Synthesis of 3-(trifluoromethyl)indeno[2,1-c]pyran-1,9-diones from 4-aryl-3-carbethoxy-6-(trifluoromethyl)-2-pyrones and their reaction with sodium azide leading to new carbostyril derivatives
作者:Sergey A. Usachev、Boris I. Usachev、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tet.2013.11.033
日期:2014.1
Treatment of ethyl 4-aryl-6-(trifluoromethyl)-2-oxo-2H-pyran-3-carboxylates, prepared from 4,4,4-trifluorobutane-1,3-diones, PCl5 and sodium diethyl malonate, with sulfuric acid afforded the intramolecular Friedel–Crafts acylation products, 3-(trifluoromethyl)indeno[2,1-c]pyran-1,9-diones, from which 2-(trifluoromethyl)-6H-pyrano[3,4-c]quinoline-4,5-diones were obtained via the Schmidt reaction in
处理由4,4,4-三氟丁烷-1,3-二酮,PCl 5 和丙二酸二乙酯钠制得的4-芳基-6-(三氟甲基)-2-氧代-2- H-吡喃-3-甲酸乙酯硫酸提供了分子内Friedel-Crafts酰化产物3-(三氟甲基)茚并[ 2,1 - c ]吡喃-1,9-二酮,其中2-(三氟甲基)-6 H-吡喃并[3,4- c通过Schmidt反应以中等收率获得]喹啉-4,5-二酮。后者与叠氮化钠反应,以良好的产率得到2-氧代-4-(5-三氟甲基-1,2,3-三唑--4-基)-1,2-二氢喹啉-3-羧酸。