摘要:
The present invention relates to a simple process for producing 2-aminothiazoleacetic acid derivatives useful as intermediates for producing cephalosporin-type antibiotics. The process for producing chloroacetylaminothiazoleacetic acid derivatives represented by the following formula (II) wherein R1 is a protection group for the hydroxyl group, comprises reacting aminothiazoleacetic acid derivatives represented by the following formula (I) wherein R1 is a protection group for the hydroxyl group, with a chloroacetylating agent.