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)cinnamic acids 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)cinnamic acids in high yields, whereas their reactions in ethanol, accompanied by a configurational change, gave the thermodynamically
在DMSO中用叠氮化钠处理4-芳基-6-三氟甲基-2-吡喃酮,以良好的收率得到相应的(Z)-3-(5-三氟甲基-1,2,3-三唑-4-基)肉桂酸。类似地,4-芳基-3-碳乙氧基-6-三氟甲基-2-吡喃酮与叠氮化钠在乙腈中平稳反应,生成(E)-2-乙氧基羰基-3-(5-三氟甲基-1,2,3-三唑-4 -基)肉桂酸的收率高,而它们在乙醇中的反应伴随构型变化,使热力学上更稳定的(Z)-2-乙氧基羰基-3-(5-三氟甲基-1,2,3-三唑-4 -基)肉桂酸。