Microwave- and Photoirradiation-Induced Staudinger Reactions of Cyclic Imines and Ketenes Generated from α-Diazoketones. A Further Investigation into the Stereochemical Process
作者:Yong Liang、Lei Jiao、Shiwei Zhang、Jiaxi Xu
DOI:10.1021/jo048328o
日期:2005.1.1
with a series of acyclic and cyclicimines were investigated under both microwave and photoirradiation conditions. The results indicate that the zwitterionic azabutadiene-type intermediates yielded from imines and ketenes undergo a conrotatory ring closure exclusively to produce β-lactams. It is notable that no Woodward−Hoffmann product was found under the ultraviolet irradiation. The photoirradiation-induced