Glufosinate, 2-amino-4-[(hydroxy)methylphosphinyl]butanoic acid, (2a) was synthesized from 2-chloroethyl methylvinylphosphinate (1a) via successive hydroformylation–amidocarbonylation. Hydroformylation of 1a catalyzed by Co2(CO)8 in methanol gave 2-chloroethyl (3,3-dimethoxypropyl)methylphosphinate (5). Crude 5 was subjected to cobaltcatalyzed amidocarbonylation to afford N-acylglufosinic acid methyl ester (2b). Hydrolysis of 2b under acidic conditions gave 2a quantitatively.
草铵膦,2-
氨基-4-[(羟基)甲基次膦基]
丁酸,(2a)是由2-
氯乙基甲基
乙烯基次膦酸酯(1a)通过连续加氢甲酰化-酰
氨基羰基化合成的。 1a 在
甲醇中经 Co2(CO)8 催化加氢甲酰化,得到 (3,3-二甲氧基丙基)甲基
次膦酸 2-
氯乙酯 (5)。将粗品5进行
钴催化的酰
氨基羰基化,得到N-酰基
草铵膦酸甲酯(2b)。 2b在酸性条件下
水解定量得到2a。