An iron-catalyzed practical synthesis of 2-trifluoromethylarylimidazoles through condensation of o-arylenediamines and hexafluoroacetylacetone followed by intramolecular addition and C–C bond cleavage in one-pot has been developed. A series of title compounds were obtained with up to 99% yield. This method is quite practical and suitable for scalable preparation due to simple experimental procedure
Use of 2-substituted benzimidazole as smooth muscle cell proliferation
申请人:American Home Procucts Corporation
公开号:US05763473A1
公开(公告)日:1998-06-09
The use of compounds of the formula: ##STR1## where R.sub.1 is alkyl, trifluoromethyl or pyridinyl; R.sub.2 is H, alkyl or substituted arylalkyl, in which the substituents are one or two halogens, carboxyl or alkoxycarbonyl groups; R.sub.3 and R4 are H, alkyl, halogen or nitro; or a pharmaceutically acceptable salt thereof, as inhibitors of smooth muscle cell proliferation.
Disclosed herein are compounds of the formula: ##STR1## where R.sub.1 is alkyl, trifluoromethyl or pyridinyl; R.sub.2 is H, alkyl or substituted arylalkyl, in which the substituents are one or two halogens, carboxyl or alkoxycarbonyl groups; R.sub.3 and R.sub.4 are H, alkyl, halogen or nitro; or a pharmaceutically acceptable salt thereof, which are useful as inhibitors of smooth muscle cell proliferation.
Synthesis of 2-trifluoromethyl benzimidazoles, benzoxazoles, and benzothiazoles <i>via</i> condensation of diamines or amino(thio)phenols with CF<sub>3</sub>CN
method is developed for the synthesis of 2-trifluoromethyl benzimidazoles, benzoxazoles, and benzothiazoles in good to excellent yields by the condensation of diamines or amino(thio)phenols with in situ generated CF3CN. Additionally, the synthetic utility of the 2-trifluoromethyl benzimidazole and benzoxazole products is demonstrated via gram scale synthesis. The mechanisticstudy suggests that the reaction
Efficient syntheses of 2-fluoroalkylbenzimidazoles and -benzothiazoles
作者:Olivier René、Alexandra Souverneva、Steven R. Magnuson、Benjamin P. Fauber
DOI:10.1016/j.tetlet.2012.09.069
日期:2013.1
We report an efficient one-step route to 2-fluoroalkylbenzimidazoles and -benzothiazoles via the condensation of fluorinated carboxylic acids and aromatic diamines or aminothiophenols. Additionally, we describe the syntheses of fluoroalkyl-azabenzimidazoles, -purines, and -imidazolopyrazines. This method is high-yielding with broad scope and is operationally simple with potential application to parallel synthesis. (C) 2012 Elsevier Ltd. All rights reserved.