Ethanol → Zoledronate disodium tetrahydrate

Participants

Reaction Steps

A solution of sodium hydroxide (1.4 g) in a mixture of water (5% v/v)/Ethanol (95% v/v, 10 volumes per grams of ZLD-Ac form I) (8 ml) was added drop-wise to a suspension of Zoledronic acid form I (5.0 g) in a mixture of water (5% v/v)/Ethanol (95% v/v, 10 volumes per grams of ZLD-Ac) (45 ml) at reflux temperature. The reaction mixture was heated at reflux temperature for additional 19.5 hours. Then the reaction mixture was cooled to room temperature. Further cooling was performed using an ice-bath. The precipitate was then filtered, washed with Ethanol (1×10 ml) and dried in a vacuum oven at 50° C. for 20 hours to give 4.9 g (84%) of Zoledronate disodium crystal form XIII (LOD by TGA=3.4%). Purity by HPLC 99.9%.

Provenance & Evidence