Design and synthesis of (E)-1,1,2-triarylethenes: novel inhibitors of the cyclooxygenase-2 (COX-2) isozyme
摘要:
A novel class of acyclic 1,1,2-triaryl (E)-ethenes was designed that were synthesized via an (E)-selective Takeda olefination reaction. Among the group of compounds evaluated, (E)-2-(4-fluorophenyl)-1-(4-methylsulfonylphenyl)-1-phenylethene (10c) emerged as the most potent (COX-2 IC50 = 0.0316 muM), and selective (selectivity index > 3164), COX-2 inhibitor. (C) 2004 Elsevier Ltd. All rights reserved.
A Transition-Metal-Free and Base-Mediated Carbene Insertion into Sulfur-Sulfur and Selenium-Selenium Bonds: An Easy Access to Thio- and Selenoacetals
作者:Dhanarajan Arunprasath、Govindasamy Sekar
DOI:10.1002/adsc.201600855
日期:2017.2.20
A transition‐metal‐free and base‐mediated carbene insertion across sulfur‐sulfur and selenium‐selenium bonds has been developed by employing N‐tosylhydrazone as a stable and safe carbene precursor. The ylide formation from carbene followed by Stevens rearrangement are considered to be the key steps. This thiol and selenol‐free protocol delivers thioacetals and selenoacetals in good to excellent yields
Reduction of titanocene dichloride with dysprosium: access to a stable titanocene(<scp>ii</scp>) equivalent for phosphite-free Takeda carbonyl olefination
A new titanocene(ii) equivalent obtained from the reduction of titanocene dichloride with dysprosium allows phosphite-free and simplified Takeda carbonyl olefination reactions.
Dithioacetalization or thioetherification of benzyl alcohols using 9-mesityl-10-methylacridinium perchlorate photocatalyst
作者:Milan Pramanik、Khokan Choudhuri、Ashis Mathuri、Prasenjit Mal
DOI:10.1039/d0cc02352c
日期:——
We report herein the use of 9-mesityl-10-methylacridinium perchlorate as the visible-light photocatalyst for dithioacetalization or thioetherification of benzyl alcohols in one pot using aerial dioxygen as a terminal oxidant. EPR analysis and Stern–Volmer quenching studies helped to rationalize the single electron transfer (SET) mechanism.
Rhodium-catalyzed denitrogenative thioacetalization of N-sulfonyl-1,2,3-triazoles with disulfides: an entry to diverse transformation of terminal alkynes
作者:Hao Zhang、Hui Wang、Haijun Yang、Hua Fu
DOI:10.1039/c5ob00638d
日期:——
An efficient and useful rhodium-catalyzed denitrogenative thioacetalization of N-sulfonyl-1,2,3-triazoles has been developed for the first time and the corresponding hydrolytic and reductive products with thioacetals were obtained in good to excellent yields.