letter reports the preparation of quinolines, substituted at the 2- or 3-position by a 4-substituted but-3-en-1-yne group, by the environmentally friendly iron(III)-catalyzed coupling reaction of Grignardreagents with 1-chloro-4-(2-quinolyl)but-1-en-3-yne. The extension and the scope of this non-toxic and chemoselective procedure to various functionalized unsaturated vinyl chlorides are described.
An Iterative Procedure for the Synthesis of Conjugated ψ-Chlorotrienoic and -tetraenoic Esters and Related Derivatives
作者:Margarita Mladenova、Maya Tavlinova、Momcho Momchev、Mouâd Alami、Michèle Ourévitch、Jean Daniel Brion
DOI:10.1002/ejoc.200300110
日期:2003.7
An iterative stereoselective procedure for the synthesis of isomers of conjugated ψ-chlorotrienoic esters and ψ-chlorotetraenoic esters as well as related conjugated ψ-chloropolyenynoic esters is described, using readily available conjugated chlorodienol and chloroenynol derivatives as starting materials. The two-step sequence studied is based on repetition of a one-pot conjugated allylic alcohol oxidation/Wittig
Horner―Wadsworth―Emmons reaction of stannylvinylphosphonates with aldehydes and mild thermal cyclisation provides disubstituted arylstannanes. Subsequent Stille coupling leads to regiospecificsynthesis of m- and p-terphenyls.