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,
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。
Alkyl Sulfides as Promising Sulfur Sources: Metal-Free Synthesis of Aryl Alkyl Sulfides and Dialkyl Sulfides by Transalkylation of Simple Sulfides with Alkyl Halides
A site‐selective metal‐free dealkylative approach to synthesize aryl alkyl and symmetrical dialkyl sulfides has been developed. This procedure is convenient and has wide functional group tolerance giving rise to sulfides carrying various alkyl chains from simple alkyl sulfides and alkyl halides in good to excellent yields. This transalkylation proceeds by an ionic mechanism via sulfonium intermediates
The relative benzylic deprotonation rate constants of aryl–benzyl sulfides have been measured and the obtained values were compared with the substituent constants using the Hammett equation and with deprotonation Gibbs energies calculated on B3LYP/aug-cc-pVDZ level. The deprotonation rate depends on the stabilization of the negative charge, which is spread over the benzene ring. The series of brominated