Stereoselective Synthesis of Polyfunctional Tetrasubstituted Alkenyl Sulfides via a Carbocupration of Alkynyl Sulfides with Aryl and Benzylic Diorganozincs
Stereoselective Synthesis of Polyfunctional Tetrasubstituted Alkenyl Sulfides via a Carbocupration of Alkynyl Sulfides with Aryl and Benzylic Diorganozincs
The First Broad Application of Alkynyl Sulfides as Dienophiles in Cobalt(I)-Catalyzed Diels−Alder Reactions
作者:Gerhard Hilt、Steffen Lüers、Klaus Harms
DOI:10.1021/jo0302915
日期:2004.2.1
The cobalt(I)-catalyzed Diels−Alder reaction of nonactivated aryl alkynyl sulfides with acyclic 1,3-dienes generates dihydroaromatic vinyl sulfides under very mild reaction conditions, and these products can be oxidized with mild oxidants to the corresponding diaryl sulfides in good overall yields. The steric and electronic effects of substituents on the aryl, as well as on the alkynyl, moieties of
Stereoselective Synthesis of Polyfunctional Tetrasubstituted Alkenyl Sulfides via a Carbocupration of Alkynyl Sulfides with Aryl and Benzylic Diorganozincs
A general method for the synthesis of tetrasubstituted alkenyl sulfides has been developed by the carbocupration of alkynyl sulfides with functionalized diorganozinc reagents in the presence of CuCNË2LiCl. The intermediate alkenylcopper reagents readily react with various electrophiles furnishing a broad range of highly functionalized alkenes with excellent stereoselectivity (E/Z 93:7-99:1).