An efficient asymmetric synthesis of nitroolefinic lactones with chiral nitroenamines possessing bulky chiral leaving groups
作者:Xiaowu Yang、Rui Wang
DOI:10.1016/s0957-4166(97)00452-7
日期:1997.10
An efficient asymmetric nitroolefination of enolates 4a-c, 5 afforded multifunctional group nitroolefinic lactones 7a-e and 8a,b containing stereogenic quaternary carbon centers using bulky chiral nitroenamines 1a,b–3a,b as chiral auxiliaries. Studies on the effect of the bulkiness of leavinggroup showed that bulky nitroenamines 1a,b gave higher ees and yields than those of the less bulky 2a,b–3a