Pd(II)-Catalyzed Tandem Heterocyclization of 1-(1-Alkynyl)cyclopropyl Oxime Derivatives for the Synthesis of Functionalized Pyrroles
作者:Dong Pan、Yin Wei、Min Shi
DOI:10.1021/acs.orglett.6b02068
日期:2016.8.5
An efficient approach for the synthesis of highly functionalized pyrroles has been developed by a Pd(TFA)2-catalyzed tandem heterocyclization of 1-(1-alkynyl)cyclopropyl oxime derivatives under mild conditions. The reaction first proceeded via an intramolecular nucleophilic attack followed by a ring-opening process and then intermolecular nucleophilic attack as well as protonation to afford the desired
Catalyst-Dependent Divergent Synthesis of Pyrroles from 3-Alkynyl Imine Derivatives: A Noncarbonylative and Carbonylative Approach
作者:Gen-Qiang Chen、Xiao-Nan Zhang、Yin Wei、Xiang-Ying Tang、Min Shi
DOI:10.1002/anie.201405215
日期:2014.8.4
A novel Ru0‐ and RhI‐catalyzed noncarbonylative and carbonylative cycloisomerization of readily available 3‐alkynylimine derivatives has been developed to provide 3,4‐fused or nonfused pyrrole derivatives efficiently in moderate to excellent yields. The key steps involve the formation of a ruthenium carbenoid intermediate or a rhodacycle intermediate, respectively. In these reactions, CO can serve
Rhodium-catalyzed tandem Pauson–Khand type reactions of 1,4-enynes tethered by a cyclopropyl group
作者:Gen-Qiang Chen、Min Shi
DOI:10.1039/c2cc37587g
日期:——
The tandem PausonâKhand type reactions of 1,4-enynes tethered by a cyclopropyl group with two molecules of CO proceed smoothly in the presence of [Rh(CO)2Cl]2 under a CO atmosphere to give the corresponding 6-hydroxy-2,3-dihydro-1H-inden-1-one derivatives in moderate yields under mild conditions.
在 CO 气氛下,[Rh(CO)2Cl]2 存在时,1,4-烯炔与两个 CO 分子的串联 PausonâKhand 型反应顺利进行,并在温和条件下以中等产率得到相应的 6-羟基-2,3-二氢-1H-茚-1-酮衍生物。
Gold-Catalyzed Oxidative Cyclizations on 1,4-Enynes: Evidence for a γ-Substituent Effect on Wagner-Meerwein Rearrangements
作者:Satish Ghorpade、Ming-Der Su、Rai-Shung Liu
DOI:10.1002/anie.201210313
日期:2013.4.8
Gold‐catalyzed oxidative cyclizations of 1,4‐enynes were used to study the γ‐effect on the Wagner–Meerwein rearrangement. Both experimental and theoretical work disclose that a gold substituent in the γ‐position can direct a stereospecific 1,2‐shift of the anti‐β‐substituent regardless of its intrinsic properties.