An efficient asymmetric oxidation of sulfides to sulfoxides
作者:P. Pitchen、E. Dunach、M. N. Deshmukh、H. B. Kagan
DOI:10.1021/ja00338a030
日期:1984.12
Mise au point d'un nouveau reactif: Ti(O-i-C 3 H 7 ) 4 /tartrate de diethyle/eau/t-C 4 H 9 OOH dans les proportions (1:2:1:1). Ce reactif oxyde les sulfures fonctionnalises prochiraux en sulfoxydes optiquement actifs
Mise au point d'un nouveau 反应:Ti(OiC 3 H 7 ) 4 /二乙基酒石酸盐/eau/tC 4 H 9 OOH dans les 比例(1:2:1:1)。氧化硫反应功能
A Facile and Selective Procedure for Oxidation of Sulfides to Sulfoxides on Silica Gel Supported Magnesium Monoperoxyphthalate (MMPP) in Dichloromethane
作者:Mohammed Hashmat Ali、William C. Stevens
DOI:10.1055/s-1997-1420
日期:1997.7
The scope of the magnesium monoperoxyphthalate (MMPP) oxidation of sulfides to sulfoxides has been extended by using hydrated silica gel as a solid support in dichloromethane media. This procedure works in the presence of a number of functional groups on the sulfides, including carbonyl and alkene groups that have been known to undergo Baeyer-Villiger oxidation and epoxidation with MMPP when using more conventional procedures. To our knowledge, this is the first example of oxidation of sulfides containing a carbonyl group with MMPP in non-aqueous media without any Baeyer-Villiger reaction. The reported procedure is easy to perform, product separation is trivial and it produces excellent yields.
Acid-catalyzed reduction of various cyclic sulfoxides with iodide ion were kinetically investigated. The rates of reduction of thianthrene, phenoxathiin, dibenzothiophene oxides were found to be in a linear relation with their basicities, while those of alicyclic sulfoxides fall in the following sequence with a 700 fold range; 5->4->open>7->6- membered cyclic sulfoxides. This rate sequence seems to
Oxidation of Sulfides with Pyridinium Tribromide in the Presence of Hydrated Silica Gel
作者:Mohammed Hashmat Ali、Susan Stricklin
DOI:10.1080/00397910600619044
日期:2006.7
Abstract A variety of sulfides have been oxidized to sulfoxides utilizing pyridinium tribromide in the presence of hydrated silica gel in a non‐aqueous media. A combination of pyridinium tribromide and hydrated silica gel releases molecular bromine slowly in the reaction, affecting the oxidation. Hydrated silica gel also promotes decomposition of the bromosulfonium intermediate to the product. This
Abstract An efficient and highly selective procedure for oxidation of sulfides to sulfoxides with N‐bromosuccinimide (NBS) in the presence of hydrated silica gel has been developed. Hydrated silica gel supplies the water necessary for decomposition of the intermediate bromosulfonium salt to the product, allowing the reaction to employ a nonaqueous media. Also, this procedure has increased the scope