3-(5-Methyl-1,3,4-thiadiazol-2-yl)thiomethyl-7-[2-(2-tert-pentyloxycarbonylamino-1,3-thiazol-4-yl)glyoxylamido]-3-cephem-4-carboxylic acid → 3-(5-Methyl-1,3,4-thiadiazol-2-yl)thiomethyl-7-[2-(2-amino-1,3-thiazol-4-yl)glyoxylamido]-3-cephem-4-carboxylic acid

Participants

Reaction Steps

A solution of 3-(5-methyl-1,3,4-thiadiazol-2-yl)thiomethyl-7-[2-(2-tert-pentyloxycarbonylamino-1,3-thiazol-4-yl)glyoxylamido]-3-cephem-4-carboxylic acid, which can be represented as 3-(5-methyl-1,3,4-thiadiazol-2-yl)thiomethyl-7-[2-(2-tert-pentyloxycarbonylimino-2,3-dihydro-1,3-thiazol-4-yl)glyoxylamido]-3-cephem-4-carboxylic acid, (8.56 g.) in formic acid (180 ml.) was stirred for 5.5 hours at room temperature. After the reaction, the reaction mixture was post-treated in the similar manners as in Examples 16 to 17 to give 3-(5-methyl-1,3,4-thiadiazol-2-yl)thiomethyl-7-[2-(2-amino-1,3-thiazol-4-yl)glyoxylamido]-3-cephem-4-carboxylic acid, which can be represented as 3-(5-methyl-1,3,4-thiadiazol-2-yl)thiomethyl-7-[2-(2-imino-2,3-dihydro-1,3-thiazol-4-yl)glyoxylamido]-3-cephem-4-carboxylic acid, (2.6 g.), mp. 156° to 160° C. (dec.).

Provenance & Evidence