Acetic Acid → tert-butyl 4-(3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-1,4-diazepane-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl 4-(5-formyl-6-hydroxypyridin-2-yl)-1,4-diazepane-1-carboxylate (225 mg, 0.7 mmol) in 3 mL of EtOH were treated with piperidine (119.2 mg, 1.4 mmol), acetic acid (252 mg, 4.2 mmol) and ethyl 2-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)acetate (196 mg, 0.84 mmol) at room temperature. The reaction mixture was stirred in microwave reactor at 150° C. for 2 hours. The mixture was concentrated, quenched with a saturated NaHCO3 solution and extracted with dichloromethane three times. The combined organic layers were combined and concentrated. The residue was purified on silica gel to provide tert-butyl 4-(3-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)-2-oxo-2H-pyrano[2,3-b]pyridin-7-yl)-1,4-diazepane-1-carboxylate after concentration. MS m/z 491 [M+H]+.

Provenance & Evidence