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