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
Synthesis of 6-hydroxy-5,6-dihydro-2-pyrones and -pyridones by reaction of 4-aryl-6-trifluoromethyl-2-pyrones with water, hydrazine, and hydroxylamine
作者:Sergey A. Usachev、Boris I. Usachev、Vyacheslav Ya. Sosnovskikh
DOI:10.1007/s10593-018-2209-y
日期:2017.12
Reactions of 4-aryl-6-trifluoromethyl-2H-pyran-2-ones with sodium hydroxide followed by acidification provided the respective 6-hydroxy-5,6-dihydro derivatives, while the reactions of 4-aryl-6-trifluoromethyl-2H-pyran-2-ones with hydrazine and hydroxylamine were accompanied by rearrangement to N-substituted 6-hydroxy-5,6-dihydro-2-pyridones.
Convenient Synthesis of Ethyl 4-Aryl-6-(trifluoromethyl)-2-oxo-2<i>H</i>-pyran-3-carboxylates and 4-Aryl-6-(trifluoromethyl)-2<i>H</i>-pyran-2-ones: Novel Highly Reactive CF<sub>3</sub>-Containing Building Blocks
作者:Boris I. Usachev、Dmitrii L. Obydennov、Gerd-Volker Röschenthaler、Vyacheslav Ya. Sosnovskikh
DOI:10.1021/ol800992z
日期:2008.7.3
An expedient synthesis of a series of 2-pyrones, bearing a CF3 group at the 6-position and aryl group at position 4, from readily available aryl-4,4,4-trifluorobutane-1,3-diones, PCl5, and sodium diethyl malonate is described.
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 4-aryl-6-methyl-7a-(trifluoromethyl)-2,4a,5,6,7,7a-hexahydropyrano[2,3-c]pyrrol-2-ones from 4-aryl-6-(trifluoromethyl)-2-pyrones, sarcosine, and formaldehyde
作者:Sergey A. Usachev、Natal’ya V. Popova、Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh
DOI:10.1007/s10593-015-1795-1
日期:2015.10
4-Aryl-6-(trifluoromethyl)-2-pyrones reacted with the nonstabilized azomethine ylide obtained from sarcosine and formaldehyde under reflux in benzene for 6 h, resulting in [3+2] cycloaddition that gave 4-aryl-6-methyl-7a-(trifluoromethyl)-2,4a, 5,6,7,7a-hexahydropyrano-[2,3-c]pyrrol-2-ones in 42-56% yields. In the case of 4-aryl-3-carbethoxy-6-(trifluoromethyl)-2-pyrones, besides the respective pyrano[ 2,3-c]pyrrolidines (66-71% yields) also 4-aryl-1-methyl-2-(trifluoromethyl)pyrroles were isolated as minor products.