| abstract |
1-sulfo-2-oxoazetidine derivatives represented by the following general formula I: (FORMULA) (where R1 represents an optionally acylated or protected amino group, X represents a hydrogen atom or a methoxy group, and R4 represents an azido group or a group represented by (FORMULA) (or) R5 represents an organic residue, and n represents 0.1 or 2)), and their preparation process illustrated below :) (FORMULA) will be made in the formula (or R2 represents an amino acyl or protected group, R3 represents an amino acyl group and R1 and R4 are as defined above). |