Method for the production of 6-(4-chlorophenyl)-2,2-dimethyl-7-phenyl-2,3-dihydro-1h-pyrrolizin-5-ylacetic acid
申请人:——
公开号:US20040236117A1
公开(公告)日:2004-11-25
The invention relates to a process for the preparation of 6-(4-chlorophenyl)-2,2-dimethyl-7-phenyl-2,3-dihydro-1H-pyrrolizin-5-ylacetic acid, in which 5-benzyl-3,3-dimethyl-3,4-dihydro-2H-pyrrole is reacted with &ohgr;-bromo-4-chloroacetophenone with formation of 6-(4-chlorophenyl)-2,2-dimethyl-7-phenyl-2,3-dihydro-1H-pyrrolizine and the acetic acid group is introduced into the 5-position, 5-benzyl-3,3-dimethyl-3,4-dihydro-2H-pyrrole being obtained by hydrogenation of 2,2-dimethyl-4-oxo-5-phenylvaleronitrile or a ketal thereof. The invention also relates to processes for the preparation of intermediates occurring in the above process.
该发明涉及一种制备6-(4-氯苯基)-2,2-二甲基-7-苯基-2,3-二氢-1H-吡咯烷-5-乙酸的过程,其中5-苄基-3,3-二甲基-3,4-二氢-2H-吡咯烷与&ohgr;-溴-4-氯乙酰苯反应,形成6-(4-氯苯基)-2,2-二甲基-7-苯基-2,3-二氢-1H-吡咯啉,并在5位引入乙酸基,5-苄基-3,3-二甲基-3,4-二氢-2H-吡咯烷可由2,2-二甲基-4-氧代-5-苯基戊二腈或其缩醛经氢化得到。该发明还涉及上述过程中出现的中间体的制备方法。