Iodine-Promoted Synthesis of 1-Alkyl-3-aroylindolizines from<i>N</i>-(Aroylmethyl)pyridinium Salts and Aliphatic Aldehydes
作者:Chen Tan、Peiyun Yan、Weijian Ye、Juan Yao、Weiming Wu、Cunde Wang
DOI:10.1002/hc.21137
日期:2014.1
An effective and practical method has been developed for the diversity-oriented synthesis of 1-alkyl-3-aroylindolizines via the 1,3-dipolar cycloaddition of pyridinium ylides and aliphaticaldehydes in the presence of molecular iodine and a catalytic amount of MnO2. The synthesis proceeds by tandem reactions involving [3+2] cycloaddition, dehydration of the cycloadduct, and dehydroaromatization. Molecular