A Versatile Approach to Protected (4<i>S</i>,5<i>R</i>)-4-Hydroxy-5-(α-hydroxyalkyl)-2-pyrrolidinones
作者:Pei-Qiang Huang、Xiang Zhou
DOI:10.1055/s-2006-939695
日期:——
Starting from (S)-N,O-dibenzylmalimide (7), a versatile four-step approach to (4S,5R)-N-benzyl-4-benzyloxy-5-(α-hy-droxyalkyl)-2-pyrrolidinones 9 is reported. The method consists of Grignard reagent addition, p-toluenesulfonic acid monohydrate-mediated dehydration, one-pot epoxidation-methanol ring-opening reaction and reductive demethoxylation. 2-Pyrrolidinones 9 were obtained with excellent tran
Complementary Stereocontrolled Approaches to 2-Pyrrolidinones Bearing a Vicinal Amino Diol Subunit with Three Continuous Chiral Centers: A Formal Asymmetric Synthesis of (−)-Detoxinine
first approach consists of an epoxidation−reductive dehydroxylation procedure, and the second one is based on hydroboration−oxidation reactions. Using the second method, a formal asymmetric synthesis of (−)-detoxinine was achieved.