A simple and convenient synthesis of 3-[5-(trifluoromethyl)-1,2,3-triazol-4-yl]cinnamic acids from 4-aryl-6-(trifluoromethyl)-2H-pyran-2-ones and sodium azide
作者:Boris I. Usachev、Sergey A. Usachev、Gerd-Volker Röschenthaler、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tetlet.2011.09.149
日期:2011.12
4-Aryl-6-(trifluoromethyl)-2H-pyran-2-ones and ethyl 4-aryl-6-(trifluoromethyl)-2-oxo-2H-pyran-3-carboxylates react with sodium azide to produce highly functionalized CF3-1,2,3-triazoles: 3-[5-(trifluoromethyl)-1,2,3-triazol-4-yl]cinnamic acids and monoethyl esters of [5-(trifluoromethyl)-1,2,3-triazol-4-yl]arylmethylidene malonic acids. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of isomerically pure 3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamic acid derivatives via the reaction of 4-aryl-6-trifluoromethyl-2-pyrones with sodium azide
作者:Sergey A. Usachev、Boris I. Usachev、Oleg S. Eltsov、Vyacheslav Y. Sosnovskikh
DOI:10.1016/j.tet.2014.09.093
日期:2014.11
afforded the corresponding (Z)-3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamicacids in good yields. Similarly, 4-aryl-3-carbethoxy-6-trifluoromethyl-2-pyrones smoothly reacted with sodium azide in acetonitrile to produce (E)-2-ethoxycarbonyl-3-(5-trifluoromethyl-1,2,3-triazol-4-yl)cinnamicacids in high yields, whereas their reactions in ethanol, accompanied by a configurational change, gave the thermodynamically