4-hydroxy-5-benzofuranyl ketone (II) and ethyl orthoformate. 2) 7-Hydroxy-8-formyl-isoflavone (V) was obtained from 7-hydroxy-isoflavone (IV) by the hexamine method. 5′-Car-bethoxy-furano(2′,3′: 7, 8)-isoflavone (VI) was prepared from 7-hydroxy-8-formyliso-flavone (V) and ethyl bromomalonate by Tanaka’s method for benzofuran synthesis. The ester VI was hydrolyzed to the free acid VII and then decarboxylated in quinoline
1)
呋喃 (2',3': 7,8)-异
黄酮 (III) 由苄基
4-羟基-
5-苯并呋喃基酮 (II) 和原
甲酸乙酯制备。2) 7-羟基-8-甲酰基-异
黄酮(V)由7-羟基-异
黄酮(IV)通过
六胺法得到。5'-Car-bethoxy-furano(2',3': 7, 8)-异
黄酮 (VI) 由 7-羟基-8-甲酰基异
黄酮 (V) 和
溴丙二酸乙酯通过 Tanaka 的
苯并呋喃合成方法制备。酯VI
水解成
游离酸VII,然后在
喹啉中用
铜粉脱羧成异
黄酮III。