Electrophilic nitration of 2-trifluoromethylchromone and its 6- and 7-methoxy derivatives affords 6-, 5-, and 8-nitro derivatives, respectively, while 5,7-dimethyl-2-trifluoromethylchromone yields a 6,8-dinitro derivative. Radical chlorination results in 3-chloro derivatives.
Synthesis of 2-(trifluoromethyl)-1,2-dihydro-4H-thieno[2,3-c]chromen-4-ones and 2-(trifluoromethyl)-4H-thieno[2,3-c]chromen-4-ones from 2-trifluoromethylchromones and ethyl mercaptoacetate
作者:Vyacheslav Ya Sosnovskikh、Boris I Usachev、Dmitri V Sevenard、Gerd-Volker Röschenthaler
DOI:10.1016/s0040-4020(03)00329-6
日期:2003.4
mercaptoacetate in the presence of triethylamine results in the formation of 1,2-dihydrothieno[2,3-c]chromen-4-ones and diethyl 3,4-dithiadipate in high yields. Oxidation of the first compounds with nitrogen dioxide gave 1,2-dihydrothieno[2,3-c]chromen-3,4-diones which were converted into thieno[2,3-c]chromen-4-ones.
在三乙胺的存在下,2-三氟甲基色酮与巯基乙酸乙酯的氧化还原反应可高产率地形成1,2-二氢噻吩并[2,3 - c ]铬-4-酮和3,4-二硫代二乙酯二乙酯。用二氧化氮氧化第一化合物,得到1,2-二氢噻吩并[2,3- c ] chromen-3,4-二酮,将其转化为噻吩并[2,3 - c ] chromen-4-ones。
Reaction of 2-trifluoromethylchromones with cyanoacetic and malonic esters. Synthesis of new benzo[c]coumarin derivatives
作者:V. Ya. Sosnovskikh、A. V. Safrygin、V. A. Anufriev
DOI:10.1007/s11172-013-0320-x
日期:2013.10
2-trifluoromethylchromones with ethyl cyanoacetate and diethyl malonate in ethanol in the presence of sodium ethoxide furnished a number of new benzo[c]coumarin derivatives, which were formed with involvement of two ester molecules.
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 ethylcyanoacetate 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。
Synthesis of 6-(2-hydroxyaryl)-2-pyridones by the reaction of chromones with cyanoacetic, acetoacetic, and malonic acid amides
作者:A. V. Safrygin、V. A. Anufriev、V. Ya. Sosnovskikh
DOI:10.1007/s11172-013-0181-3
日期:2013.5
A reaction of chromones with cyanoacetic, acetoacetic, and malonic acid amides in the presence of sodium ethoxide furnished a number of new 3-substituted 6-(2-hydroxyaryl)-2-pyridones in good yields, including those containing a polyfluoroalkyl group at position 4.
Unusual Reaction of 2-(Trifluoromethyl)-1,2-dihydro-3λ<sup>6</sup>-thieno- [2,3-<i>c</i>]chromen-3,3,4-triones with Hydrazine as a New Route to 3-Hydrazinopyridazine Derivatives
作者:Vyacheslav Ya. Sosnovskikh、Boris I. Usachev、Ivan I. Vorontsov
DOI:10.1021/jo0258406
日期:2002.9.1
Oxidation of 2-(trifluoromethyl)-1,2-dihydro-4H-thieno[2,3-c]chromen-4-ones 2 with H(2)O(2) in AcOH gives 2-(trifluoromethyl)-1,2-dihydrothieno[2,3-c]chromen-3,3,4-triones 3, which are transformed into 3-hydrazinopyridazine derivatives 4 in high yields by treatment with hydrazine hydrate in ethanol.