Base‐Mediated Radical Borylation of Alkyl Sulfones
作者:Mingming Huang、Jiefeng Hu、Ivo Krummenacher、Alexandra Friedrich、Holger Braunschweig、Stephen A. Westcott、Udo Radius、Todd B. Marder
DOI:10.1002/chem.202103866
日期:2022.1.13
The utilization of inactivated alkyl sulfones as alkylradical precursors in a base-mediated borylation reaction with B2neop2 is reported, allowing direct access to valuable alkyl boronate esters without further transesterification. This approach is scalable and is tolerant to a variety of functional groups and substrates including complex molecules.
据报道,在与 B 2 neop 2的碱介导的硼基化反应中,利用失活的烷基砜作为烷基自由基前体,从而无需进一步酯交换即可直接获得有价值的烷基硼酸酯。这种方法具有可扩展性,并且能够耐受各种官能团和底物,包括复杂分子。
LEWIS ACID-PROMOTED REACTION OF 2-ALKOXY-3,5-DINITROPYRIDINES WITH THIOLS. A NEW METHOD FOR THE SYNTHESIS OF UNSYMMETRICAL SULFIDES
作者:Teruaki Mukaiyama、Takashi Masui、Toshio Izawa
DOI:10.1246/cl.1976.1177
日期:1976.11.5
2-Alkoxy-3,5-dinitropyridines, easily prepared from 2-fluoro-3,5-dinitropyridine and alcohols react with various thiols in the presence of Lewis acids to give the corresponding unsymmetrical sulfides in good yields.
One-electron chemical reductions of phenylalkylsulfonium salts
作者:Peter Beak、Thomas A. Sullivan
DOI:10.1021/ja00380a020
日期:1982.8
Desulfurization with nickel and cobalt boride: scope, selectivity, stereochemistry, and deuterium-labeling studies
作者:Thomas G. Back、Denise L. Baron、Kexin Yang
DOI:10.1021/jo00061a011
日期:1993.4
A variety of organosulfur compounds containing alkylthio and arylthio groups underwent reductive desulfurization under notably mild conditions when treated with nickel boride, generated in situ from nickel chloride hexahydrate and sodium borohydride in methanol-THF(3:1). Phenyl,chloro, and ester groups are not reduced under these conditions, while iodo, bromo, nitrile, aldehyde, ketone, cyclopropane, and olefinic functions are reduced either completely or partially. Deuterium-labeling studies indicate that the hydrogen that is incorporated into the product originates from both the sodium borohydride and the protic solvent, suggesting the intermediacy of dihydrogen. The epimers 3alpha- and 3beta-(phenylthio)cholestane afforded 3alpha- and 3beta-deuteriocholestane, respectively, demonstrating that the reaction proceeds with retention of configuration. The method may thus be employed for the stereospecific preparation of deuterated products from organosulfur compounds. Arguments are presented in support of a tentative mechanism involving an oxidative addition-reductive elimination sequence via a nickel hydride intermediate.
Lewis acid-induced nucleophilic substitution reaction of .beta.-nitro sulfides
作者:Akio Kamimura、Hiroyuki Sasatani、Toshihiro Hashimoto、Noboru Ono