Sodium hydride → HCID 22614874, compound

Participants

Reaction Steps

Acetamide oxime (120 mg, 1.62 mmol) followed by sodium hydride (80% w/w dispersion in oil, 8 mg, 0.27 mmol) were added to a stirred suspension of 6,7-dichloro-2,3-dimethoxy-5-[3-ethoxycarbonyl-5-(3-pyridyl)-4H-1,2,4-triazol-4-yl]quinoxaline (Preparation 94, 250 mg, 0.53 mmol) in dry toluene (15 mL) at room temperature under nitrogen. The mixture was heated under reflux for 3.5 hours, cooled and the solution partitioned between ethyl acetate and brine. The aqueous phase was extracted with ethyl acetate (2×20 mL), the combined organic extracts dried (MgSO4) and concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel, by gradient elution using hexane:ethyl acetate (7:3 changing to 1:1, by volume) to give the title compound (210 mg, 82%) as a white solid.

Provenance & Evidence