A process for producing a compound of the formula (I) ##SPC1## wherein R.sub.2 is a hydrogen atom or an ester protective group, which is useful as a precursor for the production of cephalosporin derivatives, comprising reacting a phosphoramide derivative of cephalosporin of the formula (II) ##SPC2## wherein R.sub.1 is a lower alkyl group and R.sub.2 is as defined above, with a phosphorus acid. A further embodiment includes preparing the phosphoramide derivative of cephalosporin of the formula (II) by reactng a compound of the formula (III) ##SPC3## wherein R.sub.1 and R.sub.2 are as defined above, with an acid compound.
一种用于生产化合物(I)的方法,其中R2是氢原子或酯保护基,该化合物可用作
头孢菌素衍
生物的前体,包括将
头孢菌素的
磷酰胺衍
生物(II)与
磷酸反应,其中R1是较低的烷基,R2如上定义。另一种实施方式包括通过将化合物(III)与酸性化合物反应来制备
头孢菌素的
磷酰胺衍
生物(II),其中R1和R2如上定义。