Highly regioselective synthesis of trifluoromethyl derivatives of pyrazolo[1,5-a]pyrimidines bearing fused cycloalkane rings using (2-ethoxycycloalkenyl)-2,2,2-trifluoroethanones
作者:Elena E. Emelina、Aleksander A. Petrov、Stanislav I. Selivanov、Yulia V. Nelyubina、Mikhail Yu. Antipin
DOI:10.1016/j.jfluchem.2009.06.014
日期:2009.10
8-Trifluoromethyl-6,7-dihydro-5H-1,4,8a-triaza-s-indacene and 9-trifluoromethyl-5,6,7,8-tetrahydropyrazolo[5,1-b]quinazolines were efficiently generated by condensation of 5(3)-aminopyrazoles with (2-ethoxycycloalkenyl)-2,2,2-trifluoroethanones and isolated in excellent yields. The regiochemistry of the prepared compounds was established by 1H, 13C and 19F NMR spectroscopy and X-ray diffraction analysis
-8-三氟甲基-6,7-二氢-5- ħ -1,4,8a三氮杂-小号-indacene和9-三氟甲基-5,6,7,8-四氢[5,1- b被有效地生成]喹唑啉5(3)-氨基吡唑类与(2-乙氧基环烯基)-2,2,2-三氟乙炔的缩合反应,收率高。通过1 H,13 C和19 F NMR光谱法和X射线衍射分析确定了所制备化合物的区域化学。