名称:
Asymmetric 1,4 addition of grignard reagents to chiral α,β-unsaturated imides in the presence of lewis acids
摘要:
The asymmetric 1,4 addition of PhMgCl, MeMgBr and ally1MgBr to chiral imides 1 has been studied under various conditions. The presence of a Lewis acid, as AlMe(2)Cl, affords an enhanced diastereoselectivity favouring the formation of the product derived from the attack on the re face. The 1,4 addition of allyl diisopropoxyborate to imides 1 has also been analysed. Copyright (C) 1996 Elsevier Science Ltd