4-Substituted protoanemonin in intramolecular cycloaddition reactions of non-stabilised azomethine ylides
作者:Ronald Grigg、Vladimir Savic、Mark Thornton-Pett
DOI:10.1016/s0040-4020(97)00674-1
日期:1997.7
The intramolecular cycloaddition reactions of non-stabilised azomethine ylides generated by condensation of 4-(3-propanalyl)-5-methylene-2(5H)furanone and cyclic amino acids were investigated. The reactions proceeded via highly stereoselective formation of anti- dipoles followed by cycloaddition reactions on either the α,β- or γ,δ- double bond to produce polycyclic cycloadducts in good yield. Both
研究了由4-(3-丙炔基)-5-亚甲基-2(5H)呋喃酮与环状氨基酸缩合生成的非稳定的甲亚胺烷基化物的分子内环加成反应。反应通过高度立体选择性地形成反偶极子,然后在α,β-或γ,δ-双键上进行环加成反应来进行,从而以高收率生产多环环加合物。内酯部分的两个双键被证明是有效的双亲性。