Reactions of 1,2-dehydropyrrolidin-5-one with 1,3-dienes. Synthesis of <i>dl</i>-gephyrotoxin 223AB
作者:Oliver E. Edwards、Austin M. Greaves、Wing-Wah Sy
DOI:10.1139/v88-191
日期:1988.5.1
Evidence is presented that the regiospecific and often stereospecific pseudo-Diels–Alder reactions of 1,3-dienes with N-acyl immonium salts, derived from 5-ethoxy-2-pyrrolidinone, are stepwise reactions. 6,7-Dehydroindolizidinones, unsaturated lactam esters, and new indene and furan derivatives are described. A synthesis of dl-gephyrotoxin 223AB (indolizidine 223AB) from trans-1,3-heptadiene was achieved