Synthesis of Pyrrolo[2,1,5-<i>cd</i>]indolizines through Dehydrogenative Heck Annelation of Indolizines with Diaryl Acetylenes Using Dioxygen as an Oxidant
作者:Huayou Hu、Guodong Li、Weiming Hu、Yun Liu、Xiang Wang、Yuhe Kan、Min Ji
DOI:10.1021/ol503681n
日期:2015.3.6
A dehydrogenative Heck annelation reaction of indolizine with diaryl acetylene via dual C-H bond cleavage was developed. Oxygen gas was employed as a clean oxidant in this catalysis under base-free conditions. Diarylpyrrolo[2,1,5-cd]indolizines were synthesized with high atom economy. In addition, kinetic isotope experiments provided evidence for C-H bond metalation of the 5-position of the indolizine as the rate-limiting step.