反应详情

A mixture of 7-[2-(2-formamidothiazol-4-yl)-2-(2-azidoethoxyimino)acetamido]-3-(1-methyl-1H-tetrazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 0.70 g.), 10% palladium carbon (0.85 g.) and acetic acid (10 ml.) was subjected to catalytic reduction under ordinary pressure at room temperature for 13 hours. The resultant mixture was filtered, and the filtrate was concentrated in vacuo. The residue was stirred in diisopropyl ether (30 ml.) and methanol (10 ml.) for an hour. The precipitates were collected by filtration, washed with diisopropyl ether and dried to give 7-[2-(2-formamidothiazol-4-yl)-2-(2-aminoethoxyimino)acetamido]-3-(1-methyl-1H-tetrazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 0.35 g.).

1. filtrationThe resultant mixture was filtered
2. concentrationthe filtrate was concentrated in vacuo
3. waitmethanol (10 ml.) for an hour
4. filtrationThe precipitates were collected by filtration
5. washwashed with diisopropyl ether
6. customdried