Rhodium catalyzed hydroformylation of 1,1-bis(p-fluorophenyl)allyl or propargyl alcohol: a key step in the synthesis of Fluspirilen and Penfluridol
作者:Carlo Botteghi、Mauro Marchetti、Stefano Paganelli、Francesco Persi-Paoli
DOI:10.1016/s0040-4020(00)01151-0
日期:2001.2
Penfluridol (2), two neuroleptic agents, belong to a wide class of pharmaceuticals that contain in their molecules a 4,4-bis(p-fluorophenyl)butyl group bound to a nitrogen atom of a pyrrolidine, piperidine or piperazine moiety. A key intermediate for the synthesis of compounds 1 and 2, 4,4-bis(p-fluorophenyl)butylbromide (15), has been prepared starting from commercially available 4,4′-difluorobenzophenone
两种精神抑制药Fluspirilen(1)和Penfluridol(2)属于一类广泛的药物,其分子中含有与吡咯烷,哌啶或吡咯烷的氮原子结合的4,4-双(对氟苯基)丁基哌嗪部分。按照涉及铑的制备路线,由市售的4,4'-二氟二苯甲酮(7)开始制备用于合成化合物1和2的关键中间体4,4-双(对氟苯基)丁基溴(15)。甲苯或双相体系中的催化加氢甲酰化反应甲苯/水或环己烷/ 1,1-双(水)对氟苯基)-2-丙烯醇(8)和/或1,1-双(对氟苯基)-2-丙炔醇(12)。Fluspirilen和五氟利均在70-80%的收率得到由溴化反应15与1-苯基-1,3,8-三氮杂螺[4,5]癸烷-4-酮(16)和4- [4-氯-3- -(三氟甲基)苯基] -4-哌啶醇(17)。基于起始酮7,两种药物1和2的总产率约为35-40%。