The present invention relates to a process for the enantiomeric enrichment of salbutamol and salbutamol precursors and the acid-addition salts thereof:
where R is hydrogen or benzyl, R' is hydrogen or benzyl and X is CH2OH or COO-C1-C4-alkyl
the process comprising the crystallization of a compound of the formula I in the form of its acid-addition salt with an achiral carboxylic acid A that has at least three carbon atoms and a solubility of less than 50 g/l in water at pH < 3, 20°C and 1013 mbar, from a solution containing a mixture of the enantiomers of the compound of formula I and the achiral carboxylic acid A in the presence of seed crystals of the desired enantiomer of the compound of formula I or the acid addition salt thereof, whereby the enantiomerically enriched acid-addition salt of the compound of formula I is obtained.
本发明涉及一种用于左右旋
沙丁胺醇及其前体化合物及其酸加成盐的对映体富集的过程,其中R为氢或苄基,R'为氢或苄基,X为CH2OH或COO-C1-C4-烷基。该过程包括将式I化合物的酸加成盐与至少具有三个碳原子且在pH < 3、20°C和1013 mbar下水中的溶解度小于50 g/l的非手性羧酸A结晶,从含有式I化合物和非手性
羧酸A的对映体混合物的溶液中,在所需的式I化合物的对映体或其酸加成盐的种晶的存在下,获得对映体富集的式I化合物的酸加成盐。