Rhodium-catalyzed synthesis of γ-butyrolactams and pyrrolidines via cycloisomerization of N-tethered 1,6-enynes
摘要:
A rhodium-catalyzed cycloisomerization reaction of N-tethered 1,6-enynes with an intramolecular halogen shift has been developed, providing a useful process for the synthesis of stereo defined gamma-butyrolactam and pyrrolidine derivatives in good to excellent yields. Effects of both electronic feature and steric structure of the substrates on the outcome of the reaction were investigated. (C) 2010 Elsevier Ltd. All rights reserved.
A palldium(0)-catalyzed tandem cyclization/Suzuki coupling reaction of various 1,6-enyne substrates was developed. This Pd-catalyzed enyne cyclization reaction represents a new process for the synthesis of stereodefined α-arylmethylene-γ-butyrolactones, lactams, multifunctional tetrahydrofurans, pyrrolidines, and cyclopentanes. The mechanism of the reaction was studied by the employment of different
Palladium-Catalyzed Tandem Cyclization/Suzuki Coupling of 1,6-Enynes
作者:Gangguo Zhu、Zhaoguo Zhang
DOI:10.1021/ol035304f
日期:2003.10.1
[reaction: see text] A Pd(0)-catalyzed 1,6-enyne cyclization-arylation cascade reaction was effected via pi-allylpalladium intermediate formation and subsequent Suzuki coupling to give cyclic products with stereodefined exocyclic double bonds.