Organotin(IV) enamines as selective reagents: Coupling with α-halocarbonyls for synthesis of substituted pyrroles
作者:Makoto Yasuda、Junji Morimoto、Ikuya Shibata、Akio Baba
DOI:10.1016/s0040-4039(97)00598-4
日期:1997.5
Effective coupling of tin enamines 1 and α-haloaldehydes 2 gave 2,4-disubstituted pyrroles in high yields at room temperature even under aqueous conditions. The reaction with 2-bromoacetophenone gave 3,4-disubstituted pyrroles, while the addition of HMPA changed the selectivity to afford the 2,4-isomer predominantly (27:73).