Aldehydes undergo smooth nucleophilic addition with allyltributylstannane in the presence of CeCl3·7H2O in acetonitrile under extremely mild reaction conditions to afford the corresponding homoallylicalcohols in excellent yields with high chemoselectivity. This method is very useful especially for the allylation of aldehydes bearing acid sensitive functionalities such as TBDMS, THP ethers, acetonides
The first synthesis of a 12-membered macrolide natural product via a RCM protocol: determination of absolute stereochemistry
作者:Palakodety Radha Krishna、Ravula Srinivas
DOI:10.1016/j.tetasy.2008.04.016
日期:2008.5
The first synthesis of (10S,12R)-10-hydroxy-12-methyl-1-oxacyclododecane-2,5-dione and its C12 epimer is reported, thereby assigning the absolute stereochemistry of the natural product. The strategy utilizes a syn selective reduction, Yamaguchi esterification, and ring-closing metathesis as the key steps. (C) 2008 Elsevier Ltd. All rights reserved.