Chiral cyclic imides with c2-symmetry. Novel reagents for the synthesis of optically pure lactones containing three contiguous tertiary centers
作者:Hidemi Yoda、Koji Shirakawa、Kunihiko Takabe
DOI:10.1016/s0040-4039(00)92719-9
日期:1991.7
Asymmetric reactions employing C2-symmetrical imides readily prepared from L-tartaric acid with Grignard reagents and sodium borohydride afforded a separable mixture of two hydroxyamides with high diastereoselectivity. Products were lactonized respectively to provide optically pure γ- alkylated lactones with contiguous tertiary carbon centers. The reaction mechanisms in asymmetric induction were also