New Application of Pictet−Spengler Reaction Leading to the Synthesis of an Unusual Seven-Membered Heterocyclic Ring System
作者:Bijoy Kundu、Devesh Sawant、Pankaj Partani、Amit P. Kesarwani
DOI:10.1021/jo050384h
日期:2005.6.1
Pictet−Spengler reaction is reported. Our strategy involves reaction of arylamines, linked to the N-1 of disubstituted imidazoles, with aldehydes in the presence of p-TsOH. The iminium ion generated in situ undergoes C−C bond formation with the C-5 of the imidazoles to furnish triazabenzoazulenes as a novel heterosystem. Our strategy differs from conventional Pictet−Spengler reaction since the latter