Hydroxyamine hydrochloride → HCID 13732605, compound

Participants

Reaction Steps

1-Ethyl-4-hydroxy-5-(4-methoxybenzoyl)-1H-pyrazolo[3,4-b]pyridine (3.60 g) was refluxed overnight in 30 ml of pyridine containing 4.0 g of hydroxylamine hydrochloride. At the end of this time the pyridine was evaporated and the residue triturated with 5% hydrochloric acid. The product obtained in this manner was chromatographed silica gel (5% methanol/dichloromethane) to remove a fluorescent impurity. Combination of the appropriate fractions and recrystallization from dichloromethane/hexane gave 2.95 g of pure product, mp 156°-157° C.

Provenance & Evidence