Substituted phenylacetic acid compounds represented by the following general formula and preparation thereof: ##STR1## wherein R.sup.1 is hydrogen or protected carboxy, R.sup.2 is hydrogen, or protected amino, provided that when R.sup.1 is hydrogen, then R.sup.2 is protected amino, and when R.sup.2 is hydrogen, then R.sup.1 is protected carboxy, R.sup.3 is oxo, hydroxyimino or protected hydroxyimino, R.sup.4 is hydrogen or halogen, and m is an integer of 1 to 3.
代表以下通式并涉及其制备的取代
苯乙酸化合物: ##STR1## 其中R1是氢或保护的羧基,R2是氢或保护的
氨基,条件是当R1是氢时,则R2是保护的
氨基,而当R2是氢时,则R1是保护的羧基,R3是氧代、羟基亚
氨基或保护的羟基亚
氨基,R4是氢或卤素,且m是1至3的整数。