Thioformamidophosphono-acetates are prepared by reacting an isocyano compound of the formula C=N--CH.sub.2 --X.sub.1 in the presence of a base with a compound of the formula R.sub.o --X.sub.2, in which compounds one of the groups X.sub.1 and X.sub.2 represents a protected carboxyl group of the formula --C(=O)--OR.sub.1 and the other a disubstituted phosphono group of the formula --P(.fwdarw.O)(OR).sub.2, and wherein R.sub.o represents a reactive etherified or esterified hydroxyl group, and adding hydrogen sulphide on to the isocyano group of the phosphono-isocyano-acetate formed as an intermediate.
Thioformamidophosphono-acetates是通过在碱存在下将公式为C = N-CH.sub.2-X.sub.1的异腈化合物与公式为R.sub.o-X.sub.2的化合物反应而制备的。其中,化合物X.sub.1和X.sub.2中的一个代表保护的羧基,其
化学式为--C(=O)--OR.sub.1,另一个代表二取代的
膦酸基,其
化学式为--P(.fwdarw.O)(OR).sub.2,其中R.sub.o代表反应性的醚化或
酯化羟基。然后,在形成的
磷酸异腈酸盐中,对异腈基添加
氢硫化物作为
中间体。