A mild and efficient one-flask method has been developed for the synthesis of chromones, isoflavones, and homoisoflavones from 2-hydroxyacetophenones, deoxybenzoins, and dihydrochalcones, respectively, via one-carbon extension using the complex 2,4,6-trichloro-1,3,5-triazine/dimethylformamide. Deoxybenzoins and dihydrochalcones were prepared in situ by the reaction of readily available substituted phenols with phenylacetic acids and 3-phenylpropanoic acids, respectively. This method allows the synthesis of a wide range of compounds with multiple phenolic hydroxyls and other substituents. The methodology has been applied to the synthesis of three naturally occurring isoflavones such as formononetin (9c), daidzein (9d), and retusin (9h).
已开发出一种温和高效的一瓶法合成方法,用于从2-羟基苯乙酮、去氧苯甲酮和二氢黄酮分别通过一碳延伸使用复合物2,4,6-三氯-1,3,5-三嗪/二甲基甲酰胺合成香豆素、异黄酮和同异黄酮。去氧苯甲酮和二氢黄酮分别通过易得的取代苯酚与苯乙酸和3-苯基丙酸反应原位制备。该方法允许合成具有多个酚羟基和其他取代基的广泛化合物。该方法已应用于合成三种天然存在的异黄酮,如异黄酮(9c)、黄豆异黄酮(9d)和利图素(9h)。