Selenosulfonation of acetylenes: preparation of novel .beta.-(phenylseleno)vinyl sulfones and their conversion to acetylenic and .beta.-functionalized sulfones
A copper-catalyzedhighlyregio- and stereospecific selenosulfonation of alkynes with arylsulfonohydrazides and diphenyl diselenide has been developed. This novel three component reaction proceeds under very mild conditions and with a broad scope of substrates, providing a wide range of (E)-β-selenovinyl sulfones in good to excellent yields.
Synthesis of (<i>E</i>)-β-Selenovinyl Sulfones through a Multicomponent Regio- and Stereospecific Selenosulfonation of Alkynes with Insertion of Sulfur Dioxide
A novel and practical method for the selenosulfonation of alkynes with the insertion of sulfur dioxide has been developed. A series of beta-(seleno)vinyl sulfones with high levels of regio- and stereoselectivity have been prepared. The key features of this reaction include a broad substrate scope, excellent functional-group tolerance, and amenability to scale-up synthesis. A plausible radical mechanism is proposed to illustrate this reaction.
Substitution reactions of organocuprates with .beta.-(phenylseleno)vinyl sulfones derived from the selenosulfonation of acetylenes. A convenient and stereospecific preparation of vinyl sulfones and olefins from acetylenes
作者:Thomas G. Back、Scott Collins、M. Vijaya Krishna、Kwok Wai Law
DOI:10.1021/jo00228a019
日期:1987.9
BACK, T. G.;COLLINS, S.;KERR, R. G., J. ORG. CHEM., 1983, 48, N 18, 3077-3084