反应详情

A solution of 2.5 g of mesitylenesulfonic acid dihydrate in 20 ml of ethyl acetate was added to a solution of 5.93 g of pivaloyloxymethyl 7-[2-(2-aminothiazol-4-yl)-2-(syn)-methoxyiminoacetamido]-3-[2-(5-methyl-1,2,3,4-tetrazolyl)methyl]-Δ3 -cephem-4-carboxylate in 50 ml of ethyl acetate. The deposited crystals were collected by filtration, washed with ethyl acetate and dried to obtain 7.39 g (yield 93.2%) of mesitylenesulfonic acid salt of pivaloyloxymethyl 7-[2-(2-aminothiazol-4-yl)-2-(syn)-methoxyiminoacetamido]-3-[2-(5-methyl-1,2,3,4-tetrazolyl)methyl]-Δ3 -cephem-4-carboxylate having a melting point of 218°-220° C. (decomp.).

1. filtrationThe deposited crystals were collected by filtration
2. washwashed with ethyl acetate
3. customdried