α-Acetylstyrylphosphonates were conveniently synthesized from 2-oxopropylphosphonates and substituted (dimorpholinomethyl)-benzenes (aminals). 4-Benzylidenemorpholinium carboxylates, generated from aminals by the action of α-halo acids, reacted with the phosphonates to give the products by elimination of the amine. The yields were influenced by the nature of substituents and their position in the phenyl ring and could be improved by adjustment of the acidities of the reacted acids. α-Acetylstyrylphosphonates containing various substituents on every position (at the 2-, 3-, or 4-position) in the phenyl ring were obtained generally in excellent yields using monochloroacetic acid.
α-Acetylstyryl
磷酸酯可以通过2-氧代丙基
磷酸酯和取代的(二吗啉甲基)苯(
氨基
缩醛)方便地合成。在α-卤代酸的作用下,从
氨基
缩醛生成的4-苄叉吗啉鎓
羧酸酯与
磷酸酯反应,通过消除胺得到产物。产率受取代基的性质及其在苯环中的位置影响,并且可以通过调整反应酸的酸度来提高。使用单
氯乙酸,通常可以以优异的产率获得在苯环的2-、3-或4-位置上含有各种取代基的α-Acetylstyryl
磷酸酯。