Hydrogenation of pyrrolizin-3-ones; new routes to pyrrolizidines
作者:Xavier L. M. Despinoy、Hamish McNab
DOI:10.1039/b910199c
日期:——
catalysts. Good diastereoselectivity (up to >97:3, depending on catalysts and solvent) can be achieved if the pyrrolizin-3-one is substituted at the 1- (or 7-) position(s), but the selectivity is reduced if both positions are substituted. Subsequent deoxygenation of the pyrrolizidin-3-ones provides concise, diastereoselectiveroutes to the necine bases (±)-heliotridane 5, (±)-isoretronecanol 6 and (±)retronecanol