Tandem RCM−Isomerization Approach to Glycals of Desoxyheptoses from a Common Precursor
摘要:
Ring closing metathesis and tandem RCM-isomerization have been applied to the synthesis of six- to eight-membered oxacycles, starting from a common precursor. The products of the tandem RCM-isomerization sequence are glycals of 3-deoxyheptoses of varying ring size.
Tandem RCM−Isomerization Approach to Glycals of Desoxyheptoses from a Common Precursor
摘要:
Ring closing metathesis and tandem RCM-isomerization have been applied to the synthesis of six- to eight-membered oxacycles, starting from a common precursor. The products of the tandem RCM-isomerization sequence are glycals of 3-deoxyheptoses of varying ring size.
Palladium-CatalyzedO-Allylation of α-Hydroxy Carbonyl Compounds
作者:Bernd Schmidt、Stefan Nave
DOI:10.1002/adsc.200505361
日期:2006.3
α-Hydroxy carbonyl compounds undergo smooth O-allylation using allylic carbonates and Pd(0) catalysts. This method has significant advantages over other O-allylation methods as it provides a solution to several problems previously observed for this synthetic transformation.
The first totalsynthesis of Cleistenolide, a novel natural product recently isolated from the Annonaceae species Cleistochlamys kirkii Oliver, is described. The synthesis proceeds in six steps and 18% overall yield, starting from an enantiopure C2-symmetric building block and using a Sharpless epoxidation, a selective epoxide opening, and a ring-closing metathesis reaction.