Daunorubicin Hydrochloride → Daunorubicin

Participants

Reaction Steps

A solution of 1.13 g (2.0 mmole) of daunomycin hydrochloride and 0.85 g (4.0 mmole) of 4-phenylbenzhydrazide in 75 ml of methanol was stirred at room temperature in the dark for 4 days. After concentrating to about 10 ml, the reaction mixture was stirred and slowly diluted with 100 ml of acetonitrile. The resulting precipitate was collected and washed with 3 × 5 ml of acetonitrile to afford 1.174 g of the hydrazone (I) with a small amount of 4-phenylbenzhydrazide. The mother liquors were evaporated; the residue was dissolved in 5 ml of methanol and the stirred solution was diluted with 75 ml of acetonitrile to give an additional 0.211 g of (I). The two crops of (I) were combined and dissolved in 5 ml of methanol; the solution was stirred and 75 ml of acetonitrile were added dropwise. The resulting precipitate was triturated in the methanol-acetonitrile mixture overnight and then collected, washed with acetonitrile and dried at room temperature/0.1 mm/15 hr to yield the hydrazone hydrochloride (I), 1.253 g (81%) mp 205°-208° decomposed.

Provenance & Evidence