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。
A metal-free tandem cycloaddition strategy for the synthesis of indolizines from pyridine derivatives and γ-bromo-crotonates under mild conditions
作者:Yanqiu Li、Bingchuan Yang、Yan Sun、Huayi Wang、Huipeng Li、Shuai Fang、Xiaoyi Niu、Chen Ma
DOI:10.1039/c3ra43613f
日期:——
for the construction of indolizines has been proposed from easily available pyridine derivatives and γ-bromo-crotonates via a metal-free tandem process. A variety of indolizine derivatives were synthesized undermildconditions. Noteworthy features of this synthetic strategy are short reaction time, using air as oxidant and mild reaction conditions.