Several [1-(2-hydroxybenzoyl)alkylidene]triphenylphosphoranes have been obtained in good yields through acylation of the corresponding alkylidenetriphenylphosphoranes, prepared in situ, by the easily available methyl 2-hydroxybenzoates. These ylides proved to be good starting materials for the synthesis of the corresponding 2-styrylchromones (2-styryl-4H-1-benzopyran-4-ones).
已通过将相应的亚烷基三苯膦(当场制备)与易获得的
2-羟基苯甲酸甲酯进行酰化反应,获得了产率良好的数种[1-(2-羟基苯甲酰基)亚烷基]三苯膦。这些叶立德已被证实是合成相应2-
苯乙烯基
色酮(2-
苯乙烯基-4H-1-苯并
吡喃-4-酮)的良好起始材料。