Reactions of 2-(trifluoromethyl)chromones with cyanoacetamides, ethyl cyanoacetate and diethyl malonate. Unexpected synthesis of benzo[c]coumarin derivatives
作者:Vyacheslav Ya. Sosnovskikh、Alexander V. Safrygin、Viktor A. Anufriev、Oleg S. Eltsov、Viktor O. Iaroshenko
DOI:10.1016/j.tetlet.2011.09.082
日期:2011.11
2-(trifluoromethyl)chromones react with cyanoacetamides in the presence of sodium ethoxide to produce 6-(2-hydroxyaryl)-4-(trifluoromethyl)-2-oxo-1,2-dihydropyridine-3-carbonitriles, their reactions with ethyl cyanoacetate and diethyl malonate under the same conditions took an entirely different course and gave novel functionalized derivatives of 6H-benzo[c]chromen-6-one.
尽管2-(三氟甲基)色酮在乙醇钠存在下与氰基乙酰胺反应生成6-(2-羟基芳基)-4-(三氟甲基)-2-氧代-1,2-二氢吡啶-3-甲腈,但它们与乙基的反应在相同条件下,氰基乙酸酯和丙二酸二乙酯采用完全不同的过程,得到了6 H-苯并[ c ] chromen-6-one的新型官能化衍生物。