Highly Efficient Synthesis of Functionalized Indolizines and Indolizinones by Copper-Catalyzed Cycloisomerizations of Propargylic Pyridines
摘要:
[GRAPHICS]The copper-catalyzed cycloisomerizations of 2-pyridyl-substituted propargylic acetates and its derivatives are described, which offer an efficient route to C-1 oxygenated indolizines with a wide range of substituents under mild reaction conditions. The presented method could be readily applied to the synthesis of indolizinones through a cyclization/1,2-migration of tertiary propargylic alcohols.
Highly Efficient Synthesis of Functionalized Indolizines and Indolizinones by Copper-Catalyzed Cycloisomerizations of Propargylic Pyridines
作者:Bin Yan、Yebing Zhou、Hao Zhang、Jingjin Chen、Yuanhong Liu
DOI:10.1021/jo070983j
日期:2007.9.1
[GRAPHICS]The copper-catalyzed cycloisomerizations of 2-pyridyl-substituted propargylic acetates and its derivatives are described, which offer an efficient route to C-1 oxygenated indolizines with a wide range of substituents under mild reaction conditions. The presented method could be readily applied to the synthesis of indolizinones through a cyclization/1,2-migration of tertiary propargylic alcohols.
Expeditious synthesis of indolizine derivatives via iodine mediated 5-endo-dig cyclization
作者:Ikyon Kim、Jihyun Choi、Hye Kyoung Won、Ge Hyeoung Lee
DOI:10.1016/j.tetlet.2007.07.180
日期:2007.9
Iodine-mediated 5-endo-dig cyclization of propargylic esters 2 at room temperature proceeded smoothly to give highly functionalized indolizines 3 in excellent yields. A pyridine group was employed as a nucleophilic partner in this facile process for the first time.