Nanolayered cobalt–molybdenum sulphides (Co–Mo–S) catalyse borrowing hydrogen C–S bond formation reactions of thiols or H<sub>2</sub>S with alcohols
作者:Iván Sorribes、Avelino Corma
DOI:10.1039/c8sc05782f
日期:——
Nanolayered cobalt–molybdenum sulphide (Co–Mo–S) materials have been established as excellent catalysts for C–S bond construction. These catalysts allow for the preparation of a broad range of thioethers in good to excellent yields from structurally diverse thiols and readily available primary as well as secondary alcohols. Chemoselectivity in the presence of sensitive groups such as double bonds,
Primary alcohols are converted into dialkyl disulfides via heating in situ generated O-alkyl S-difluoro(ethoxycarbonyl)methyl xanthates from ethyl bromodifluoroacetate and potassium xanthates, prepared from primary alcohols and carbon disulfide in the presence of KOH. The reaction mechanism is suggested as an alkyl C[1,3] shift followed by a radical mechanism. This extends to the Chugaev elimination
A photo-oxidative homo-coupling of thiol was promoted by BrCCl3 in THF. This catalyst- and metal-free method was used to synthesize disulfides under mild conditions. The clean reaction minimized the possibility of contamination of the product.
N‐Heterocyclic Carbene Mediated Sulfur Extrusion of Disulfides
作者:Alexander P. Galow、Frank Rominger、Michael Mastalerz
DOI:10.1002/ejoc.202201383
日期:2023.2.13
N-heterocyclic carbenes can be used to substitute the highly carcinogenic aminophosphines to extrude sulfur from disulfides from thioethers (here R=aryl). Furthermore, pharmaceutically more interesting compounds such as cystine can be transformed to lanthionine.
N-杂环卡宾可用于替代高度致癌的氨基膦,以从硫醚(此处 R = 芳基)的二硫化物中挤出硫。此外,药学上更有趣的化合物如胱氨酸可以转化为羊毛硫氨酸。
An efficient metal-free synthesis of organic disulfides from thiocyanates using poly-ionic resin hydroxide in aqueous medium
作者:Debasish Sengupta、Basudeb Basu
DOI:10.1016/j.tetlet.2013.02.070
日期:2013.5
An efficient and metal-free method is described for the preparation of organic disulfides from alkyl and acyl methyl thiocyanates in the presence of poly-ionic resin hydroxide in aqueous medium. Further extension of this protocol has been tested using two different organyl thiocyanates to prepare unsymmetrical disulfides. (C) 2013 Elsevier Ltd. All rights reserved.