A convenient synthesis of 4(5)-(2-hydroxyaroyl)-5(4)-trifluoromethyl-1,2,3-triazoles from 2-trifluoromethylchromones and chromen-4-imines
作者:Vyacheslav Ya. Sosnovskikh、Boris I. Usachev
DOI:10.1070/mc2002v012n02abeh001562
日期:——
The reactions of 2-trifluoromethylchromones and 2-trifluoromethyl-4H-chromen-4-inlines with sodium azide in the presence of acetic acid give the ketone and imine derivatives of 5(4)-trifluoromethyl-1,2,3-triazole in high yields.
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