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
Photolysis of Alkyl Aryl Sulfoxides: α-Cleavage, Hydrogen Abstraction, and Racemization<sup>1</sup>
作者:Yushen Guo、William S. Jenks
DOI:10.1021/jo961775m
日期:1997.2.1
The photochemistry of a series of alkyl aryl sulfoxides is described. The initial event of the photolysis process is homolytic cleavage to form sulfinyl/alkyl radical pairs. The radical pair partitions between recombination to starting material, formation of sulfenic esters, disproportionation to an olefin and benzenesulfenic acid, and formation of typical radical escape products. The quantum yield for conversion depends on the structure or the reactivity of the alkyl radical, with the sequence benzyl > tertiary alkyl > secondary alkyl > primary alkyl > (di)aryl. The high racemization efficiency of some aryl primary-alkyl sulfoxides suggests that another nonradical pathway for the photoracemization process may exist. Product analysis does not support any hydrogen abstraction pathways.
Sulfoxidation of alkenes and alkynes with NFSI as a radical initiator and selective oxidant
作者:Yuexia Zhang、Zeng Rong Wong、Xingxing Wu、Sherman J. L. Lauw、Xuan Huang、Richard D. Webster、Yonggui Robin Chi
DOI:10.1039/c6cc08631d
日期:——
Sulfoxides are important functional molecules. We develop a short-route (one-pot) synthesis of this class of molecules by reacting thiols with alkenes or alkynes under mild and metal-free conditions. N-fluorobenzenesulfonimide (NFSI)...