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.
Rhodium-catalyzed denitrogenative thioacetalization of N-sulfonyl-1,2,3-triazoles with disulfides: an entry to diverse transformation of terminal alkynes
Regioselective Synthesis of Selenide Ethers through a Decarboxylative Coupling Reaction
作者:Fei-Hu Cui、Jing Chen、Shi-Xia Su、Yan-li Xu、Heng-shan Wang、Ying-ming Pan
DOI:10.1002/adsc.201700676
日期:2017.11.23
An efficient and selective approach to the synthesis of selenide ethers containing one or two geminal C–Se bonds from readily available diselenides and phenylacetic acids was developed. Compounds containing one C–Se bond were prepared by employing air as the oxidant under metal-free conditions, whereas compounds having two geminal C–Se bonds were formed via the iron(III) chloride/oxygen/cesium carbonate
已开发出一种有效的,选择性的方法,可以从容易获得的二硒化物和苯乙酸合成含一个或两个双键C-Se键的硒醚。通过在无金属条件下将空气用作氧化剂来制备包含一个C-Se键的化合物,而通过氯化铁(III)/氧/碳酸铯(FeCl 3 / O 2)形成具有两个双键C-Se键的化合物。/ Cs 2 CO 3)系统。此外,在标准反应条件下,1,2-二苯基二硫烷也可以平稳地转化为相应的硫醚产物。
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
Direct conversion of carboxylic acids and carboxylic esters into S,S′-diphenyl acetals and phenyl sulfides with thexylphenylthioborane
作者:Sunggak Kim、Sung Soo Kim
DOI:10.1016/s0040-4039(00)96008-8
日期:1987.1
Reaction of carboxylic acids with thexylphenylthioborane in methylene chloride at room temperature gives S,S′-diphenyl acetals in high yields and carboxylic esters are converted into phenyl sulfides in the presence of zinc iodide under similar conditions.
Cerium Triflate: An Efficient and Recyclable Catalyst for Chemoselective Thioacetalization of Carbonyl Compounds under Solvent-Free Conditions
作者:Anil Kumar、M. Sudershan Rao、V. Kameshwara Rao
DOI:10.1071/ch09296
日期:——
A simple and efficient chemoselectivethioacetalization of carbonylcompounds has been achieved using Ce(OTf)3 (10 mol-%) as a catalystunder solvent-free conditions. Advantages of the methodology include very short reaction times, excellent yields, the catalytic use of a water tolerant Lewis acid, and simple recovery and reuse of the catalyst.
Green, catalyst-free thioacetalization of carbonyl compounds using glycerol as recyclable solvent
作者:Gelson Perin、Luzia G. Mello、Cátia S. Radatz、Lucielli Savegnago、Diego Alves、Raquel G. Jacob、Eder J. Lenardão
DOI:10.1016/j.tetlet.2010.06.049
日期:2010.8
We describe herein the use of glycerol as an efficient and a recyclablesolvent in the thioacetalization of aldehydes and ketones. The catalyst-free reactions proceed easily usingglycerol at 90 °C and the corresponding thioacetals were obtained in good to excellent yields. Glycerol was recovered and utilized for further thioacetalization reactions.