Thermolysis of β-hydroxysulfides bearing several heteroaromatics
摘要:
Thermolyses of beta-hydroxysulfides 2, bearing groups, such as 2-benzothiazolyl and 4-(4-methyl)-4H-1,2,4-triazolyI groups, were studied and found to afford the corresponding substituted styrenes 5 and hydroxy heteroaromatics in good yields, respectively. The product distribution change in the course of the thermolysis of 2a was also studied. The olefin products 5a were considered to be formed by the thermal desulfurization of the corresponding thiiranes 4a initially formed via the five-membered spiro intermediate 6a. (c) 2007 Elsevier Ltd. All rights reserved.
Iodine Promoted Regioselective α-Sulfenylation of Carbonyl Compounds using Dimethyl Sulfoxide as an Oxidant
作者:Yogesh Siddaraju、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.orglett.6b03084
日期:2016.12.2
A metal-free regioselective sulfenylation of the α-CH3 group of ketones has been achieved in the presence of the α-CH2 or α-CH group using the cross dehydrogenative (CDC) strategy. Aldehydes also exhibit good selectivity forming the corresponding α-sulfenylated products. This efficient sulfenylation of ketones or aldehydes with thiones or heterocyclic thiols utilizes dimethyl sulfoxide (DMSO) as an
Zinc Oxide Catalyzed Solvent-Free Mechanochemical Route for C-S Bond Construction: A Sustainable Process
作者:P. Md. Khaja Mohinuddin、N. C. Gangi Reddy
DOI:10.1002/ejoc.201601425
日期:2017.2.24
Zinc oxide-catalyzed solvent-freemechanochemical route has been developed for the rapid construction of C-S bond using a variety of thiols and phenacyl/benzyl/alkyl bromides via a nucleophilic substitution (SN2 mechanism). Notable advantages of this method include broad substrate scope, cleaner reaction profile, safe, scalable, high yields at ambient conditions and reuse of catalyst. Further, the
Three in one: Applying an organocatalytic tandem strategy to build a library of opticallyactive alkynyl, alkenyl, and ketone products, starting from cyclic enones and β‐keto sulfones, is shown to be rapid and efficient (see scheme; R=aryl, R′=H or alkyl).
三合一:从环烯酮和β-酮砜开始,应用有机催化串联策略建立光学活性炔基,烯基和酮产物的库是快速有效的(请参阅方案; R =芳基,R '= H或烷基)。
A series of 3-heteroarylthioquinoline derivatives has been synthesized by the Friedlander annulation of 2-[(5-methyl-1,3,4-thiadiazol-2-yl)sulfanyl]-1-aryl-1-ethanone/2-(1,3-benzothiazol-2-ylsulfanyl)-1-aryl-1-ethanone/1-aryl-2-[(2-phenyl-2H-1,2,3,4-tetraazol-5-yl)sulfanyl]-1-ethanone with 2-aminobenzophenone in good yields using YbCl3 as the catalyst. These compounds have been screened for their in vitro activity against Mycobacterium tuberculosis H37Rv (MTB) and among the 21 compounds screened, 2-[2-(4-bromophenyl)-4-phenyl-3-quinolyl]sulfanyl-5-methyl-1,3,4-thiadiazole (5d) and 2-[2-(4-chlorophenyl)-4-phenyl-3-quinolyl]sulfanyl-5-methyl-1,3,4-thiadiazole (5c) were found to be the most active compounds with MIC of 3.2 and 3.5 mu M respectively against MTB. The cytotoxic effects against mouse fibroblasts (NIH 3T3) in vitro were evaluated for 5c and 5d, which displayed no toxic effects (IC50 > 1000 mu M) against the mouse fibroblast cell line NIH 3T3. (C) 2011 Elsevier Masson SAS. All rights reserved.