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.
Addition of phenyl areneselenosulphonates to acetylenes:a route to acetylenic sulphones
作者:Takashi Miura、Michio Kobayashi
DOI:10.1039/c39820000438
日期:——
Treatment of phenyl areneselenosulplonates (1) with terminal acetylenes resulted in the formation of β-(phenylseleno)vinyl sulphones (2), which on treatment with excess of hydrogen peroxide in tetrahydrofuran at room temperature gave acetylenicsulphones (3) in good 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.
MIURA, TAKASHI;KOBAYASHI, MICHIO, J. CHEM. SOC. CHEM. COMMUN., 1982, N 8, 438-439