A novel class of azatricyclononanes: pentasubstituted cyclopropanes from an uncatalysed reaction
作者:Lawrence Harris、Martin Gilpin、Amber L. Thompson、Andrew R. Cowley、Mark G. Moloney
DOI:10.1016/j.tetasy.2009.02.037
日期:2009.5
The direct and versatile stereoselective synthesis of a novel class of cyclopropyl derivatives of pyroglutamic acid is reported, using substituted diaryldiazo compounds. The course of the reaction has been investigated, and yields of substituted fluorenylcyclopropanes are greater than those of diphenylmethyl-cyclopropane analogues. (C) 2009 Elsevier Ltd. All rights reserved.
Uncatalysed diaryldiazo cyclopropanations on bicyclic lactams: access to annulated prolines
作者:Lawrence Harris、Martin Gilpin、Amber L. Thompson、Andrew R. Cowley、Mark G. Moloney
DOI:10.1039/c5ob00648a
日期:——
cycloaddition of substituted diaryldiazo compounds onto bicyclic unsaturated lactams derived from pyroglutamic acid efficiently leads to highly functionalised azatricyclononanes. The products are readily elaborated to deprotected pyroglutamate derivatives, providing rapidaccess to conformationally constrained amino acids and their analogues. Preliminary assessment of antibacterial activity against