PROCESS FOR THE PREPARATION OF L-DOPA AND L-M-TYROSINE AND RELATED COMPOUNDS AND INTERMEDIATES USED IN SUCH A PROCESS

摘要

1334591 Substituted phenyl alanines ASTRA LAKEMEDEL AB 18 Jan 1971 [19 Jan 1970 25 June 1970 (2)] 2381/71 Heading C2C L-isomers of compounds of Formula IV wherein RSP11/SP is a hydroxy group or an alkoxy group with not more than 5 carbon atoms and RSP111/SP is hydrogen, a hydroxy group or an alkoxy group with not more than 5 carbon atoms or wherein RSP11/SP and RSP111/SP together is an alkylenedioxy group with one or two carbon atoms which comprises incubating a stereoselective acting E. coli-acylase with a novel compound of formula wherein X is H, F, Cl, Br or NO 2 which is prepared either by acylation of a dl-compound of Formula III above or an ester thereof followed by hydrolysis of any ester link, or by hydrogenation of a compound of formula Ethers may be converted to OH compounds by standard methods. Intermediates are obtained according to the following reaction scheme Pharmaceutical compositions in conventional forms comprise an above L-isomer prepared by the above process and a diluent or carrier therefor.