Cinchonidine salt of (4S,5S)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-4,5-dihydro-1H-pyrazole-3-carboxylic acid, useful as intermediate in the preparation of cannabinoid CB1 neutral antagonists
申请人:Esteve Química, S.A.
公开号:EP2314578A1
公开(公告)日:2011-04-27
The present invention relates to a cinchonidine salt of (4S,5S)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-4,5-dihydro-1H-pyrazole-3-carboxylic acid. This cinchonidine salt is prepared by enantiomeric resolution of a compound of formula (I) comprising:
the reaction of compound of formula (I) with cinchonidine in a suitable solvent, thereby resulting in the cinchonidine salt of the enantiomer (4S,5S) of formula (II); and optionally isolating said salt. The cinchonidine salt according to formula (II) is a useful intermediate in the preparation of a cannabinoid CB1 neutral antagonist.
本发明涉及(4S,5S)-5-(4-氯苯基)-1-(2,4-二氯苯基)-4-甲基-4,5-二氢-1H-吡唑-3-羧酸的金雀碱盐。该金雀碱盐通过在适当溶剂中将化合物(I)与金雀碱反应而制备得到,从而得到化合物(I)的对映体(4S,5S)的金雀碱盐;并且可选择性地分离所述盐。根据化合物(II)的金雀碱盐是制备大麻素CB1中性拮抗剂的有用中间体。