Visible-light-activated selective synthesis of sulfoxides via thiol-ene/oxidation reaction cascade
作者:Manjula Singh、Arvind K. Yadav、Lal Dhar S. Yadav、R.K.P. Singh
DOI:10.1016/j.tetlet.2017.12.066
日期:2018.1
A convenient, highly selective and metal-free synthesis of sulfoxides from alkenes and thiols using NHPI as an inexpensive and reusable organophotoredox catalyst is reported. The protocol involves radical thiol-ene/oxidation reaction cascade and utilizes visiblelight and air (O2) as inexpensive, readily available, non-toxic and eco-sustainable reagents to afford up to 96% yields of the product at
Acid-Catalyzed Oxidative Addition of Thiols to Olefins and Alkynes for a One-Pot Entry to Sulfoxides
作者:Martin Klussmann、Hui-Lan Yue
DOI:10.1055/s-0035-1562480
日期:——
An oxidative variant of the thiol-ene reaction has been developed, achieving the direct addition of thiols to olefins to form sulfoxides. The reaction uses tert-butyl hydroperoxide as oxidant and methanesulfonic acid as catalyst. The latter is believed to catalyze the oxidation of the intermediate sulfide to the sulfoxide. No special precautions are necessary to exclude oxygen, yet the products are
Stereoselective conjugate additions of sulphoxide stabilised carbanions to α,β-unsaturated esters
作者:M. Casey、A.C. Manage、L. Nezhat
DOI:10.1016/s0040-4039(00)82202-9
日期:1988.1
The reaction of lithiated alkyl t-butyl sulphoxides with α,β-unsaturated esters gives conjugateaddition products in good yield, with high stereoselectivity.
A general route to enantiomerically pure sulfoxides from a chiral sulfite
作者:F. Rebiere、O. Samuel、L. Ricard、H. B. Kagan
DOI:10.1021/jo00021a008
日期:1991.10
Enantiomerically pure cyclic chiral sulfite (S)-7 (trans stereochemistry) has been easily obtained in two steps from (S)-ethyl lactate. This compound was found to react cleanly with many organometallics to give crystalline sulfinates with high regioselectivity (> 90:10). Addition of a second organometallic transforms the purified sulfinate in excellent yield into a chiral sulfoxide (100% ee) of predictable absolute configuration. The mechanism and scope of this approach are discussed. This method completes the various other methods of preparation of chiral sulfoxides and is especially convenient for the preparation of tert-butyl sulfoxides. Examples for the synthesis of many chiral tert-butyl sulfoxides are given. The case of chiral sulfites derived from a C2 diol or of a chiral monoalcohol is also proposed as a route to chiral sulfinates, and some promising preliminary results have been obtained. The general main routes to obtain chiral sulfoxides from sulfites are also discussed.