Patent KR-950006891-B1 (KR)
Title: Process for the preparation of amino alcohols
Inventor: AUBARD GILBERT
IPC: A61K31/10
Filed: 1987-01-30
Granted: 1995-06-26
Abstract: 1. Claims (for the Contracting States : BE, CH, DE, FR, GB, IT, LI, LU, NL, SE) Aminoalcohols of formula   see diagramm : EP0237366,P25,F1   in which R1 is lower alkyl and R2 is H or lower alkyl, R3 is H, lower alkyl, lower alkenyl, lower phenylalkyl or lower cycloalkylalkyl with 3 to 6 carbon atoms in the cycle or, when R2 is H, lower alkanoyl, lower phenylalkanoyl or cycloalkylcarbonyl having 3 to 6 carbon atoms in the cycle, or R2 and R3 form together with the nitrogen atom to which they are linked, a heterocycle saturated with 5 to 7 chain links which can have, as the second heteroatom not directly connected to the nitrogen atom, an oxygen, a sulphur or a nitrogen, the latter nitrogen heteroatom possibly carrying an alkyl substituent in C1 to C4 , and their acid addition salts. 1. Claims (for the Contracting States : AT, ES) Process for the preparation of aminoalcohols of formula   see diagramm : EP0237366,P26,F2   in which R1 is lower alkyl and R2 is H or lower alkyl, R3 is H, lower alkyl, lower alkenyl, lower phenylalkyl or lower cycloalkylalkyl with 3 to 6 carbon atoms in the cycle, or when R2 is H, lower alkanoyl, lower phenylalkanoyl or cycloalkylcarbonyl having 3 to 6 carbon atoms in the cycle, or R2 and R3 form together with the nitrogen atom to which they are linked, a heterocycle saturated with 5 to 7 chain links and which can comprise, as the second heteroatom not directly linked with the nitrogen atom, an oxygen, a sulphur or a nitrogen, whereby said latter nitrogen heteroatom can carry an alkyl substituent in C1 to C4 and their acid addition salts, characterized in that it comprises : reducing an acid of formula   see diagramm : EP0237366,P27,F1   by a boron or aluminium hydride to obtain compounds (la), in which R2 and R3 are hydrogen and for obtaining compounds (lb), in which NR2 R3 form a heterocycle performing a cyclization by reacting a compound (la) with a reagent of formula X-(CH2 )m -R5 -(CH2 )n -X' in which X and X', which can be the same or different, are halogen, R5 is a single valence bond and m and n are integers between 1 and 3, with m + n equal to or greater than 4 and equal to or less than 6, or R5 is an oxygen, a sulphur or NR6 , R6 being H or alkyl in C1 to C4 and m and n are integers between 1 and 3 with m + n equal to or higher than 3 and equal to or lower than 5 and for preparing compounds (lc), in which R3 is alkanoyl, phenylalkanoyl or cycloalkylcarbonyl, acylating a compound (la) with an acylating agent of formula R4 -COX, in which X is a halogen and R4 is the homolog immediately below R3 and for preparing compounds (ld), in which R2 is H and R3 is alkyl, alkenyl, phenylalkyl or cycloalkylalkyl, alkylating a compound (la) using an alkylating agent R3 -X, X being a halogen, or reducing a compound (lc) by a boron or aluminium hydride, or reducing a compound of formula   see diagramm : EP0237366,P27,F2   by a boron or aluminium hydride and for preparing compounds (le), in which R2 is alkyl and R3 identical to R2 , reacting a compound (la) with an aldehyde of formula R4 CHO in the presence of formic acid and for preparing compounds (le) in which R2 is alkyl and R3 is alkyl, alkenyl, phenylalkyl or cycloalkylalkyl, reacting a compound (ld) with an aldehyde of formula R4 CHO in the presence of formic acid and, for preparing the acid addition salts, reacting the compounds (l) with an acid. 1. Claims (for the Contracting State GR) Aminoalcohols of formula   see diagramm : EP0237366,P28,F1   in which R1 is lower alkyl and R2 is H or lower alkyl, R3 is H, lower alkyl, lower alkenyl, lower phenylalkyl or lower cycloalkylalkyl with 3 to 6 carbon atoms in the cycle or, when R2 is H, lower alkanoyl, lower phenylalkanoyl or cycloalkylcarbonyl having 3 to 6 carbon atoms in the cycle, or R2 and R3 form together with the nitrogen atom to which they are linked, a heterocycle saturated with 5 to 7 chain links which can have, as the second heteroatom not directly connected to the nitrogen atom, an oxygen, a sulphur or a nitrogen, the latter nitrogen heteroatom possibly carrying an alkyl substituent in C1 to C4 , and their acid addition salts.