Diethyl Oxalate → 1-(2,4-difluorophenyl)-7-ethyl-1H-pyrazolo[3,4-b]pyrazine-5,6(4H,7H)-dione

Participants

Reaction Conditions

Reaction Steps

A mixture of diethyl oxalate (5.68 mL, 4.20 mmol) and 1-(2,4-difluorophenyl)-N5-ethyl-1H-pyrazole-4,5-diamine (1.00 g, 4.20 mmol) were heated in an oil bath at 150° C. for 18 h. The reaction mixture was cooled to RT and treated with EtOAc (5 mL) and hexanes (15 mL). The precipitated tan solid was filtered and rinsed with 5 mL of ether to afford 1-(2,4-difluorophenyl)-7-ethyl-1H-pyrazolo[3,4-b]pyrazine-5,6(4H,7H)-dione. MS (ES+): 293.1 (M+H)+.

Provenance & Evidence