[EN] THE PREPARATION METHOD OF (1 R,2S)-(-)-EPHEDRINE OR ITS HYDROCHLORIDE<br/>[FR] PROCEDE DE PREPARATION DE (1R, 2S)-(X)-EPHEDRINE OU D'UN HYDROCHLORURE DE CETTE DERNIERE
申请人:SHANGHAI INST PHARM INDUSTRY
公开号:WO2005121066A1
公开(公告)日:2005-12-22
IN this invention, (1 R,2S)-(-)-ephedrine is obtained by reacting, [(S)-(-)-α-methylaminophenylacetone]2 . (2R,3R)-tartaric acid derivatives or the salts of (S)-(-)-α-methylaminophenylacetone and other organic acids with metal borohydride or the mixture consisting of metal borohydride and lewis acid. Since the staring materials don't racemize during the reductive reaction, the ephedrine should be predominant in the product. In addition, the utilization of the metal borohydride is high.
Oxidative conversions of sulfene-cycloadducts from azaheptafulvenes and from tropone to 1,2-disubstituted indoles and 2-aryl-benzofurans, respectively