Pd-Catalyzed Oxidative Coupling of Enamides and Alkynes for Synthesis of Substituted Pyrroles
摘要:
A novel and efficient palladium(II)-catalyzed alkenyl C-H activation oxidative annulation of enamides with alkynes for the synthesis of substituted pyrroles has been developed. The reaction tolerates a wide range of functional groups and is a reliable method for the synthesis of triaryl-substituted pyrroles in high yields.
Versatile Pyrrole Synthesis through Ruthenium(II)-Catalyzed Alkene C–H Bond Functionalization on Enamines
作者:Lianhui Wang、Lutz Ackermann
DOI:10.1021/ol303224e
日期:2013.1.4
An efficient ruthenium(II) catalyst enabled broadly applicable oxidative alkyne annulations with electron-rich enamines to provide diversely decorated pyrroles, even in an aerobic fashion with air as the ideal oxidant.
Ruthenium-Catalyzed Pyrrole Synthesis via Oxidative Annulation of Enamides and Alkynes
作者:Bin Li、Nuancheng Wang、Yujie Liang、Shansheng Xu、Baiquan Wang
DOI:10.1021/ol303159h
日期:2013.1.4
An efficient and regioselective ruthenium-catalyzedoxidative annulation of enamides with alkynes via the cleavage of C(sp2)–H/N–H bonds is reported. The reactions can afford N-acetyl substituted or N-unsubstituted pyrroles by altering the reaction conditions slightly.
An efficient and regioselective cobalt-catalyzed synthesis of multi-substituted pyrroles is reported by the use of readily available enamides and alkynes. The success of the process relies on the employment of a catalytic amount of Cp*Co(CO)I2 together with CuO as the oxidant.
Synthesis of multi-substituted pyrroles using enamides and alkynes catalyzed by Pd(OAc)<sub>2</sub>with molecular oxygen as an oxidant
作者:Yun-He Xu、Tao He、Qiu-Chi Zhang、Teck-Peng Loh
DOI:10.1039/c3cc49683j
日期:——
A cyclization reaction between enamides and alkynes catalyzed by palladium(II) acetate is described. In this method, the molecular oxygen serves as an efficient oxidant for the Pd(II)/Pd(0) catalytic cycle. The simple reaction conditions permit this methodology to be used as a general tool for the preparation of multi-substituted pyrroles.
Preparation of substituted pyrroles via Ru(II)-catalyzed coupling of alkynes with enamides
作者:Kaliyappan Murugan、Shiuh-Tzung Liu
DOI:10.1016/j.tetlet.2013.03.013
日期:2013.5
An efficient ruthenium-catalyzed oxidative cyclization of enamides with alkynes in water or dimethoxyethane leading to the pyrrole derivatives is reported. Typically, a mixture of ethyl 2-(acetylamino)acrylate, diphenylacetylene, [Ru(p-cymene)Cl2] (2 mol %), KPF6, and Cu(OAc)2 in water was heated under refluxing conditions providing the N-acetylated pyrrole product in 95% yield.