Hydrogen Peroxide → HCID 178437884, compound

Participants

Reaction Steps

A mixture of 1-cyclopentyl-3-ethyl-4-cyano-5-[(4-pyridinylmethyl)carbonylamino]-1H-pyrazole (2.8 g, 8.6 mmol), ethanol (50 ml), NaOCH3 (1.0 g, 18 mmol) and 30% H2O2 (4.5 ml) was stirred at room temperature for 20 minutes, then was heated at reflux for 3.5 hours. Additional 30% H2O2 (3 ml) was added and the reaction mixture was heated at reflux for 2 more hours. The reaction mixture was concentrated in vacuo, the residue was partitioned between CHCl3 (100 ml) and 10% aqueous NaHCO (50 ml), and the organic layer was separated. The organic layer was concentrated in vacuo, and the residue was crystallized from cyclohexane and a solid was collected by filtration. The filtrate was concentrated in vacuo and the residue was purified by column chromatography on silica gel eluting with ether to 10% methanol/ether, followed by recrystallization from ether, to afford 420 mg of 1-cyclopentyl-3-ethyl-6-(4-pyridinylmethyl)pyrazolo[3,4-d]pyrimidin-4-one, m.p. 162°-164° C.

Provenance & Evidence