摘要:
The present invention relates to an improved process for the preparation of (S)- 2,6-diamino-4,5,6,7-tetrahydrobenzothiazole of formula (II) useful in the preparation of pramipexole or (S)-2,6-amino-6-(n-propylamino)-4,5,6,7-tetrahydrobenzothiazole of formula (I) and its pharmaceutically acceptable salts or solvates thereof. The present invention further provides a process for the preparation of Pramipexole and its pharmaceutically acceptable salts, hydrates, solvates thereof.
摘要:
TAbstract A process for the preparation of 2-[2-[4-[(4-chloro phenyl) phenyl methyl]-1-piperazinyl] ethoxy acetic acid of formula (Ia) and pharmaceutically acceptable salts thereof, and compounds of formula (IIa) and (VIIIa), wherein R1 = H or C1-C4 alkyl; R2 = aryl or heteroaryl or R1 and R2 together with the carbon to which they are attached form a C3-C8 cycloalkyl group and X is a suitable leaving group for example, chlorine, bromine, iodine, 4-methylphenyl-sulfonyloxy, methylsulfonyloxy group or 4-bromophenyl-sulfonyloxy group are described.
摘要:
The invention relates to an improved process for the manufacture of enantiomerically pure R-(+) or S-(+)-5-(2-aminopropyl)-2-methoxybenzene sulfonamide by resolution of (R,S)-5-(2-aminopropyl)-2-methoxybenzene sulfonamide with D-(-) or L-(+)-tartaric acid to form a mixture of diastereomeric salts, separating the diastereomeric salts by kinetic resolution in a mixture of solvent systems of the kind such as herein described, in the specified time and temperature range to provide said R-(-)-5-(2-aminopropyl)-2-methoxybenzene sulfonamide or S-(+)-5-(2-aminopropyl)-2-methoxybenzenesulfonamide with excellent chiral purity more than 99.9 %.
摘要:
TAbstract A process for the preparation of 2-[2-[4-[(4-chloro phenyl) phenyl methyl]-1-piperazinyl] ethoxy acetic acid of formula (Ia) and pharmaceutically acceptable salts thereof, and compounds of formula (IIa) and (VIIIa), wherein R1 = H or C1-C4 alkyl; R2 = aryl or heteroaryl or R1 and R2 together with the carbon to which they are attached form a C3-C8 cycloalkyl group and X is a suitable leaving group for example, chlorine, bromine, iodine, 4-methylphenyl-sulfonyloxy, methylsulfonyloxy group or 4-bromophenyl-sulfonyloxy group are described.