Camphorquinone: a new and efficient oxidant for the preparation of 2-thio-substituted benzothiazoles from alcohols by oxidation-reduction condensation
摘要:
A convenient one-pot procedure for the preparation of various 2-thio-substituted benzothiazoles from alcohols and benzothiazole-2-thiol utilizing camphorquinone-mediated oxidation-reduction condensation is disclosed. The condensation between benzothiazole-2-thiol and alkyl diphenylphosphinites, generated in situ from alcohols and chlorodiphenylphosphine, proceeded smoothly in the presence of camphorquinone to furnish the corresponding benzothiazoles in good to moderate yields.[GRAPHICS].
Longchained and SO3H‐functionalized ionic liquids derived from pyrrolidine were employed as metal‐free, efficient and recyclable catalyst for thiolation of alcohols with several kinds of thiols, providing up to 99 % yield within 0.25 h at room temperature.
Direct Synthesis of Thioethers from Carboxylates and Thiols Catalyzed by FeCl<sub>3</sub>
作者:Kunuru Venkatesham、Chitturi Bhujanga Rao、Chanti Babu Dokuburra、Richard A. Bunce、Yenamandra Venkateswarlu
DOI:10.1021/acs.joc.5b02143
日期:2015.11.20
A new and efficient method has been developed for the synthesis of thioethers from carboxylates and thiols. The reaction proceeds via a Fe(III)-catalyzed direct displacement of carboxylates from benzylic or allylic esters by heterocyclic thiols. Short reaction times, good to excellent yields of products, and few side reactions are the significant features of the new protocol.
Acidic-functionalized ionic liquid as an efficient, green, and metal-free catalyst for benzylation of sulfur, nitrogen, and carbon nucleophiles to benzylic alcohols
作者:Xue-Qiang Chu、Ran Jiang、Yi Fang、Zheng-Yang Gu、Hua Meng、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1016/j.tet.2012.11.045
日期:2013.1
A series of HSO4- functionalized ILs was synthesized and used as efficient, green, and metal-free catalysts for benzylation. Notably, the catalytic system has wide substrate scopes and the ionic liquid catalysts were applied to investigate three different types of nucleophiles to give the desired benzylation products with moderate to excellent yields. (C) 2012 Elsevier Ltd. All rights reserved.