Asymmetric synthesis of syn 1,2-diols via the reaction of aldehydes with chiral .gamma.-(tetrahydropyranyloxy)allylstannanes
摘要:
Asymmetric synthesis of syn 1,2-diols 3 has been accomplished via the reaction of the chiral gamma-alkoxy-substituted allylstannane 1 with aldehydes in the presence of AlCl3 or AlCl3.OEt2, followed by a five-step operation to remove the chiral auxiliary.
Enantio- and Diastereocontrolled Total Synthesis of (+)-Boronolide
作者:Pradeep Kumar、S. Vasudeva Naidu
DOI:10.1021/jo0603781
日期:2006.5.1
An efficient stereoselective totalsynthesis of (+)-boronolide from valeraldehyde is described. The key steps include a Sharpless asymmetric hydroxylation, a chelation-controlled vinyl Grignard reaction followed by a Sharpless asymmetric epoxidation, hydrolytic kinetic resolution, and a ring-closing metathesis.
A seteroselective total synthesis of (+)-boronolide is described. The key steps are Sharpless asymmetric dihydroxylation, Shibasaki's asymmetric Henry reaction, asymmetric allylation and ring closing metathesis. (c) 2005 Elsevier Ltd. All rights reserved.