —OH, —OR11, —N(R11)R12, —SR11, or P1;
    R11 is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, haloalkyl, heteroalkyl, substituted heteroalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, alkylcycloalkyl, substituted alkylcycloalkyl, alkylcycloheteroalkyl, substituted alkylcycloheteroalkyl, aryl, substituted aryl, alkylaryl, substituted alkylaryl, heteroaryl, substituted heteroaryl, alkylheteroaryl, or substituted alkylheteroaryl;
    R12 is H, haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    P1 is selected from the group consisting of:






wherein,

    m is 1,2,3, or4;
    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl, and methoxy;
    R18 and R19 are independently in each occurrence selected from the group consisting of hydrogen and alkyl, wherein the alkyl is unsubstituted or substituted with 1 substituent selected from the group consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl, and heteroaryl, wherein the aryl or heteroaryl are unsubstituted or substituted from the group consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    and, R1 and R., are independently H or P2, wherein at least one of R1 and R2 is P2, wherein
    P2 is selected from the group consisting of:









wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are as defined above;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the list consisting of halo, methyl and methoxy;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring;
    R18 and R19 are as defined above;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula I includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula I. In this Formula I, the Z, R1, and R2 groups are not linked to each other, in contrast to Formulae II, III, and IV described herein.


In one embodiment, R1 is P2 and R2 is H. In another embodiment, R1 is H and R2 is P2. In another embodiment, R1 is P2 and R2 is P2.
The group P2 can be more particularly described. In one embodiment, P2 is selected from the group consisting of:







In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In another embodiment, P2 is selected from the group consisting of:




In one embodiment, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are H.
In one embodiment, Z is —OR11, —N(R11)R12, or P1. In another embodiment, Z is P1. In another embodiment, Z is —OH, —OR11, —N(R11)R12, or P1. In another embodiment, Z is —OH.
In one embodiment, Z is not —OH and R11 is not unsubstituted or substituted benzyl.
In a second sub-embodiment of Formula I,

    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently H or deuterium;
    Z is —OR11, —N(R11)R12, —SR11, or P1;
    R11 is branched alkyl, haloalkyl, halocycloalkyl, heteroalkyl, substituted heteroalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, bicycloalkyl, alkylcycloalkyl, substituted alkylcycloalkyl, alkylcycloheteroalkyl, substituted alkylcycloheteroalkyl, alkylaryl, substituted alkylaryl, heteroaryl, substituted heteroaryl, alkylheteroaryl, or substituted alkylheteroaryl;
    R12 is H, branched alkyl, haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    P1 is selected from the group consisting of:






wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl, and methoxy;
    R18 and R19 are independently in each occurrence selected from the group consisting of hydrogen and alkyl, wherein the alkyl is unsubstituted or substituted with 1 substituent selected from the list consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl, and heteroaryl, wherein the aryl or heteroaryl is unsubstituted or substituted from the group consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    and, R1 and R2 are independently H or P2, wherein
    P2 is selected from the group consisting of:









wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are as defined above;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O, or S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the list consisting of halo, methyl and methoxy;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring;
    R18 and R19 are as defined above;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula I includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula I.


In one embodiment, Z is —OR11. In one embodiment, Z is —N(R11)R12. In one embodiment, Z is —SR11. In one embodiment, Z is P1. In one embodiment, Z is OR11 and R11 is bicycloalkyl, alkylcycloalkyl, or alkylcycloheteroalkyl. In one embodiment, Z is P1.
In one embodiment, R11 is haloalkyl, or more particularly, fluoroalkyl.
In one embodiment, R1 is hydrogen or R2 is hydrogen. In one embodiment, R1 is hydrogen and R2 is P2. In one embodiment, R1 is P2 and R2 is hydrogen. In one embodiment, R1 and R2 are hydrogen. In one embodiment, R1 and R2 are P2.
In one embodiment, at least one of R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 is deuterium.
In one embodiment, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are hydrogen.
Formula IA
A sub-embodiment of formula I is a compound represented by Formula (IA):




wherein,

    Z is —OH, —OR11, or P1;
    R11 is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, haloalkyl, heteroalkyl, substituted heteroalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, alkylcycloalkyl, substituted alkylcycloalkyl, alkylcycloheteroalkyl, or substituted alkylcycloheteroalkyl;
    P1 is selected from the group consisting of:






wherein,

    m is 1, 2, 3, or 4;
    R14 is selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    and, R1 and R2 are independently H or P2, wherein at least one of R1 and R2 is P2, wherein
    P2 is selected from the group consisting of:






wherein,

    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula IA includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula IA.

Examples of Compounds of Formula I



The following are specific compounds of Formula I (noting Compound A is treprostinil):




    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid cyclopropylmethyl ester (all possible stereoisomers, including Compound 1)






    N-Cyclopropylmethyl-2-[2-hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetamide (all possible stereoisomers, including Compound 2)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 2-morpholin-4-yl-ethyl ester (all possible stereoisomers, including Compound 3)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 3-fluoro-propyl ester (all possible stereoisomers, including Compound 4)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid tetrahydro-furan-3-yl ester (all possible stereoisomers, including Compound 5)






    2-{2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetoxy}-propionic acid methyl ester (all possible stereoisomers, including Compound 6)






    N-(2-Hydroxy-ethyl)-2-[2-hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetamide (all possible stereoisomers, including Compound 7)






    N-(2-Amino-ethyl)-2-[2-hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetamide (all possible stereoisomers, including Compound 8)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 2-hydroxy-ethyl ester (all possible stereoisomers, including Compound 9)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 2-methoxy-ethyl ester (all possible stereoisomers, including Compound 10)






    2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3 ,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-N-(3-hydroxy-propyl)-acetamide (all possible stereoisomers, including Compound 11)






    {2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetylamino}-acetic acid methyl ester (all possible stereoisomers, including Compound 12)






    ({2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetyl}-methyl-amino)-acetic acid methyl ester (all possible stereoisomers, including Compound 13)






    2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-N-(2,2,2-trifluoro-ethyl)-acetamide (all possible stereoisomers, including Compound 14)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (all possible stereoisomers, including Compound 15)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 2,2-dimethyl-propyl ester (all possible stereoisomers, including Compound 16)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,2-dimethyl-propyl ester (all possible stereoisomers, including Compound 17)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,2,2-trimethyl-propyl ester (all possible stereoisomers, including Compound 18)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid bicyclo[2.2.1]hept-2-yl ester (all possible stereoisomers, including Compound 19)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid isopropyl ester (all possible stereoisomers, including Compound 20)






    2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-N-(2,2,3,3,3-pentafluoro-propyl)-acetamide (all possible stereoisomers, including Compound 21)






    Pentanoic acid 1-(3-hydroxy-octyl)-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-2-yl ester (all possible stereoisomers, including Compound 22)






    3-Methyl-butyric acid 1-(3-hydroxy-octyl)-5-methoxycarbonylmethoxy-2,3 ,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-2-yl ester (all possible stereoisomers, including Compound 23)






    Cyclopropanecarboxylic acid 1-(3-hydroxy-octyl)-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-2-yl ester (all possible stereoisomers, including Compound 24)






    [2-Ethoxycarbonyloxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (all possible stereoisomers, including Compound 25)






    [2-Acetoxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (all possible stereoisomers, including Compound 26)






    Succinic acid ethyl ester 1-(3-hydroxy-octyl)-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-2-yl ester (all possible stereoisomers, including Compound 27)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid tert-butyl ester (all possible stereoisomers, including Compound 28)






    3-{2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetyl}-oxazolidin-2-one (all possible stereoisomers, including Compound 29)






    2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-N-(1H-tetrazol-5-yl)-acetamide (all possible stereoisomers, including Compound 30)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 2,2,2-trifluoro-1,1-dimethyl-ethyl ester (all possible stereoisomers, including Compound 31)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,2,2-trimethyl-propyl ester (all possible stereoisomers, including Compound 32)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,2,2-trimethyl-propyl ester (all possible stereoisomers, including Compound 33)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid bicyclo[2.2.1]hept-2-yl ester (all possible stereoisomers, including Compound 34)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid bicyclo[2.2.1]hept-2-yl ester (all possible stereoisomers, including Compound 35)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid bicyclo[2.2.1]kept-2-yl ester (all possible stereoisomers, including Compound 36)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid bicyclo[2.2.1]hept-2-yl ester (all possible stereoisomers, including Compound 37)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 2-isopropyl-5-methyl-cyclohexyl ester (all possible stereoisomers, including Compound 38)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,7,7-trimethyl-bicyclo[2.2.1]hept-2-yl ester (all possible stereoisomers, including Compound 39)






    [2-(2-Ethoxy-ethoxycarbonyloxy)-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (all possible stereoisomers, including Compound 40)






    [2-(2-Dimethylamino-ethoxycarbonyloxy)-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (all possible stereoisomers, including Compound 41)






    [1-(3-Hydroxy-octyl)-2-(2,2,2-trifluoro-ethoxycarbonyloxy)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (all possible stereoisomers, including Compound 42)






    3-Morpholin-4-yl-propionic acid 1-(3-hydroxy-octyl)-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-2-yl ester (all possible stereoisomers, including Compound 43)






    [1-(3-Hydroxy-octyl)-2-(2-pyrrolidin-1-yl-acetoxy)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (all possible stereoisomers, including Compound 44)






    Cyclopentanecarboxylic acid 1-[2-(2-hydroxy-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-1-yl)-ethyl]-hexyl ester (all possible stereoisomers, including Compound 45)






    1-Methyl-piperidine-2-carboxylic acid 1-[2-(2-hydroxy-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-1-yl)-ethyl]-hexyl ester (all possible stereoisomers, including Compound 46)






    4-Methyl-morpholine-2-carboxylic acid 1-[2-(2-hydroxy-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-1-yl)-ethyl]-hexyl ester (all possible stereoisomers, including Compound 47)






    Cyclopropanecarboxylic acid 1-[2-(2-hydroxy-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-1-yl)-ethyl]-hexyl ester (all possible stereoisomers, including Compound 48)






    2-Methyl-butyric acid 1-[2-(2-hydroxy-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-1-yl)-ethyl]-hexyl ester (all possible stereoisomers, including Compound 49)






    [1-(3-Cyclopentyloxycarbonyloxy-octyl)-2-hydroxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (all possible stereoisomers, including Compound 50)






    {1-[3-(1-Aza-bicyclo[2.2.2]oct-3-yloxycarbonyloxy)-octyl]-2-hydroxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy}-acetic acid methyl ester (all possible stereoisomers, including Compound 51)






    [2-Acetoxy-1-(3-acetoxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1-aza-bicyclo[2.2.2]oct-3-yl ester (all possible stereoisomers, including Compound 52)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1-aza-bicyclo[2.2.2]oct-3-yl ester (all possible stereoisomers, including Compound 53)






    Propionic acid 1-{2-[5-methoxycarbonylmethoxy-2-(5-methyl-2-oxo-[1,3]dioxo1-4-ylmethoxycarbonyloxy)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-1-yl]-ethyl}-hexyl ester (all possible stereoisomers, including Compound 54)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,2-dimethyl-propyl ester (all possible stereoisomers, including Compound 55)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,2-dimethyl-propyl ester (all possible stereoisomers, including Compound 56)









Core Structure Formulae II and IIA

In another embodiment, the invention provides a compound represented by Formula II:




wherein,

    R, is selected from the group consisting of H and P2;
    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently selected from the group consisting of H and deuterium;
    L1 is selected from the group consisting of —O-alkylene-C(O)—, —O-alkylene-OC(O)—, or a bond;

wherein

    P2 is selected from the group consisting of:









wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are as defined above;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O and S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl and methoxy;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring;
    R18 and R19 are as defined above;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula II includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula II.


In one embodiment, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are H. In one embodiment, at least one of R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 is deuterium.
In one embodiment, L1 is selected from the group consisting of —O-alkyl-C(O)— and —O-alkyl-OC(O)—. In one embodiment, L1 is —O-alkylene-C(O)—. In one embodiment, L1 is —O-alkylene-OC(O)—. In one embodiment, the alkylene group is a C1-C5 alkylene group. In one embodiment, the alkylene group is a C1 alkylene group.
In one sub-embodiment of Formula II, provided are compounds represented by Formula IIA:




wherein L1 and R2 are defined as in Formula II.

Examples of Compounds of Formula II

The following represent specific compounds of Formula II:




    Treprostinil 2-hydroxy lactone (all possible stereoisomers, including Compound 57)






    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid carboxymethyl lactone (all possible stereoisomers, including Compound 58)

Core Structure Formula III



In one embodiment, the invention provides a compound represented by Formula III:




wherein L2 is selected from the group consisting of —CH2—, —CHMe-, —C(Me)2- and the following:





wherein,

    m is 1, 2, 3, or 4;
    X is NR14 or O;
    R14 is selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring; and
    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently selected from the group consisting of H and deuterium;
    wherein Z is —OH, —OR11, —N(R11)R12, —SR11, or P1;
    R11 is alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, haloalkyl, heteroalkyl, substituted heteroalkyl, cycloheteroalkyl, substituted cycloheteroalkyl, alkylcycloalkyl, substituted alkylcycloalkyl, alkylcycloheteroalkyl, substituted alkylcycloheteroalkyl, aryl, substituted aryl, alkylaryl, substituted alkylaryl, heteroaryl, substituted heteroaryl, alkylheteroaryl, or substituted alkyl heteroaryl;
    R12 is H, haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    P1 is selected from the group consisting of:






wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O and S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl, and methoxy;
    R18 and R19 are independently in each occurrence selected from the group consisting of hydrogen and alkyl, wherein the alkyl is unsubstituted or substituted with 1 substituent selected from the list consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl, and heteroaryl, wherein the aryl or heteroaryl is unsubstituted or substituted from the list consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R15 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula III includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula III.


In one embodiment, L2 is selected from the group consisting of:




In one embodiment, at least one of R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 is deuterium, or they are all hydrogen.
One particular sub-embodiment of Formula III includes a compound represented by Formula IIIA:




wherein Z and L2 are defined as in Formula III.

Examples of Compounds of Formula III

The following compounds represent specific examples of Formula III compounds:




    [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester 2,3-maleate (all possible stereoisomers, including Compound 59)

Core Structure Formula IV



Another embodiment is a compound represented by Formula IV, wherein unlike in Formula II, the L1 group links to R2 rather than R1:




    wherein R1 is selected from the group consisting of H and P2;
    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 are independently selected from the group consisting of H and deuterium;
    L1 is a selected from the group consisting of —O-alkylene-C(O)—, —O-alkylene-OC(O)—, and a bond; wherein
    P2 is selected from the group consisting of:









wherein,

    m is 1, 2, 3, or 4;
    R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;
    R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O and S, which is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from the group consisting of halo, methyl, and methoxy;
    R16 and R17 are independently in each occurrence H or alkyl;
    R16 and R17 taken together with the atoms to which they attach optionally form a 3- to 6-membered ring;
    R18 and R19 are independently in each occurrence selected from the group consisting of hydrogen and alkyl, wherein the alkyl is unsubstituted or substituted with 1 substituent selected from the list consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl, and heteroaryl, wherein the aryl or heteroaryl is unsubstituted or substituted from the list consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
    R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
    wherein Formula IV includes enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula IV.


In one embodiment, at least one of R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, and R36 is deuterium, or they are all hydrogen.
In a particular embodiment of Formula IV, a compound is represented by Formula IVA:




wherein L1 and R1 are defined as in Formula IV.

Similar approaches can be used to make and use Formula IV compounds as for Formula II compounds.
Embodiments from Priority Provisional 61/751,608
One embodiment from the priority provisional is a compound according to Formula (IAA).




wherein,

    R100 and R200 are independently selected from the group consisting of H, —CONR900R1000, —CR900R1000OCOP3R900(R1000), wherein R900 and R1000 are independently selected from H, alkyl, and cycloalkyl;
    R300, R400, R500, R600, R700 and R800 are independently selected from the group consisting of H and deuterium;
    X is O, —NHR1200, or S;
    P3 is N or O;
    R1100 is haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    R1200 is haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, heteroaryl.


In one embodiment, R100 and R200 are H. In one embodiment, R300, R400, R500, R600, R700 and R800 are H. In one embodiment, X is O. In one embodiment, R1100 is selected from the group consisting of:




In one embodiment, X is —NHR1200.
In one embodiment, R1100 is chosen from the group consisting of:




In one embodiment, X is O. In one embodiment, R300, R400, R500, R600, R700 and R800 are H. In one embodiment, R1100 is alkyl.
Another embodiment from the priority provisional is a compound of Formula II(AA):




wherein,

    R2000 is independently selected from the group consisting of H, —CONR9000R10000, —CR9000R10000OCOP4R9000(R10000), wherein R9000 and R10000 are independently selected from H, alkyl, and cycloalkyl;
    R3000, R4000, R5000, R6000, R7000 and R8000 are independently selected from the group consisting of H and deuterium;
    X is O, —NR12000 or S;
    P4 is N or O;
    R12000 is haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    n is an integer between 1 and 7;
    wherein compounds of Formula II(AA) include enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula II(AA).


Another embodiment from the priority provisional is a compound having Formula III(AA):




wherein,

    R11 is haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    R03, R04, R05, R06, R07 and R08 are independently selected from the group consisting of H and deuterium;
    X is O, —NR012 or S;
    R012 is haloalkyl, heteroalkyl, cycloheteroalkyl, alkylcycloalkyl, alkylcycloheteroalkyl, aryl, or heteroaryl;
    Y is C═O, —CH2—, —CHMe-, or —C(Me)2-;
    and compounds of Formula III(AA) include enantiomers, pharmaceutically acceptable salts, solvates and polymorphs of the compounds of Formula III(AA).

Methods of Making Compounds of Formula I



The compounds of formula I where R1 and R2 are H can be synthesized according to Scheme 1 by starting with the compound of Formula I where Z is OH and R1 is H and R2 is PG which represents a protective group as described in Protective Groups in Organic Synthesis by Greene and Wuts. The carboxylic acid is activated using coupling conditions which involve the use of an activating agent, including but not limited to EDC, DCC, DIC, BOP, HATU, HBTU, CDI, thionyl chloride, or oxalyl chloride. Coupling conditions may also include or not include an additive, including but not limited to DMF, HOSu, HOBT, or HOAT, and may or may not include one or more nucleophilic or non-nucleophilic bases or additives including, but not limited to, DMAP, TEA, DIPEA, N-methylmorpholine, pyridine, and/or imidazole. Coupling conditions also may be run in a suitable solvent or solvent mixture including, but not limited to, DCM, THF, DMF, dioxane, ethyl acetate, and/or acetonitrile. The activated acid can be isolated and purified or can be treated directly with the reagent ZH. Alternately, ZH can be present during the coupling conditions. Representative examples of coupling conditions and definitions of the activating agents, additives and bases can be found in in Handbook of Reagents for Organic Synthesis: Activating Agents and Protecting Groups, John Wiley and Sons. The resulting compound of Formula I where Z is not OH, R1 is H and R2 is PG is deprotected using deprotection conditions suitable to the type of protective group represented by PG to give the compound of Formula I. Examples of suitable deprotection conditions can be found in Protective Groups in Organic Synthesis by Greene and Wuts.




The compound of Formula I where R1=R2 or where R1 is H can be synthesized according to Scheme 2 starting from the compound of Formula I where R1 and R2 are H by employing acylation conditions and the reactive molecule ROH or RY, where Y is a leaving group including, but not limited to, halogen, sulfonyl, phosphoryl, or acyl. In the case where the reactive molecule ROH is used, acylation conditions are similar to coupling conditions as described above. In the case where the reactive molecule RY is used, the acylation conditions may or may not include one or more nucleophilic or non-nucleophilic bases or additives including but not limited to DMAP, TEA, DIPEA, N-methylmorpholine, pyridine, and/or imidazole and may be run in a suitable solvent or solvent mixture including, but not limited to DCM, THF, DMF, dioxane, ethyl acetate, and/or acetonitrile.




The compounds of Formula I where R2 is H can be synthesized according to Scheme 3 starting from the compound of Formula I where R1 is H and R2 is PG as described above, by employing acylation conditions using ROH or RY as described above followed by deprotection conditions as described above.




Methods of Making Compounds of Formula II

The compounds of Formula II can be synthesized according to Scheme 4 starting from the compound of Formula I where Z is OH and R2 is PG as described above, by employing lactonization conditions. Examples of lactonization conditions can be found in Chemical Reviews (2007), 107, 239 and Beilstein Journal of Organic Chemistry (2012), 8, 1344, and include but are not limited to 2,4,6-trichlorobenzoic anhydride, TEA and DMAP; 4-nitrobenzoic anhydride, TEA, and DMAP; 2-chloro-1-methylpyridinium iodide and tributyl amine; 2,2′-dipyridyl disulfide and triphenylphosphine; and all the reactions in the coupling conditions and acylation conditions described above. The lactonization reactions may be run in a suitable solvent or solvent mixture including, but not limited to DCM, THF, DMF, dioxane, ethyl acetate, acetonitrile and/or toluene.




Methods of Making Compounds of Formula III

The compounds of Formula III can be synthesized according to Scheme 5 starting with the compound of Formula I where R1 and R2 are H, by reacting with an activated carbonyl equivalent including but not limited to phosgene, carbonyl diimidazole, or 4-nitrophenyl chloroformate, in the presence or absence of one or more nucleophilic or non-nucleophilic bases or additives including but not limited to DMAP, TEA, DIPEA, N-methylmorpholine, pyridine, and/or imidazole and may be run in a suitable solvent or solvent mixture including but not limited to DCM, THF, DMF, dioxane, ethyl acetate, acetonitrile, and/or toluene.




Pharmaceutical Compositions

The compounds described herein can be used alone or in combination with other components as known in the art. In particular, formulations of multiple ingredients can be prepared that are adapted for use in prophylactic and therapeutic treatments. The composition can be in the form of, for example, a solid, liquid, semi-solid, solution, suspension, or emulsion formulation. Water can be used as a formulation agent. It can be in pure form or combined with one or more excipients.
In one embodiment, the compound is formulated in matrix form, comprising a matrix material in which drug is contained or dispersed. The matrix material further controls release of the drug by controlling dissolution and/or diffusion of the drug from the reservoir, and may enhance stability of the drug molecule while stored in the reservoir. In one embodiment, the drug is formulated with an excipient material that is useful for accelerating release, e.g., a water-swellable material that can aid in pushing the drug out of the reservoir and through any tissue capsule over the reservoir. Examples include hydrogels and osmotic pressure generating agents known in the art. In another embodiment, the drug is formulated with a penetration enhancer(s). The penetration enhancer further controls release of the drug by facilitating transport of the drug across the skin into the local administration site or systemic delivery.
More particularly, the drug can be dispersed in a matrix material, to further control the rate of release of drug. This matrix material can be a “release system,” as described in U.S. Pat. No. 5,797,898, the degradation, dissolution, or diffusion properties of which can provide a method for controlling the release rate of the chemical molecules.
The release system may provide a temporally modulated release profile (e.g., pulsatile release) when time variation in plasma levels is desired or a more continuous or consistent release profile when a constant plasma level as needed to enhance a therapeutic effect, for example. Pulsatile release can be achieved from an individual reservoir, from a plurality of reservoirs, or a combination thereof. For example, where each reservoir provides only a single pulse, multiple pulses (i.e., pulsatile release) are achieved by temporally staggering the single pulse release from each of several reservoirs. Alternatively, multiple pulses can be achieved from a single reservoir by incorporating several layers of a release system and other materials into a single reservoir. Continuous release can be achieved by incorporating a release system that degrades, dissolves, or allows diffusion of molecules through it over an extended period. In addition, continuous release can be approximated by releasing several pulses of molecules in rapid succession (“digital” release). The active release systems described herein can be used alone or on combination with passive release systems, for example, as described in U.S. Pat. No. 5,797,898.
The pharmaceutical agent can be formulated with one or more pharmaceutically acceptable excipients. Representative examples include bulking agents, wetting agents, stabilizers, crystal growth inhibitors, antioxidants, antimicrobials, preservatives, buffering agents (e.g., acids, bases), surfactants, desiccants, dispersants, osmotic agents, binders (e.g., starch, gelatin), disintegrants (e.g., celluloses), glidants (e.g., talc), diluents (e.g., lactose, dicalcium phosphate), color agents, lubricants (e.g., magnesium stearate, hydrogenated vegetable oils) and combinations thereof. In some embodiments, the excipient is a wax or a polymer. In one embodiment, the polymer comprises polyethylene glycol (PEG), e.g., typically one having a molecular weight between about 100 and 10,000 Daltons (e.g., PEG 200, PEG 1450). In another embodiment, the polymer comprises poly lactic acid (PLA), poly glycolic acid (PGA), copolymers thereof (PLGA), or ethyl-vinyl acetate (EVA) polymers. In yet another embodiment, the excipient material comprises a pharmaceutically acceptable oil (e.g., sesame oil).
In one embodiment, the excipient material includes a saturated drug solution. That is, the excipient material comprises a liquid solution formed of the drug dissolved in a solvent for the drug. The solution is saturated so that the solvent does not dissolve the solid matrix form of the drug. The saturated solution acts as a non-solvent excipient material, substantially filling pores and voids in the solid matrix.
In another embodiment, the excipient material comprises a pharmaceutically acceptable perhalohydrocarbon or unsubstituted saturated hydrocarbon. See, for example, U.S. Pat. No. 6,264,990 to Knepp et al, which describes anhydrous, aprotic, hydrophobic, non-polar liquids, such as biocompatible perhalohydrocarbons or unsubstituted saturated hydrocarbons, such as perfluorodecalin, perflurobutylamine, perfluorotripropylamine, perfluoro-N-methyldecahydroquindine, perfluoro-octohydro quinolidine, perfluoro-N-cyclohexylpyrilidine, perfluoro-N,N-dimethylcyclohexyl methylamine, perfluoro-dimethyl-adamantane, perfluorotrimethylbicyclo (3.3.1)nonane, bis(perfluorohexyl)ethene, bis(perfluorobutyl)ethene, perfluoro-1-butyl-2-hexyl ethene, tetradecane, methoxyflurane and mineral oil.
In one embodiment, the pharmaceutically acceptable excipient material comprises dimethyl sulfoxide (DMSO), glycerol, or ethanol.
Mixtures of compounds according to Formulae I, II, III, and IV can be used.
As noted above, a pharmaceutical composition can comprise a treprostinil derivative or a pharmaceutically acceptable salt, solvate, clathrate or polymorph thereof, and one or more pharmaceutically acceptable carriers or excipients. The composition can optionally contain an additional therapeutic agent.
Pharmaceutically acceptable carriers and excipients include pharmaceutically acceptable materials, vehicles and substances. Non-limiting examples of excipients include liquid and solid fillers, diluents, binders, lubricants, glidants, surfactants, dispersing agents, disintegration agents, emulsifying agents, wetting agents, suspending agents, thickeners, solvents, isotonic agents, buffers, pH adjusters, absorption-delaying agents, sweetening agents, flavoring agents, coloring agents, stabilizers, preservatives, antioxidants, antimicrobial agents, antibacterial agents, antifungal agents, adjuvants, encapsulating materials and coating materials. The use of such excipients in pharmaceutical formulations is known in the art. Except insofar as any conventional carrier or excipient is incompatible with the active ingredient, the disclosure encompasses the use of conventional carriers and excipients in formulations containing treprostinil derivatives. See, e.g., Remington: The Science and Practice of Pharmacy, 21st Ed., Lippincott Williams & Wilkins (Philadelphia, Pa. [2005]); Handbook of Pharmaceutical Excipients, 5th Ed., Rowe et al., Eds., The Pharmaceutical Press and the American Pharmaceutical Association (2005); Handbook of Pharmaceutical Additives, 3rd Ed., Ash and Ash, Eds., Gower Publishing Co. (2007); and Pharmaceutical Preformulation and Formulation, Gibson, Ed., CRC Press LLC (Boca Raton, Fla. [2004]).
Proper formulation can depend on various factors, such as the route of administration chosen. Potential routes of administration of pharmaceutical compositions comprising treprostinil derivatives include without limitation oral, parenteral (including intramuscular, subcutaneous, intradermal, intravascular, intravenous, intraarterial, intramedullary and intrathecal), intraperitoneal, and topical (including dermal/epicutaneous, transdermal, mucosal, transmucosal, intranasal [e.g., by nasal spray or drop], intraocular [e.g., by eye drop], pulmonary [e.g., by inhalation], buccal, sublingual, rectal and vaginal).
As an example, formulations of treprostinil derivatives suitable for oral administration can be presented as, e.g., capsules (including push-fit capsules and soft capsules), cachets or tablets; as powders or granules; or as boluses, electuaries or pastes. For example, push-fit capsules can contain a treprostinil derivative in admixture with, e.g., a filler (e.g., lactose), a binder (e.g., a starch) and a lubricant (e.g., talc or magnesium stearate), and optionally a stabilizer. For soft capsules, a treprostinil derivative can be dissolved or suspended in a suitable liquid (e.g., a fatty oil, liquid paraffin or liquid polyethylene glycol), and a stabilizer can be added.
Compositions for oral administration can also be formulated as solutions or suspensions in an aqueous liquid and/or a non-aqueous liquid, or as oil-in-water liquid emulsions or water-in-oil liquid emulsions. Dispersible powder or granules of a treprostinil derivative can be mixed with any suitable combination of an aqueous liquid, an organic solvent and/or an oil and any suitable excipients (e.g., any combination of a dispersing agent, a wetting agent, a suspending agent, an emulsifying agent and/or a preservative) to form a solution, suspension or emulsion.
Treprostinil derivatives can also be formulated for parenteral administration by injection or infusion. Formulations for injection or infusion can be in the form of, e.g., solutions, suspensions or emulsions in oily or aqueous vehicles, and can contain excipients such as suspending agents, dispersing agents and/or stabilizing agents. For example, aqueous or non-aqueous (e.g., oily) sterile injection solutions can contain a treprostinil derivative along with excipients such as an antioxidant, a buffer, a bacteriostat and solutes that render the formulation isotonic with the blood of the subject. Aqueous or non-aqueous sterile suspensions can contain a treprostinil derivative along with excipients such as a suspending agent and a thickening agent, and optionally a stabilizer and an agent that increases the solubility of the treprostinil derivative to allow for the preparation of a more concentrated solution or suspension. As another example, a sterile aqueous solution for injection or infusion (e.g., subcutaneously or intravenously) can contain a treprostinil derivative, sodium chloride, a buffering agent (e.g., sodium citrate), a preservative (e.g., meta-cresol), and optionally a base (e.g., NaOH) and/or an acid (e.g., HCl) to adjust pH.
For a delayed or sustained release of a treprostinil derivative, a composition can be formulated as a depot that can be implanted in or injected into a subject, e.g., intramuscularly or subcutaneously. A depot formulation can be designed to deliver the treprostinil derivative over a longer period of time, e.g., over at least about 1 week, 2 weeks, 3 weeks, 1 month, 1.5 months, 2 months or longer. For example, a treprostinil derivative can be formulated with a polymeric material, a hydrophobic material (e.g., as an emulsion in an oil) and/or an ion-exchange resin, or as a sparingly soluble derivative (e.g., a sparingly soluble salt).
In some embodiments, a topical dosage form of a treprostinil derivative is formulated as a buccal or sublingual tablet or pill. Advantages of a buccal or sublingual tablet or pill include avoidance of first-pass metabolism and circumvention of gastrointestinal absorption. A buccal or sublingual tablet or pill can also be designed to provide faster release of the treprostinil derivative for more rapid uptake of it into systemic circulation. In addition to a therapeutically effective amount of a treprostinil derivative, the buccal or sublingual tablet or pill can contain suitable excipients, including without limitation any combination of fillers and diluents (e.g., mannitol and sorbitol), binding agents (e.g., sodium carbonate), wetting agents (e.g., sodium carbonate), disintegrants (e.g., crospovidone and croscarmellose sodium), lubricants (e.g., silicon dioxide [including colloidal silicon dioxide] and sodium stearyl fumarate), stabilizers (e.g., sodium bicarbonate), flavoring agents (e.g., spearmint flavor), sweetening agents (e.g., sucralose), and coloring agents (e.g., yellow iron oxide).
In addition, treprostinil derivatives can be formulated for intranasal administration. Intranasal administration avoids first-pass metabolism and can introduce a significant concentration of a treprostinil derivative to the central nervous system, which can reduce side-effects. An intranasal formulation can comprise a treprostinil derivative along with excipients such as a solubility enhancer (e.g., propylene glycol), a humectant (e.g., mannitol or sorbitol), a buffer and water, and optionally a preservative (e.g., benzalkonium chloride), a mucoadhesive agent (e.g., hydroxyethylcellulose) and/or a penetration enhancer.
Furthermore, treprostinil derivatives can be formulated for administration by oral inhalation. Advantages of administration by inhalation include selective deposition of the therapeutic agent in the lungs with less systemic side effects. In certain embodiments, a sterile aqueous solution for oral inhalation contains a treprostinil derivative, sodium chloride, a buffering agent (e.g., sodium citrate), optionally a preservative (e.g., meta-cresol), and optionally a base (e.g., NaOH) and/or an acid (e.g., HCl) to adjust pH.
The pharmaceutical compositions can be manufactured in any suitable manner known in the art, e.g., by means of conventional mixing, dissolving, suspending, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping or compressing processes.
The compositions can be presented in unit dosage form as a single dose wherein all active and inactive ingredients are combined in a suitable system, and components do not need to be mixed to form the composition to be administered. The unit dosage form can contain an effective dose, or an appropriate fraction thereof, of a treprostinil derivative. A representative example of a unit dosage form is a tablet, capsule, or pill for oral uptake. For purposes of the content of a pharmaceutical composition, the term “active ingredient” encompasses a prodrug.
Alternatively, the compositions can be presented as a kit, wherein the active ingredient, excipients and carriers (e.g., solvents) are provided in two or more separate containers (e.g., ampules, vials, tubes, bottles or syringes) and need to be combined to form the composition to be administered. The kit can contain instructions for preparing and administering the composition (e.g., a solution to be injected intravenously).
Topical Compositions
Topical formulations for application to the skin or mucosa can be useful for transdermal or transmucosal administration of a therapeutic agent into the blood for systemic distribution. Advantages of topical administration can include avoidance of first-pass metabolism, circumvention of gastrointestinal absorption, delivery of a therapeutic agent with a relatively short biological half-life, more controlled release of the therapeutic agent, administration of a more uniform plasma dosing of the therapeutic agent, and improvement in user compliance.
In general and in addition to the disclosure on topical formulations described elsewhere herein, compositions suitable for topical administration include without limitation liquid or semi-liquid preparations such as sprays, gels, liniments, lotions, oil-in-water or water-in-oil emulsions such as creams, foams, ointments and pastes, and solutions or suspensions such as drops (e.g., eye drops, nose drops and ear drops). In some embodiments, a topical composition comprises a therapeutic agent dissolved, dispersed or suspended in a carrier. The carrier can be in the form of, e.g., a solution, a suspension, an emulsion, an ointment or a gel base, and can contain, e.g., petrolatum, lanolin, a wax (e.g., bee wax), mineral oil, a long-chain alcohol, polyethylene glycol or polypropylene glycol, a diluent (e.g., water and/or an alcohol [e.g., ethanol or propylene glycol]), an emulsifier, a stabilizer or a thickening agent, or a combination thereof. A topical composition can include, or a topical formulation can be administered by means of, e.g., a transdermal patch, a microneedle patch or an iontophoresis device. A transdermal patch can contain, e.g., a microporous membrane made of a suitable material (e.g., cellulose nitrate or acetate, propylene or a polycarbonate), a skin adhesive and backing material. A topical composition can deliver the therapeutic agent transdermally (including percutaneously and transmucosally) via a concentration gradient or an active mechanism (e.g., ionospheres).
Representative kinds of topical compositions are described below for purposes of illustration.
Topical Compositions Comprising a Permeation Enhancer
In some embodiments, a topical composition comprises a treprostinil derivative and a permeation enhancer. The composition can optionally contain an additional therapeutic agent.
The permeation enhancer increases the permeability of the skin or mucosa to the therapeutic agent(s). In certain embodiments, the permeation enhancer is N-lauroyl sarcosine, sodium octyl sulfate, methyl laurate, isopropyl myristate, oleic acid, glyceryl oleate or sodium lauryl sulfoacetate, or a combination thereof. In certain embodiments, the composition contains on a weight/volume (w/v) basis the permeation enhancer in an amount of about 1-20%, 1-15%, 1-10% or 1-5%. To enhance further the ability of the therapeutic agent(s) to penetrate the skin or mucosa, the composition can also contain a surfactant, an azone-like compound, an alcohol, a fatty acid or ester, or an aliphatic thiol.
The composition can further contain one or more additional excipients. Suitable excipients include without limitation solubilizers (e.g., C2-C8 alcohols), moisturizers or humectants (e.g., glycerol [glycerin], propylene glycol, amino acids and derivatives thereof, polyamino acids and derivatives thereof, and pyrrolidone carboxylic acids and salts and derivatives thereof), surfactants (e.g., sodium laureth sulfate and sorbitan monolaurate), emulsifiers (e.g., cetyl alcohol and stearyl alcohol), thickeners (e.g., methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, polyvinylpyrrolidone, polyvinyl alcohol and acrylic polymers), and formulation bases or carriers (e.g., polyethylene glycol as an ointment base). As a non-limiting example, the base or carrier of the composition can contain ethanol, propylene glycol and polyethylene glycol (e.g., PEG 300), and optionally an aqueous liquid (e.g., isotonic phosphate-buffered saline).
The topical composition can have any suitable dosage form, such as a solution (e.g., eye drop, nose drop or ear drop), a suspension, an emulsion, a cream, a lotion, a gel, an ointment, a paste, a jelly, a foam, or a spray. In some embodiments, the composition is applied to the skin or mucosa covering a surface area of about 10-800 cm2, 10-400 cm2 or 10-200 cm2. The composition can be formulated for transdermal or transmucosal administration of the therapeutic agent(s) to the systemic circulation, e.g., as a transdermal patch or a microneedle patch.
Topical Compositions Comprising a Permeation Enhancer and a Volatile Liquid
In further embodiments, a topical composition comprises a treprostinil derivative, a permeation enhancer and a volatile liquid. The composition can optionally contain an additional therapeutic agent.
The permeation enhancer increases the permeability of the skin or mucosa to the therapeutic agent(s). In some embodiments, the permeation enhancer is selected from the group consisting of C8-C18 alkyl aminobenzoates (e.g., C8-C18 alkyl p-aminobenzoates), C8-C18 alkyl dimethylaminobenzoates (e.g., C8-C18 alkyl p-dimethylaminobenzoates), C8-C18 alkyl cinnamates, C8-C18 alkyl methoxycinnamates (e.g., C8-C18 alkyl p-methoxycinnamates), and C8-C18 alkyl salicylates. In certain embodiments, the permeation enhancer is octyl salicylate, octyl p-dimethylaminobenzoate or octyl p-methoxycinnamate, or a combination thereof.
The volatile liquid can be any volatile, skin- or mucosa-tolerant solvent. In certain embodiments, the volatile liquid is a C2-C5 alcohol or an aqueous solution thereof, such as ethanol or isopropanol or an aqueous solution thereof. An aerosol propellant (e.g., dimethyl ether) can be considered as a volatile liquid. In some embodiments, the volatile liquid functions as a carrier or vehicle of the composition.
The composition can optionally contain a thickening agent. Non-limiting examples of thickening agents include cellulosic thickening agents (e.g., ethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methylcellulose), povidone, polyacrylic acids/polyacrylates (e.g., Carbopol® polymers), Sepigel® (polyacrylamide/isoparaffin/laureth-7), and the Gantrez® series of polymethyl vinyl ether/maleic anhydride copolymers (e.g., butyl ester of PMV/MA copolymer Gantrez® A-425).
In some embodiments, the composition contains on a weight basis about 0.1-5%, 0.5-5% or 1-5% of a treprostinil derivative, about 1-20%, 1-15% or 1-10% of the permeation enhancer, and about 40-98%, 45-95%, 50-90% or 60-80% of the volatile liquid. In further embodiments, the composition optionally contains on a weight basis about 1-40%, 1-30%, 1-20% or 5-20% water and/or about 0.1-15%, 0.5-10% or 1-5% of a thickening agent.
For purposes of illustration, in certain embodiments a topical spray composition contains about 0.1-5% w/v of a treprostinil derivative, about 2-10% w/v of octyl salicylate or octyl p-methyoxycinnamate, and about 95% aqueous ethanol as the carrier. In further embodiments, a topic gel composition comprises about 0.1-5% w/v of a treprostinil derivative, about 1-10% w/v of octyl salicylate or octyl p-methyoxycinnamate, about 0.5-5% w/v of a Carbopol® polyacrylic acid, and about 70% aqueous ethanol as the carrier, and optionally about 1-10% w/v of a basic solution (e.g., 0.1 N NaOH). In additional embodiments, a topical lotion composition contains about 0.1-5% w/v of a treprostinil derivative, about 1-10% w/v of octyl salicylate or octyl p-methyoxycinnamate, about 1-5% w/v of ethyl cellulose or hydroxypropyl cellulose, and about 90% aqueous ethanol as the carrier.
The composition can further comprise other excipients, such as a compounding agent (e.g., paraffin oil, silicone oil, a vegetable oil, or a fatty ester such as isopropyl myristate), a diluent, a co-solvent (e.g., acetone or a glycol ether such as diethylene glycol monoethyl ether), an emulsifier, a surfactant (e.g., an ethoxylated fatty alcohol, glycerol mono stearate or a phosphate ester), a stabiliser, an antioxidant or a preservative (e.g., a hydroxybenzoate ester), or a combination thereof. For example, a co-solvent and/or a surfactant can be used to maintain the therapeutic agent(s) in solution or suspension at the desired concentration.
The topical composition can have any suitable dosage form, such as a cream, a lotion, a gel, an ointment, a mousse, a spray or aerosol, or any transdermal device (e.g., a patch) that administers a drug by absorption through the skin or mucosa. In some embodiments, the topical composition is applied to the skin or mucosa covering a surface area of about 10-800 cm2, 10-400 cm2 or 10-200 cm2.
Topical Compositions Including a Permeation Enhancer and Another Excipient
In yet further embodiments, a topical composition comprises a treprostinil derivative, a permeation enhancer, and at least one of a lipophilic solvent, a formulation base and a thickener. In some embodiments, the composition contains a lipophilic solvent and a formulation base, or the same substance can function as both a lipophilic solvent and a formulation base. In further embodiments, the composition contains a lipophilic solvent, a formulation base and a thickener. The composition can optionally comprise an additional therapeutic agent.
The permeation enhancer increases the permeability of the skin or mucosa to the therapeutic agent(s). Non-limiting examples of permeation enhancers include dimethyl sulfoxide (DMSO), decylmethylsulfoxide, laurocapram, pyrrolidones (e.g., 2-pyrrolidone and N-methyl-2-pyrrolidine), surfactants, alcohols (e.g., oleyl alcohol), polyethylene glycol (e.g., PEG 400), diethylene glycol monoethyl ether, oleic acid, and fatty acid esters (e.g., isopropyl myristate, methyl laurate, glycerol monooleate, and propylene glycol monooleate).
Non-limiting examples of liphophilic solvents include lipophilic alcohols (e.g., hexylene glycol, octyldodecanol, oleyl alcohol and stearyl alcohol), polyethylene glycol (e.g., PEG 100, PEG 300, PEG 400 and PEG 3350), diethylene glycol monoethyl ether, polysorbates (e.g., Tween® 20 to 80), Labrasol®, fatty acid esters (e.g., isopropyl myristate and diisopropyl adipate), diethyl sebacate, propylene glycol monocaprylate, propylene glycol laurate, mono- and di-glycerides (e.g., Capmul® MCM), medium-chain triglycerides, caprylic/capric triglyceride, glyceryl monocaprylate, glyceryl mono-oleate, glyceryl mono-linoleate, glycerol oleate/propylene glycol, mineral oil, and vegetable oils.
A liphophilic solvent may also function as a formulation base or carrier. For example, polyethylene glycol (e.g., from PEG 100 to PEG 3500, such as PEG 300, PEG 400 and PEG 3350) can function as a liphophilic solvent and a formulation base.
The composition can also contain a hydrophilic solvent, such as a C1-C5 alcohol (e.g., ethanol, isopropanol, glycerol, propylene glycol and 1,2-pentanediol) and/or water.
The composition can contain a thickener to increase the viscosity and/or the physical stability of the composition. Examples of thickeners include without limitation glycerol, stearyl alcohol, and polymers (e.g., polydimethylsiloxane [dimethicone] and Carbopol® polymers).
In some embodiments, the composition further contains an antioxidant. Non-limiting examples of antioxidants include butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), tocopherols (e.g., Vitamin E and esters thereof), flavinoids, glutathione, ascorbic acid and esters thereof, DMSO, and chelating agents (e.g., EDTA and citric acid).
In certain embodiments, the topical composition comprises on a w/w basis about 0.1-5% or 0.5-5% of a treprostinil derivative, about 2-30% or 5-20% of a permeation enhancer, about 20-80% or 30-70% of a lipophilic solvent that may also function as a formulation base, about 0.1-10% or 1-7.5% of a thickener, and about 0.01-2% or 0.05-1% of an antioxidant. As a non-limiting example, a topical composition can contain a treprostinil derivative, PEG 400 and/or PEG 3350 as lipophilic solvent(s) and formulation base(s), diethylene glycol monoethyl ether, oleyl alcohol and/or isopropyl myristate as permeation enhancer(s), stearyl alcohol as a thickener, and BHT as an antioxidant.
The topical composition can have any suitable dosage form, such as a cream, a lotion, a gel, an ointment, a jelly, a paste, or any transdermal device (e.g., a patch) that administers a drug by absorption through the skin or mucosa.
Topical Compositions Comprising a Permeation Enhancer and an Adhesive
In additional embodiments, a topical composition comprises a treprostinil derivative, a permeation enhancer and an adhesive. The composition can optionally contain an additional therapeutic agent.
The permeation enhancer increases the permeability of the skin or mucosa to the therapeutic agent(s). The permeation enhancer can be, e.g., a fatty acid ester having a fatty acyl chain length of C8-C20 or C12-C18 and a C1-C6 or C2-C4 alcohol component (e.g., isopropanol). In certain embodiments, the permeation enhancer is isopropyl myristate or isopropyl palmitate. In some embodiments, the permeation enhancer is in an amount of about 0.1-20%, 0.5-15%, 1-15%, 2-12% or 4-10% by weight of the composition or the skin-contacting layer of a transdermal patch.
The adhesive maintains contact of the topical composition to the skin or mucosa. Non-limiting examples of adhesives include acrylics/acrylates (e.g., polyacrylates, including polyalkyl acrylates and Duro-Tak® polyacrylates), polyvinyl acetate, ethylenevinylacetate copolymers, polysiloxanes, polyurethanes, plasticized polyether block amide copolymers, natural and synthetic rubbers, plasticized styrene-butadiene rubber block copolymers (e.g., Duro-Tak® 87-6173), and mixtures thereof.
The topical composition can comprise one or more additional excipients. The additional excipient(s) can be, e.g., a diluent, an emollient, a plasticizer, or an agent that reduces irritation to the skin or mucosa, or a combination thereof.
In certain embodiments, the topical composition prior to application to the skin or mucosa is substantially free of water, tetraglycol (glycofurol) and/or a hydrophilic organic solvent (e.g., a C1-C5 alcohol).
The composition can administer the therapeutic agent(s) transdermally (including percutaneously and transmucosally) through a body surface or membrane such as intact unbroken skin or intact unbroken mucosal tissue into the systemic circulation.
In some embodiments, the topical composition is in the form of a transdermal patch for application to the skin or mucosa. The patch has a skin- or mucosa-contacting layer (“skin-contacting layer” for simplicity) laminated or otherwise attached to a support layer. The skin-contacting layer can be covered by a removable release liner before use to protect the skin-contacting surface and to keep it clean until it is applied to the skin or mucosa. The support layer of the patch acts as a support for the skin-contacting layer and as a barrier that prevents loss of the therapeutic agent(s) in the skin-contacting layer to the environment. The material of the support layer is compatible with the therapeutic agent(s), the permeation enhancer and the adhesive, and is minimally permeable to the components of the patch. The support layer can be opaque to protect the components of the patch from degradation via exposure to ultraviolet light. The support layer is also capable of binding to and supporting the adhesive layer, yet is sufficiently pliable to accommodate the movements of the subject using the patch. The material of the support layer can be, e.g., a metal foil, a metalized polyfoil, or a composite foil or film containing a polymer (e.g., a polyester [such as polyester terephthalate] or aluminized polyester, polyethylene, polypropylene, polytetrafluoroethylene, a polyethylene methyl methacrylate block copolymer, a polyether block amide copolymer, a polyurethane, polyvinylidene chloride, nylon, a silicone elastomer, rubber-based polyisobutylene, styrene, or a styrene-butadiene or styrene-isoprene copolymer). The release liner can be made of the same material as the support layer, or can be a film coated with an appropriate release surface.
Therapeutic Uses of Treprostinil Derivatives
In some embodiments, the compounds described herein are used to treat pulmonary hypertension. Accordingly, the disclosure provides a method of treating pulmonary hypertension, comprising administering to a subject in need of treatment a therapeutically effective amount of a treprostinil derivative, or a pharmaceutically acceptable salt, solvate, clathrate or polymorph thereof. Treprostinil derivatives include prodrugs of treprostinil. An additional therapeutic agent can optionally be administered to treat pulmonary hypertension.
Pulmonary hypertension is an increase of blood pressure in the lung vasculature, including the pulmonary artery, pulmonary vein and pulmonary capillaries. Thus, pulmonary hypertension encompasses pulmonary arterial hypertension (PAH) and pulmonary venous hypertension (PVH) (e.g., congestive heart failure). More broadly, pulmonary hypertension encompasses:
WHO Group I—pulmonary arterial hypertension, including idiopathic PAH, heritable PAH (e.g., BMPR2, ALK1 and endoglin [with or without hereditary hemorrhagic telangiectasia]), drug- and toxin-induced PAH, PAH associated with various conditions (e.g., connective tissue disease, HIV infection, portal hypertension, congenital heart disease, schistosomiasis, and chronic hemolytic anemia [e.g., sickle cell disease]), persistent pulmonary hypertension of the newborn, pulmonary veno-occlusive disease (PVOD), and pulmonary capillary hemangiomatosis (PCH);
WHO Group II—pulmonary hypertension owing to left heart disease, including systolic dysfunction, diastolic dysfunction and valvular heart disease;
WHO Group III—pulmonary hypertension owing to lung disease and/or hypoxia, including chronic obstructive pulmonary disease (COPD), interstitial lung disease, other pulmonary diseases with mixed restrictive and obstructive pattern, sleep-disordered breathing, alveolar hypoventilation disorders, chronic exposure to high altitude, and developmental abnormalities;
WHO Group IV—chronic thromboembolic pulmonary hypertension (CTEPH); and
WHO Group V—pulmonary hypertension with unclear multifactorial mechanisms, including hematologic diseases (e.g., myeloproliferative disease and splenectomy), systemic diseases (e.g., sarcoidosis, pulmonary Langerhans cell histiocytosis, lymphangioleiomyomatosis, neurofibromatosis and vasculitis), metabolic disorders (e.g., glycogen storage disease, Gaucher disease and thyroid diseases), and other causes (e.g., tumoral obstruction, fibrosing mediastinitis, and chronic renal failure on dialysis).
The therapeutically effective amount and frequency of administration of a treprostinil derivative to treat pulmonary hypertension may depend on various factors, including the type of pulmonary hypertension, the severity of the condition, the mode of administration, the age, body weight, general health, gender and diet of the subject, and the response of the subject to the treatment, and can be determined by the treating physician. In certain embodiments, the effective dose of a treprostinil derivative per day is about 0.1-100 mg, 0.1-50 mg, 0.5-50 mg, 0.5-25 mg, 0.5-10 mg, 1-10 mg or 1-5 mg, or as deemed appropriate by the treating physician, which can be administered in a single dose or in divided doses. In further embodiments, the effective dose of a treprostinil derivative per day is about 0.001-2 mg/kg, 0.005-1 mg/kg, 0.01-0.5 mg/kg or 0.01-0.1 mg/kg body weight, or as deemed appropriate by the treating physician.
In some embodiments, a treprostinil derivative is administered, in a single dose or in multiple doses, daily (including one, two, three or more times daily), every two days, every three days, twice weekly, thrice weekly, weekly, every 2 weeks, every 3 weeks, monthly, every 6 weeks, every 2 months or every 3 months, or as deemed appropriate by the treating physician. In further embodiments, a treprostinil derivative is administered under a chronic dosing regimen. In certain embodiments, a therapeutically effective amount of a treprostinil derivative is administered over a period of at least 2 weeks, 3 weeks, 1 month, 1.5 months, 2 months, 3 months, 4 months, 5 months, 6 months or longer.
A treprostinil derivative can be administered via any suitable route. Potential routes of administration of a treprostinil derivative include without limitation oral, parenteral (including intramuscular, subcutaneous, intradermal, intravascular, intravenous, intraarterial, intramedullary and intrathecal), intraperitoneal, and topical (including dermal/epicutaneous, transdermal, mucosal, transmucosal, intranasal [e.g., by nasal spray or drop], intraocular [e.g., by eye drop], pulmonary [e.g., by inhalation], buccal, sublingual, rectal and vaginal). In certain embodiments, a treprostinil derivative is administered orally. In other, embodiments, a treprostinil derivative is administered topically (e.g. dermally, transdermally, mucosally, transmucosally, intranasally, pulmonarily [e.g., by inhalation], or sublingually). In further embodiments, a treprostinil derivative is administered parenterally (e.g., subcutaneously or intravenously, including by injection or infusion).
In some embodiments, a treprostinil derivative is used to treat PAH. In further embodiments, an additional therapeutic agent is administered in combination with the treprostinil derivative to treat PAH. The additional therapeutic agent can be administered concurrently with or sequentially to (before or after) administration of the treprostinil derivative. If administered concurrently with the treprostinil derivative, the additional therapeutic agent can be contained in the same composition as the treprostinil derivative or in separate compositions.
In certain embodiments, the additional therapeutic agent for the treatment of PAH is selected from the group consisting of:
vasoactive agents, including without limitation prostaglandins and prostanoids (e.g., prostacyclin [prostaglandin I2] and beraprost), endothelin receptor (e.g., ETA and/or ETB) antagonists (e.g., ambrisentan, bosentan, sitaxentan and Actelion-1), phosphodiesterase type 5 (PDE5) inhibitors (e.g., sildenafil and tadalafil), activators of soluble guanylate cyclase (e.g., cinaciguat and riociguat), and analogs and derivatives thereof;
diuretics, including without limitation thiazide diuretics (e.g., bendroflumethiazide, chlorothiazide, epitizide and hydrochlorothiazide), thiazide-like diuretics (e.g., chlorthalidone, indapamide and metolazone), and analogs and derivatives thereof;
anticoagulants, including without limitation vitamin K antagonists (e.g., acenocoumarol, atromentin, coumarin, phenindione, phenprocoumon and warfarin), direct thrombin inhibitors (e.g., argatroban, dabigatran, hirudin, lepirudin and bivalirudin), direct factor Xa inhibitors (e.g., apixaban, betrixaban, darexaban, edoxaban, eribaxaban, letaxaban and rivaroxaban), heparin and derivatives thereof (e.g., unfractionated heparin, low molecular weight heparin, fondaparinux and idraparinux), others (e.g., antithrombin, batroxobin and hementin), and analogs, derivatives and fragments thereof; and
other kinds of therapeutic agents, including without limitation cardiac glycosides (e.g., digoxin, acetyldigoxin and digoxigenin) and oxygen therapy.
EXAMPLES
Additional embodiments are provided in the following, non-limiting examples.
Four assays on compounds were carried out by the following methods with the results shown in Table I.
(Test 1) Human liver microsomal stability assay was conducted by incubating 0.5 uM test compounds at 37° C. for up to 45 minutes in 50 mM of potassium phosphate buffer (pH 7.4) containing 0.5 mg of microsomal protein and 50 μL of NADPH generating system (7.8 mg of glucose 6-phosphate, 1.7 mg of NADPH and 6 U of glucose 6-phosphate dehydrogenase per mL in 2% w/v of sodium bicarbonate). At 0, 5, 15, 30 and 45 min., an aliquot was taken, quenched with internal standard containing stop solution. No co-factor controls at 45 minutes were also prepared. After incubation, the samples were analyzed by LC-MS/MS. Peak area ratios of analyte to internal standard were used to calculate the intrinsic clearance. The intrinsic clearance (CLint) was determined from the first order elimination constant by non-linear regression. Formation of the active drug Compound A over the time course was also monitored by LC-MS/MS analysis.
(Test 2) Human plasma stability assay was conducted by incubating 0.5 uM test compounds at 37° C. for up to 120 minutes in heparinated human plasma. At 0, 5, 15, 30, 60 and 120 and 240 min., an aliquot was taken, quenched with internal standard containing stop solution. After incubation, the samples were analyzed by LC-MS/MS. Peak area ratios of analyte to internal standard were used to calculate the half-life. Formation of the active drug Compound A over the time course was also monitored by LC-MS/MS analysis.
(Test 3) Human skin homogenate stability assay was conducted in a similar way as the human liver microsomal stability assay, by incubating 0.5 uM test compounds at 37° C. for up to 45 minutes in 50 mM of potassium phosphate buffer (pH 7.4) containing 0.5 mg of human skin homogenate protein and 50 μL of NADPH generating system (7.8 mg of glucose 6-phosphate, 1.7 mg of NADPH and 6 U of glucose 6-phosphate dehydrogenase per mL in 2% w/v of sodium bicarbonate). At 0, 5, 15, 30 and 45 min., an aliquot was taken, quenched with internal standard containing stop solution. No co-factor controls at 45 minutes were also prepared. After incubation, the samples were analyzed by LC-MS/MS. Peak area ratios of analyte to internal standard were used to calculate the intrinsic clearance. The intrinsic clearance (CLint) was determined from the first order elimination constant by non-linear regression. Formation of the active drug Compound A over the time course was also monitored by LC-MS/MS analysis.
(Test 4) Human hepatocyte stability assay was conducted by incubating 0.5 uM test compound at 37° C. for up to 240 minutes. Cryopreserved human hepatocytes were obtained from Celsis IVT (Baltimore, Md.). Cells were thawed according to vendor's instructions and were suspended in William's Medium E to 0.5 million cells/mL. Test compounds were spiked into the cell suspension to initiate the reactions. At 0, 10, 30, 60, 120 and 240 min., an aliquot was taken, quenched with internal standard containing stop solution. After incubation, the samples were analyzed by LC-MS/MS. Peak area ratios of analyte to internal standard were used to calculate the intrinsic clearance. The intrinsic clearance (CLint) was determined from the first order elimination constant by non-linear regression. Formation of the active drug Compound A over the time course was also monitored by LC-MS/MS analysis.
Assay results (half life) are shown in Table I. In Table I, the code for the results of the assay testing is:
A=<15 min
B=15-30 min
C=31-60 min
D=>60 min













TABLE I





Compd
MW
m/z
Test 1
Test 2
Test 3
Test 4


No.
(g/mol)
[M + Na]+
T1/2
T1/2
T1/2
T1/2





















A
390
413






1
444.62
467.62
A
A


2
443.63
466.63
A
D

C


3
503.68
526.68


4
450.6
473.6
A
A


5
460.62
483.62
A
A


6
476.62
499.62
A
A


7
433.59
456.59
B
D

B


8
432.61
455.61
C


9
434
457
A


10
448
471
A


11
447
470
A
D


12
461
484
A
D


13
475
498
A
D

A


14
471
494
A
D
D
A


15
404
427
A
A
A


16
460
483
A
B
B


17
460
483
A
C
B


18
474
497
A
D
D


19
484
507
A
C
B


20
432
455
A
C
A


21
521
544
A
D


22
488
511
A
D
D


23
488
511
A
D


24
472
495
A
D


25
476
499
A
D
C


26
446
489
A
B
B


27
532
555
A
D


28
446
469
A
B


57
372
395
D
D

D


60
446

A
C
C


61
446

A
B
C


62
460

A
C
D


63
460

A
C
C


64
502

A
D
D









Compounds 60 to 64 have the structure shown below:




Examples of Synthesis of Treprostinil Derivatives

The following representative syntheses are shown for compounds according to Formulae I, II, and III.
Example 1
Synthesis of: 2-[2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-N-(2,2,2-trifluoro-ethyl)-acetamide




A solution of {2-Hydroxy-1-[3-(tetrahydro-pyran-2-yloxy)-octyl]-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy}-acetic acid (94 mg, 0.2 mmol), trifluoroethylamine (54 mg, 0.6 mmol) and DIPEA (104 μl, 0.6 mmol) in DMF (2 ml) was treated with HATU and stirred 24 hr at RT. The reaction mixture was diluted with MTBE and washed with saturated sodium bicarbonate solution and brine, dried over sodium sulfate and concentrated under vacuum. The residue was purified by silica gel chromatography. This resulting material was dissolved in MeOH (4 ml), treated with Amberlite 1R120H and stirred 24 hr. The reaction mixture was filtered and concentrated to yield 2-[2-hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-N-(2,2,2-trifluoro-ethyl)-acetamide (46 mg) as an oil. 1HNMR (400 MHz, CDCl3) δ 7.06 (d, 1H, J=7.6); 6.80 (d, 1H, J=7.2); 6.63 (d, 1H, J=8.0); 4.86 (quint., 1H, J=6.4); 4.60 (s, 2H); 3.7-3.8 (m, 1H); 3.55-3.65 (m, 1H); 2.85-2.95 (ddd, 1H); 2.70-2.80 (dd, 1H); 2.50-2.60 (ddd, 1H); 2.40-2.50 (dd, 1H); 2.15-2.3 (m, 2H); 1.75-1.95 (m, 2H); 1.24-1.70 (m, 17H); 1.20 (d, 3H, J=6.4); 0.85-0.95 (m, 8H); MS: m/z 494 [M+Na]+
Example 2
Synthesis of: [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,2-dimethyl-propyl ester




A solution of {2-Hydroxy-1-[3-(tetrahydro-pyran-2-yloxy)-octyl]-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy}-acetic acid (47 mg, 0.1 mmol), 3-methyl-2-butanol (26 mg, 0.3 mmol) and DMAP (12 mg, 0.1 mmol) in DCM (1 ml) was treated with EDC (26 mg, 0.14 mmol) and stirred 24 hr at RT. The reaction mixture was diluted with MTBE and washed with saturated sodium bicarbonate solution and brine, dried over sodium sulfate and concentrated under vacuum. The residue was purified by silica gel chromatography. This resulting material was dissolved in MeOH/THF (4 ml), treated with Amberlite IR120H and stirred 24 hr. The reaction mixture was filtered and concentrated to yield [2-hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid 1,2-dimethyl-propyl ester (16 mg) as an oil. 1HNMR (400 MHz, CDCl3) δ 7.06 (d, 1H, J=7.6); 6.80 (d, 1H, J=7.2); 6.63 (d, 1H, J=8.0); 4.86 (quint., 1H, J=5.6); 4.60 (s, 2H); 3.7-3.8 (m, 1H); 3.55-3.80 (m, 1H); 3.55-3.70 (m, 1H); 2.85-2.95 (dd, 1H); 2.50-2.80 (dd, 1H); 2.50-2.60 (dd, 1H); 2.40-2.60 (dd, 1H); 2.15-2.30 (m, 2H); 1.75-1.95 (m, 2H); 1.35-1.80 (m, 17H); 1.19 (d, 3H, J=6.4); 0.85-0.95 (m, 8H); MS: m/z 483 [M+Na]+
Example 3
Synthesis of: treprostinil 2-hydroxy lactone




A solution of {2-Hydroxy-1-[3-(tetrahydro-pyran-2-yloxy)-octyl]-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy}-acetic acid (47 mg, 0.1 mmol) and DMAP (26 mg, 0.2 mmol) in DCM (1 ml) was treated with 2,4,6-trichlorobenzoyl chloride (27 mg, 0.11 mmol) and stirred 24 hr at RT. The reaction mixture was diluted with ethyl acetate and washed with saturated sodium bicarbonate solution and brine, dried over sodium sulfate and concentrated under vacuum. The residue was purified by silica gel chromatography. This resulting material was dissolved in MeOH/THF (4 ml), treated with Amberlite IR120H and stirred 24 hr. The reaction mixture was filtered and concentrated to yield treprostinil 2-hydroxy lactone (8 mg) as an oil. 1HNMR (400 MHz, CDCl3) δ 7.03 (dd, 1H, J=8.4Hz, J=7.6Hz); 6.74 (d, 1H, J=7.6Hz); 6.55 (d, 1H, J=8.4Hz) 4.53 (m, 1H); 4.46 (d, 1H, J=15.2Hz); 4.31 (d, 1H, J=15.2Hz); 3.53 (m, 1H); 2.5 (m, 1H); 2.8 (dd, 1H); 2.6 (dd, 1H); 2.2-2.55 (m, 4H); 1.53 (m, 4H); 1.35-1.47 (m, 4H); 1.3 (m, 6H); 0.89 (m, 3H); MS: m/z 395 [M+Na]+
Example 4
Synthesis of: Cyclopropanecarboxylic acid 1-(3-hydroxy-octyl)-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-2-yl ester




A solution of [2-Hydroxy-1-(3-hydroxy-octyl)-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-5-yloxy]-acetic acid methyl ester (32 mg, 0.06 mmol), DIPEA (31 μl, 0.18 mmol) and DMAP (1 crystal) in DCM (2 ml) was treated with cyclopropanecarbonyl chloride (8 μl, 0.08 mmol) and stirred for 24 hr at RT under nitrogen. The reaction mixture was diluted with MTBE and washed with saturated sodium bicarbonate solution and brine, dried over sodium sulfate and concentrated under vacuum. The residue was purified by silica gel chromatography. This resulting material was dissolved in MeOH/THF (4 ml), treated with Amberlite IR120H and stirred 24 hr. The reaction mixture was filtered and concentrated to yield cyclopropanecarboxylic acid 1-(3-hydroxy-octyl)-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-2-yl ester (32 mg) as an oil. 1HNMR: (400 MHz, DMSO-d6) δ 7.06 (d, 1H, J=7.6); 6.80 (d, 1H, J=7.2); 6.63 (d, 1H, J=8.8); 4.78 (s, 2H); 4.1-4.2 (m, 1H); 4.05-4.50 (m, 1H); 3.68 (s, 3H); 2.6-2.8 (m, 2H); 2.4-2.5 (m, 2H); 2.20-2.35 (m, 1H); 2.10-2.20 (m,1H); 1.8-1.95 (m, 1H); 1.10-1.16 (m, 15H); 0.95-1.10 (m, 1H); 0.70-0.90 (m, 7H); MS: m/z 495 [M+Na]+
Example 5
Synthesis of Formula III Compound




A solution of acrylic acid 1-[2-(2-acryloyloxy-5-methoxycarbonylmethoxy-2,3,3a,4,9,9a-hexahydro-1H-cyclopenta[b]naphthalen-1-yl)-ethyl]-hexyl ester (51 mg, 0.1 mmol) in chloroform (20 ml) is treated with a solution of (PCy3)2Cl2Ru═CHPh (19 mg, 0.023 mmol) in chloroform (3 ml) and stirred 24 hr at RT. TEA (1 ml) is added and the solution is concentrated under vacuum. The residue is purified by silica gel chromatography to yield the title compound.
Additional synthetic schemes are shown below:
Example 6
Formula I Compound




Example 7
Formula I Compound

## Claims

1. A compound according to the following formula:




wherein:
R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35 and R36 are independently H or deuterium;
Z is P1, wherein P1 is selected from the group consisting of:





wherein:
m is 1, 2, 3 or 4;
R14 and R15 are independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl; or
R14 and R15 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring optionally incorporating one or two ring heteroatoms chosen from N, O and S, which is unsubstituted or substituted with 1, 2 or 3 substituents independently selected from the group consisting of halo, methyl and methoxy;

R18 and R19 are independently in each occurrence hydrogen or alkyl, wherein the alkyl is unsubstituted or substituted with 1 substituent selected from the group consisting of halo, hydroxy, alkoxy, amino, thio, methylthio, —C(O)OH, —C(O)O-(alkyl), —CONH2, aryl and heteroaryl, wherein the aryl or heteroaryl are unsubstituted or substituted with a substituent selected from the group consisting of alkyl, halo, haloalkyl, hydroxy, alkoxy, and haloalkoxy;
R14 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
R14 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring;
R15 and R18 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring; and
R15 and R19 taken together with the atoms to which they attach optionally form a 5- to 7-membered ring; and


R1 and R2 are independently H or P2, wherein P2 is selected from the group consisting of:





wherein:
m is 1, 2, 3 or 4; and
R14 is independently in each occurrence selected from the group consisting of H, alkyl, cycloalkyl, alkylcycloalkyl, haloalkyl, heteroalkyl, substituted alkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl, substituted aryl, substituted heteroaryl, substituted arylalkyl, and substituted heteroarylalkyl;



or an enantiomer or a pharmaceutically acceptable salt thereof.

2. The compound of claim 1, wherein R1 is H and R2 is P2.

3. The compound of claim 1, wherein R1 is P2 and R2 is H.

4. The compound of claim 1, wherein R1 is P2 and R2 is P2.

5. The compound of claim 1, wherein R1 and R2 are each H.

6. The compound of claim 1, wherein each of R20 to R36 is H.

7. The compound of claim 1, wherein at least one of R20 to R36 is deuterium.

8. A composition comprising at least one compound according to claim 1 and at least one other component.

9. The composition of claim 8, which is formulated for transdermal delivery.

10. The composition of claim 9, which is formulated for transdermal delivery with a patch.

11. The composition of claim 8, further comprising at least one solvent.

12. A method of treating pulmonary hypertension, comprising administering to a subject in need of treatment a therapeutically effective amount of a compound of claim 1 or a pharmaceutically acceptable salt, solvate, or enantiomer thereof.

13. The method of claim 12, wherein the pulmonary hypertension is pulmonary arterial hypertension.

14. The method of claim 12, wherein the compound is administered topically.

15. The method of claim 14, wherein the compound is administered transdermally.

16. The method of claim 15, wherein the compound is administered via a transdermal patch.

17. The method of claim 12, further comprising administering an additional therapeutic agent selected from the group consisting of vasoactive agents, diuretics, anticoagulants and cardiac glycosides.