反应详情

Conc. hydrochloric acid (4.09 g) was added to a solution of benzhydryl 7β-tert-butoxycarbonylamino-3-(2-methyl-1-pyrazolio)methyl-3-cephem-4-carboxylate iodide (27 g) in formic acid (108 ml), and stirred at ambient temperature for 2.5 hours. The reaction mixture was added to a mixture of acetone (720 ml) and ethyl acetate (1440 ml). The precipitates were collected by filtration and successively washed with ethyl acetate to give 7β-amino-3-(2-methyl-1-pyrazolio)methyl-3-cephem-4-carboxylate·hydrochloride·hydroiodide (15.3 g).

1. filtrationThe precipitates were collected by filtration
2. washsuccessively washed with ethyl acetate