Convenient synthesis of .alpha.-heterosubstituted acyloxathianes
作者:Xu Bai、Ernest L. Eliel
DOI:10.1021/jo00045a031
日期:1992.9
In contrast to simple esters, alpha-alkoxy, alpha-alkylthio, and alpha-dimethylamino esters react with lithiooxathiane 1-Li in good yield to give the corresponding alpha-functionalized 2-acetylhexahydro-4,4,7-trimethyl-4H-1,3-benzoxathiin 2. In some cases, mixtures of diastereomers (2, 2') are obtained. The reaction has been extended to alpha-methoxy- and alpha-[(triisopropylsilyl)oxy]propanoyl and alpha-(methylthio)butanoyl homologs which have chiral centers at C(alpha).
Diastereoselective silylene transfer reactions to chiral enantiopure alkenes: effects of ligand size and substrate bias
作者:Christina Z. Rotsides、K. A. Woerpel
DOI:10.1039/c6dt04612f
日期:——
the stereoselective construction of compounds containing carbon–silicon bonds. Despite their synthetic utility, the development of either an enantioselective or diastereoselective metal-catalyzed silylene transfer reaction, in which ligands on the metal catalyst control stereoselectivity, has not been achieved. In this article, we report that the structure of the alkene is the most important for controlling