Copper‐Promoted N‐Arylation of the Indole Side Chain of Tryptophan Using Triarylbismuthines
作者:Adrien Le Roch、Hwai‐Chien Chan、Alexandre Gagnon
DOI:10.1002/ejoc.202000667
日期:2020.9.30
for the regioselective N‐arylation of the indole sidechain of tryptophan using triarylbismuth reagents as the arylating agent is reported. The reaction is catalyzed by copper(II) acetate in the presence of an organic base. The protocol allows the installation of electron rich or poor aryl groups with substituents at any position, shows excellent scope and functional group compatibility, and retains
Copper‐Promoted O‐Arylation of the Phenol Side Chain of Tyrosine Using Triarylbismuthines
作者:Adrien Le Roch、Martin Hébert、Alexandre Gagnon
DOI:10.1002/ejoc.202000790
日期:2020.9.7
for the O‐arylation of the sidechain of tyrosine usingtriarylbismuthreagents is reported. The reaction is performed in dichloromethane under oxygen at 50 °C in the presence of pyridine, is promoted by copper diacetate, shows excellent scope and functional group tolerance, and retains the integrity of the chiral center. The reactivity of other amino acids possessing a nucleophilic sidechain under these
The N-arylation of indoles, indazoles, pyrroles, and pyrazoles using highly functionalized trivalent arylbismuth reagents is reported. The reaction is promoted by a substoichiometric amount of copper acetate, and it tolerates a wide diversity of functional groups on the azole and the organobismuth reagent. The method is also applied to the N-arylation of tryptophan derivatives.
Thiourea and benzamide compounds, compositions and methods of treating or preventing inflammatory diseases and atherosclerosis
申请人:Warner-Lambert Company
公开号:US06268387B1
公开(公告)日:2001-07-31
The present invention provides compounds of formula (I). The present invention also provides methods of treating or preventing inflammation or atherosclerosis, and a pharmaceutical composition that contains a compound of formula (I).
Multicomponent synthesis of sulfonamides from triarylbismuthines, nitro compounds and sodium metabisulfite in deep eutectic solvents
作者:Xavier Marset、Javier Torregrosa-Crespo、Rosa M. Martínez-Espinosa、Gabriela Guillena、Diego J. Ramón
DOI:10.1039/c9gc01541h
日期:——
Na2S2O5 and nitro compounds in a DeepEutecticSolvent (DES) as a reaction medium is described. Thus, triarylbismuthines are used as reagents for the incorporation of SO2 into organic motifs. The bismuth salts formed as by-products can be easily removed from the crude reaction mixture by precipitation with water, while the use of volatile organic compounds (VOCs) as solvents can be avoided in the entire
描述了一种在深度共晶溶剂(DES)中使用铜催化的方法从三芳基双变异蛋白,Na 2 S 2 O 5和硝基化合物开始可持续合成磺酰胺的方法。因此,将三芳基双突变蛋白用作掺入SO 2的试剂变成有机图案。通过用水沉淀,可以很容易地从粗反应混合物中除去作为副产物形成的铋盐,同时在整个过程中可以避免使用挥发性有机化合物(VOC)作为溶剂。用作溶剂的低共熔混合物已得到充分表征,初步结果证明其毒性低。设计的DES还可以进行新颖的多组分反应,从而节省时间并减少纯化步骤,能源和成本。