Pictet-Spengler reaction in trifluoroacetic acid. Large scale synthesis of pyridoindolobenzodiazepine as an atypical antipsychotic agent
作者:Lin-hua Zhang、W. Meier、E. Wats、T.D. Costello、P. Ma、C.L. Ensinger、J.M. Rodgers、I.C. Jacobson、P. Rajagopalan
DOI:10.1016/0040-4039(95)01812-v
日期:1995.11
Traditional syntheses of benzodiazepines involve a Bischler-Napieralski reaction which is a three step process and gives low overall yields. An attractive alternative is to construct the diazepine ring under Pictet-Spengler conditions. This paper reports the synthesis of a novel pyridoindolo-benzodiazepine as a potent atypical antipsychotic agent. The key step in the synthesis is the ring formation of the diazepine ring in neat trifluoroacetic acid.