2-Polyfluoroalkylchromones reacted with diethylenetriamine at similar to20 degreesC to form the corresponding 1,4,8-triazabicyclo[5.3.0]dec-4-ene derivatives. The crystal structures of 5-(2-hydroxyphenyl)-7-trifluoromethyl-1,4,8-triazabicyclo[5.3.0]dec-4-ene and 1-(2-aminoethyl)-7-(2-hydroxy-5-methoxyphenyl)-5-(1,1,2,2-tetrafluoroethyl)-2,3-dihydro-1H-1,4-diazepine were established by X-ray diffraction analysis.
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。
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.