反应详情

Gatifloxacin form Y can be made by providing a slurry of gatifloxacin-HCl in acetonitrile:water (90:10, v:v, ca. 16.7% w/v) at about 5° C.; combining the suspension with a volume of aqueous NaOH (e.g. 47%) sufficient to neutralize at least about 70 mole % of the hydrochloride (i.e. convert it to the free base); and isolating solid gatifloxacin from the resulting suspension. The isolated (recovered) gatifloxacin is washed with acetonitrile:water (90:10) and dried at a temperature of about 50° C. at reduced pressure.