Acetone → HCID 131716388, compound

Participants

Reaction Steps

To a solution of benzhydryl 7β-(2-hydroxybenzylideneamino)-3-(3-formamido-2-methyl-1-pyrazolio)methyl-3-cephem-4-carboxylate iodide (510 g) in methylene chloride (1275 ml) and formic acid (1275 ml) was added 35% hydrochloric acid (145 g) at 20°~25° C. The mixture was stirred for 1 hour at 20°~25° C. and added dropwise into the mixture of acetone (1020 ml) and ethyl acetate (2040 ml) at the same temperature. The resulting precipitate was collected by filtration and dried in vacuo to give the mixture (255.9 g) of 7β-amino-3-(3-formamido-2-methyl-1-pyrazolio)methyl-3-cephem-4-carboxylate hydrochloride and 7β-amino-3-(3-amino-2-methyl-1-pyrazolio)methyl-3-cephem-4-carboxylate hydrochloride. The mixture (255.9 g) was dissolved in methanol (1023.6 ml). To the solution was added 35% hydrochloric acid (66.6 g) and the mixture was stirred for 1 hour at 28°~30 ° C. The insoluble material was filtered off and washed with methanol (512 ml). The combined filtrates and washings were added dropwise into the mixture of acetone (2560 ml) and ethyl acetate (5120 ml) at 20°~25° C. The resulting precipitate was collected by filtration and dried in vacuo to give 7β-amino-3-(3-amino-2-methyl-1-pyrazolio)methyl-3-cephem-4-carboxylate hydrochloride.

Provenance & Evidence