Metal-free photo-induced radical C-P and C-S bond formation for the synthesis of 2-phosphoryl benzothiazoles
摘要:
We reveal here a visible-light promoted phosphorylation of 2-isocyanoaryl thioethers for the first time with concomitant C(sp(3))-S bond cleavage and imidoyl C-S formation. Additionally, this method features the use of 3 mol% organic dye Rose Bengal as the photocatalyst without external transition-metal or peroxide oxidants, and provides a novel and environmentally friendly approach for the preparation of a variety of 2-phosphoryl benzothiazoles in moderate to good yields. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
cascade radicalC(sp2/sp3)-S bond cleavage and group-transfer cyclization is disclosed. Triggered by alkyl radicals, varieties of 2-isocyanoaryl thioethers containing aliphatic, aryl, and heteroaromatic groups can be cleaved and precisely reinstalled to give benzothiazole derivatives. Mechanistic studies reveal that the cascade reaction undertakes an intermolecular pathway, and the inner radical sources
An Efficient Copper-Catalyzed Cross-Coupling Reaction of Thiols with Aryl Iodides
作者:Hsin-Lun Kao、Chin-Keng Chen、Yu-Jen Wang、Chin-Fa Lee
DOI:10.1002/ejoc.201001667
日期:2011.3
Cu 2 O powder is a very reactive catalyst for the coupling of thiols to aryl iodides. A variety of functional groups including esters, unprotected amines, alcohols, and heterocycles tolerate the reaction conditions. Moreover, di-ortho-substituted aryl iodides with sterically demanding substrates were also coupled to give the desired aryl thioethers in good to excellent yields.
市售的 Cu 2 O 粉末是一种非常活泼的催化剂,用于将硫醇偶联到芳基碘化物上。包括酯、未保护胺、醇和杂环在内的多种官能团可耐受反应条件。此外,二邻位取代的芳基碘化物与空间要求严格的底物也被偶联,以良好至极好的产率得到所需的芳基硫醚。
Sulfonanilide compounds
申请人:Taisho Pharmaceutical Co., Ltd.
公开号:US04885367A1
公开(公告)日:1989-12-05
Sulfonanilide compounds represented by the formula ##STR1## wherein R.sup.1 is a lower alkyl group or a trifluoromethyl group, R.sup.2 is a cycloalkylidenemethyl group, a group of the formula --A--R.sup.3 (wherein A is an oxygen atom, a sulfur atom, a sulfynyl group or a sulfinyl group and R.sup.3 is a cycloalkyl group having 5-8 carbon atoms; a cycloalkyl group having 5-8 carbon atoms substituted by one or two of a lower alkyl group, an oxo group, a hydroxyl group or a methanesulfonyloxy group, a tetrahydropyranyl group; a tetrahydrothiopyranyl group; or a 1-methyl-piperidyl group) or a group of the formula --B--R.sup.4 (wherein B is a carbonyl group, a hydroxymethylene group or a methylene group, R.sup.4 is a cycloalkyl group having 5-8 carbon atoms) and the pharmaceutically acceptable salts thereof have anti-inflammatory activity.
Kinetic Resolution of Sulfoximines via Asymmetric Organocatalyzed Formation of Benzothiadiazine-1-oxides
作者:Mengyao Tang、Mengyao Yuan、Shibin Hong、Qianwen Jiang、Huanchao Gu、Xiaoyu Yang
DOI:10.1021/acs.orglett.4c00266
日期:2024.3.8
A catalytic kineticresolution of sulfoximines has been developed through chiral phosphoric acid-catalyzed intramolecular dehydrative cyclizations. A variety of racemic sulfoximines bearing an ortho-amidophenyl moiety underwent asymmetric dehydrative cyclizations using this method, yielding both the recovered sulfoximines and benzothiadiazine-1-oxide products with good to high enantioselectivities