Novel thiazolylacetic acid derivative of the formula: ##STR1## wherein R.sup.1.sub.N H-- is amino or a protected amino group, R.sup.2 is hydrogen or lower alkyl, --COOR.sup.3 is carboxy or a protected carboxy group and n is an integer of 2 or 3, and processes for preparing the same. The compound (I) is useful as an intermediate in the synthesis of cephalosporins.
新型
噻唑乙酸衍
生物的
化学式为:##STR1## 其中R.sup.1.sub.N H--为
氨基或受保护的
氨基基团,R.sup.2为氢或低碳基,--COOR.sup.3为羧基或受保护的羧基团,n为2或3的整数,以及制备该化合物的方法。该化合物(I)可作为
头孢菌素合成中间体。