Cu-Catalyzed one-pot synthesis of thiochromeno-quinolinone and thiochromeno-thioflavone <i>via</i> oxidative double hetero Michael addition using <i>in situ</i> generated nucleophiles
作者:Nallappan Sundaravelu、Govindasamy Sekar
DOI:10.1039/d0cc03210g
日期:——
catalyzed three-component synthesis of π-conjugated tetracyclic thiochromeno-quinolinone and thiochromeno-thioflavone was established via oxidative double hetero Michael additionusing in situ generated nucleophiles. Xanthate plays a dual role as an odourless sulfur source and a chemoselective reducing agent. The in situ formed iodine plays a crucial role in the oxidation step.
The involvement of the trisulfur radical anion in electron-catalyzed sulfur insertion reactions: facile synthesis of benzothiazine derivatives under transition metal-free conditions
作者:Zheng-Yang Gu、Jia-Jia Cao、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1039/c6sc00240d
日期:——
An efficient and practical synthesis of benzothiazine by K2S initiated sulfur insertion reaction with enaminones via electron catalysis is developed. This protocol provides a new, environment-friendly and simple strategy to construct benzothiazine derivatives viaformation of two C–S bonds under transition metal-free, additive-free and oxidant-free conditions. K2S not only provides the sulfur insertion
Cu-Catalyzed and iodine mediated synthesis of thioaurones <i>via in situ</i> C–S bond generation using xanthate as a sulfur surrogate
作者:Palanisamy Soundarya、Govindasamy Sekar
DOI:10.1039/d2ob01211a
日期:——
An efficient method for synthesizing thioaurones has been developed using xanthate as an odorless sulfur surrogate. This reaction's key success lies in the use of iodine as a reagent, which promotes the α-iodination followed by cyclization of saturated ketones. This methodology has also been demonstrated with less reactive 2′-bromochalcones in good yield. Synthesis of the red isomer of indigo, i.e
a-FABP is indespensible in inflammation and may serve as a new potential drug target for inflammation related diseases. We have successfully designed and synthesized a series of aromatic substituted pyrazoles as new human a-FABP inhibitors. The compounds strongly bound to the hydrophobic binding pocket of a-FABP, while showed significantly lower binding affinities to the closely related homologue protein h-FABP. The most potent and selective compound 5g bound to a-FABP with an apparent K-i value below 1.0 nM, while did not inhibit h-FABP at 50 mu M and thus represents one of the most potent and selective a-FABP inhibitors to date. The strong binding capacity of these inhibitors was further validated by their effective blockade of inflammatory responses as determined by the production of pro-inflammatory cytokines upon LPS stimulation. Compound 5g may serve as a lead compound for developing new effective therapeutic agent for prevention and treatment of atherosclerosis, type 2 diabetes and other inflammatory and metabolic related diseases. (C) 2011 Elsevier Ltd. All rights reserved.