An improved method for the synthesis of 1-aminosubstituted benzyl phosphonic and -phosphinic acids under mild conditions is described. It consists of the reaction of diphenoxy chlorophosphine (1) or dichlorophenylphosphine (6) with substituted benzaldehydes 2 and a phosphoramidate 3 in the presence of a Lewis acid, followed by selective cleavage of the protective group of the resultant 1-(phosphorylamino)-substituted benzylphosphonate 4 or phosphinate 7, 9. A tentative reaction mechanism is postulated.
描述了一种在温和条件下合成1-
氨基取代的苯
甲基膦酸和
膦酸酯的改进方法。该方法包括在
路易斯酸存在下,二苯氧基
氯膦(1)或二
氯苯基膦(6)与取代
苯甲醛(2)和膦酰胺酸酯(3)反应,随后选择性断裂所得的1-(膦酰胺基)-取代苯
甲基膦酸酯(4)或
膦酸酯(7, 9)的保护基团。推测了可能的反应机制。