Synthesis of<i>N</i>-Substituted Pyrroles From Azlactones via 1,3-Oxazolium 5-Oxides
作者:Fred. M. Hershenson、Michael R. Pavia
DOI:10.1055/s-1988-27785
日期:——
In situ N-alkylation of azlactones (1,3-oxazol-5(4H)-ones) with reactive alkylating agents has been successfully accomplished. The resulting mesoionic 1,3-oxazolium 5-oxides (munchnones) are further transformed into N-alkylated pyrroles via a 1,3-dipolar cycloaddition reaction with a dipolarophile (dimethyl acetylenedicarboxylate) in the presence of 2,6-di-tert-butylpyridine.