Synthesis and Biological Evaluation of the 1,5-Diarylpyrazole Class of Cyclooxygenase-2 Inhibitors: Identification of 4-[5-(4-Methylphenyl)-3- (trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide (SC-58635, Celecoxib)
摘要:
A series of sulfonamide-containing 1,5-diarylpyrazole derivatives were prepared and evaluated for their ability to block cyclooxygenase-2 (COX-2) in vitro and in vivo. Extensive structure-activity relationship (SAR) work was carried out within this series, and a number of potent and selective inhibitors of COX-2 were identified. Since an early structural lead (1f, SC-236) exhibited an unacceptably long plasma half-life, a number of pyrazole analogs containing potential metabolic sites were evaluated further in vivo in an effort to identify compounds with acceptable pharmacokinetic profiles. This work led to the identification of ii (4-[5-(4-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide, SC-58635, celecoxib), which is currently in phase III clinical trials for the treatment of rheumatoid arthritis and osteoarthritis.
[4 + 2] Heterocyclization for Efficient Formation of Substituted Quinoxalines through Carbon-Oxygen Bonds Cleavage
作者:Man-Su Tu、Hai-Wei Xu、Wei Fan、Bo Jiang、Shu-Jiang Tu
DOI:10.1002/jhet.2128
日期:2015.5
A new domino strategy for efficient synthesis of highlyfunctionalized quinoxaline derivatives via [4 + 2] heterocyclization involving ring‐opening of oxirane process has been developed. The reactionpromoted by Cs2CO3 was easy to perform in a simple operation from common and inexpensive starting materials. The bisfunctionalization of quinoxaline framework including C2 benzylation and C3 arylation
已开发出一种新的多米诺骨牌策略,可通过[4 + 2]杂环化(包括环氧乙烷工艺的开环)有效合成高度官能化的喹喔啉衍生物。由Cs 2 CO 3促进的反应易于由普通且廉价的起始原料以简单的操作进行。喹喔啉骨架的双功能化(包括C2苄基化和C3芳基化)很容易以多米诺骨牌的方式实现,涉及裂解1,3-二芳基-2,3-环氧丙烷-1-酮的三个C-O键。
One-pot synthesis of chalcone epoxides—A green chemistry strategy
Waste minimization is a very important aspect of an environmentally benign protocol. A one-pot consec-process has been developed for chalcone epoxide synthesis that allows compounds to be prepared having to isolate and purify the intermediates. The strategy utilizes consecutive Claisen Schmidt and epoxidation reactions to prepare chalcone epoxides from substituted benzaldehydes acetophenones in good yields. (C) 2014 Elsevier Ltd. All rights reserved.
Visible-Light-Promoted Photoredox Syntheses of α,β-Epoxy Ketones from Styrenes and Benzaldehydes under Alkaline Conditions
作者:Jing Li、David Zhigang Wang
DOI:10.1021/acs.orglett.5b02629
日期:2015.11.6
A range of styrenes and benzaldehydes were smoothly combined to form alpha,beta-epoxy ketones under the synergistic actions of photocatalyst Ru(bpy)(3)Cl-2, tert-butyl hydroperoxide (t-BuOOH), cesium carbonate (Cs2CO3), and visible light irradiation. The process likely proceeds through visible-light-enabled photocatalytic generations of acyl radicals as key intermediates.
1,3,5-TRISUBSTITUTED PYRAZOLE COMPOUNDS FOR TREATMENT OF INFLAMMATION