Heck-Type Cross-Dehydrogenative Coupling Reactions of Indolizines at the 3-Position with Electron-Deficient Alkenes through Palladium-Catalyzed CH Activation
作者:Huayou Hu、Yun Liu、Hao Zhong、Yulan Zhu、Chao Wang、Min Ji
DOI:10.1002/asia.201101050
日期:2012.5
A cross‐dehydrogenative coupling reaction of indolizines with electron‐deficient alkenes for the synthesis of 3‐alkenyl‐substituted indolizines has been reported. The reaction takes place at the 3‐position selectively through palladium‐catalyzed CH activation, following a Heck‐type cross‐coupling reaction under mild and ligand‐free conditions. Furthermore, the reaction mechanism of the PdII/Pd0 catalytic
据报道,吲哚嗪与缺乏电子的烯烃发生交叉脱氢偶联反应,可合成3-烯基取代的吲哚嗪。在温和且无配体的条件下发生Heck型交叉偶联反应后,该反应通过钯催化的CH活化选择性地在3位发生。此外,还通过1 H NMR光谱证实了Pd II / Pd 0催化途径的反应机理。
Synthesis of Biindolizines through Highly Regioselective Palladium-Catalyzed C−H Functionalization
作者:Ji-Bao Xia、Xue-Qiang Wang、Shu-Li You
DOI:10.1021/jo802227u
日期:2009.1.2
Biindolizines were synthesized under mild conditions with excellent regioselectivity in high yields through palladium-catalyzed C-H functionalization of indolizines. Synthesis of a macrocyclic compound was also achieved via intramolecular double C-H functionalization.
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.