1-Imidoyl-1,2,3-benzotriazoles—Novel Reagents for the Synthesis of 1-Aryl-5-trifluoromethylimidazoles
摘要:
1-Imidoylbenzotriazoles [N-aryl-1-(1H-benzotriazol-1-yl)-2,2,2-trifluoroethan-1-imines] reacted with tosylmethyl isocyanide according to van Leusen's procedure to give difficultly accessible 1-aryl-4-(4-methylbenzenesulfonyl)-5-(trifluoromethyl)-1H-imidazoles in good yields (81-94%). The initial imidoylbenzotriazoles were conveniently synthesized by reaction of sodium benzotriazolide with the corresponding imidoyl chlorides in THF. The reactions were carried out with a wide series of imidoylbenzotriazoles containing various electron-donating and electron-withdrawing substituents in the N-aryl fragment.
Base-mediated [3+2] annulation of trifluoroacetimidoyl chlorides and isocyanides: An improved approach for regioselective synthesis of 5-trifluoromethyl-imidazoles
作者:Sipei Hu、Hefei Yang、Zhengkai Chen、Xiao-Feng Wu
DOI:10.1016/j.tet.2020.131168
日期:2020.5
A t-BuOK-mediated [3 + 2] cycloaddition reaction of trifluoroacetimidoyl chlorides and active methylene isocyanides for the synthesis of 5-trifluoromethyl-imidazoles has been developed. Under mild reaction conditions, the transformation proceeds smoothly in the presence of t-BuOK to afford an array of structurally diverse 5-trifluoromethyl-imidazoles with high efficiency.
Synthesis of 1-aryl-4-tosyl-5-(trifluoromethyl)-1H-imidazoles
作者:Alexander S. Bunev、Maksim A. Vasiliev、Vladimir E. Statsyuk、Gennady I. Ostapenko、Alexander S. Peregudov
DOI:10.1016/j.jfluchem.2014.04.013
日期:2014.7
A new synthetic protocol for the synthesis of 1,4,5-trisubstituted imidazoles containing trifluoromethyl group has been developed using van Leusen reaction, which incorporates two-component condensation reaction trifluoroacetimidoyl chlorides with tosylmethylisocyanide. This protocol provides a novel and improved method for obtaining trifluoromethyl containing 1,4,5-trisubstituted imidazoles in good yields. (C) 2014 Elsevier B.V. All rights reserved.