Stereoselective synthesis of pyrrolizidine alkaloids via substituted nitrones
作者:David Lathbury、Timothy Gallagher
DOI:10.1039/c39860001017
日期:——
The 3,5-disubstituted pyrrolizidinealkaloid (8) has been synthesised using, as a key step, the cyclisation of the allenic oxime E-(3) to generate a 5-substituted nitrone (4); under the same cyclisation conditions Z-(3) reacts via oxygen to give (9).