Preparation of 1-phenyl-2-substituted aminopropane derivatives, useful as intermediates for the muscle relaxant R-tamsulosine, by reacting unsubstituted amine with reactive phenoxyacetic acid derivative

摘要

Preparation of 1-methoxyphenyl-2-phenoxyalkylamino-propane derivatives (II). Preparation of 1-methoxyphenyl-2-phenoxyalkylamino-propane derivatives of formula (II) comprises coupling reaction between amine (IV) and reactive phenoxyacetic acid compound (III). [Image] [Image] Q : oxygen or sulfur; R 3halo or NR 5R 2; R 4hydrogen, 1-7C alkyl, aryl, 1-7C acyl, aroyl, or QR 4 is isothiocyanato, arylsulfone or thioamidine when Q = S, or is 1-7C alkylisourea, tri(1-7C alkyl)silyloxy, tosyl, mesyl, nosyl, trifluoromethanesulfonyl or trifluoroacetyl when Q = O; R 5 and R 2hydrogen, 1-7C alkyl, aryl, 1-7C alkylaryl, 1-7C acyl, aroyl, 1-7C alkoxycarbonyl or aryloxycarbonyl, or NR 5R 2 may be NHR 2 when R 2 is a protecting group; when the broken line indicates that a ring is not formed, then Y : CO, =C- or CH 2, but when it indicates that a ring is formed, then Y = CH or =C; the bond between N and Y is single or double; R 1halo, SR 4 or OR 4, or R 1 and R 2together form oxazolidin-2-one, thiazolidin-2-one or thiazolidin-2-thione; Y' : COOH, COCl, CHO, CH 2X when R 1 = SR 4 or OR 4; Y' = CHO when R 1 = SH or SR 4; Y' = COCl or CH 2X when R 1 and R 2 together form a ring as specified; or Y' = CSSNa when R 1 = halo, tosyl, mesyl, nosyl, trifluoromethanesulfonyl or trifluoroacetyl; X = chloro, bromo or iodo. Independent claims are also included for: (1) preparation of (R)-tamsulosine (I) or its salts ((R)-(-)-5-[2-[2-(2-ethoxyphenoxy)ethylamino]propyl]-2-methoxybenzenesulfonamide) from (II); and (2) (II) and (IV).