A versatile approach to cis-5-substituted 4-hydroxy-2-pyrrolidinones: asymmetric synthesis of angiogenesis inhibitor streptopyrrolidine
摘要:
A concise, flexible, and highly diastereoselective approach to cis-5-alkyl-4-hydroxy-2-pyrrolidinones 1 is described. The key step is an ammonium acetate-assisted catalytic hydrogenation of the enamides 9, derived in two steps from malimides 6a,b as we have described previously. The method was applied to the asymmetric synthesis of streptopyrrolidine 5, a natural product, which exhibited significant anti-angiogenesis activity. (C) 2009 Elsevier Ltd. All rights reserved.
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.
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
A versatile approach to cis-5-substituted 4-hydroxy-2-pyrrolidinones: asymmetric synthesis of angiogenesis inhibitor streptopyrrolidine
作者:Shao-Hua Xiang、Hong-Qiu Yuan、Pei-Qiang Huang
DOI:10.1016/j.tetasy.2009.08.018
日期:2009.9
A concise, flexible, and highly diastereoselective approach to cis-5-alkyl-4-hydroxy-2-pyrrolidinones 1 is described. The key step is an ammonium acetate-assisted catalytic hydrogenation of the enamides 9, derived in two steps from malimides 6a,b as we have described previously. The method was applied to the asymmetric synthesis of streptopyrrolidine 5, a natural product, which exhibited significant anti-angiogenesis activity. (C) 2009 Elsevier Ltd. All rights reserved.