Highly diastereoselective formation of bicyclic compounds by intramolecular cycloaddition of chiral thiaalkenyl nitrones
作者:Hans Günter Aurich、Jose-Luis Ruiz Quintero
DOI:10.1016/s0040-4020(01)89668-x
日期:1994.3
Starting from chiral mercapto alcohols 5 in several reaction steps nitrones 7 were formed which underwent spontaneously intramolecular cycloaddition to give diastereomerically pure products 8. However, during the reaction course partial racemization had occurred. In contrast, nitrones 9 in which the chiral center is adjacent to the nitrogen atom afforded a mixture of the two diastereomeric cycloadducts