Water → HCID 13749205, compound

Participants

Reaction Steps

Five grams of 4-chloro-1-ethyl-5-(2-methoxybenzoyl)-1H-pyrazolo[3,4-b]pyridine was refluxed for 2 hours in 500 ml of acetic acid containing 15 g of hydroxylamine hydrochloride and 1 g of p-toluenesulfonic acid monohydrate. At the end of this time the reaction mixture was poured into water and extracted with dichloromethane. The organic phase was washed well with water, dried, evaporated and chromatographed over 230-400 mesh silica gel. The appropriate fractions were combined and evaporated to give 2.95 g of product, mp 126°-127° C. The melting point was unchanged after recrystallization from ethyl acetate/pentane.

Provenance & Evidence