4-Toluenesulfonyl chloride → 3-Methylthiomethyl-7-[2-(2-amino-4-thiazolyl)-2-{2-bromoethoxyimino}-acetamido]-ceph-3-eme-4-carboxylic acid

Participants

Reaction Steps

Using the procedure of Example 17, 1.909 g of the syn isomer of 2-(2-tritylamino-4-thiazolyl)-2-(2-bromoethoxyimino)-acetic acid (described in French Pat. No. 2,438,050), 0.68 g of tosyl chloride, 0.927 g of 3-methylthiomethyl-7-amino-ceph-3-eme-4-carboxylic acid and 15 ml of 67% aqueous formic acid were reacted to obtain 0.615 g of pure syn isomer of 3-methylthiomethyl-7-[2-(2-amino-4-thiazolyl)-2-{2-bromoethoxyimino}-acetamido]-ceph-3-eme-4-carboxylic acid with a melting point of 185° C. (decomposition).

Provenance & Evidence