Convenient synthesis of 1,6,7,8-substituted 2-(3′,4′-substituted-phenyl)-4-quinolones<i>via</i>a 4-ethoxyflavylium salt
作者:Shingo Sato、Takeshi Watanabe、Hironobu Kumagai、Nobuo Kitamura、Shigeru Matsuba、Toshihiro Kumazawa、Jun-Ichi Onodera、Masanobu Suzuki
DOI:10.1002/jhet.5570360513
日期:1999.9
Condensation of 2-hydroxyacetophenone with benzaldehyde in the presence of 70% perchloric acid in ethyl orthoformate gave the corresponding 4-ethoxyflavylium perchlorate, which was treated with aqueous ammonia or methylamine solution to afford 1,6,7,8-substituted 2-(3′,4′-substituted-phenyl)-4-quinolone in fair to good yield.
在70%高氯酸在原甲酸乙酯中将2-羟基苯乙酮与苯甲醛缩合,得到相应的4-乙氧基高氯酸黄酮,将其用氨水或甲胺溶液处理,得到1,6,7,8-取代的2-(3 ′,4′-取代的苯基)-4-喹诺酮,收率中等至良好。