反应详情

tert-Butyl cyanoacetate (292 mg, 2.07 mmol) was dissolved, under inert atmosphere, in dry DMF (4 ml) and NaH (60% dispersion in mineral oil, 90 mg, 2.24 mmol) was added portionwise. After 15 min, a solution of 1 (400 mg, 1.72 mmol) in dry DMF (3 ml) was added dropwise. After 16 h MeOH was added, the solvents were evaporated and the crude purified by flash chromatography (EtOAc:MeOH 9:1) affording cyano-(2-cyano-9-oxo-9H-indeno[1,2-b]pyrazin-3-yl)-acetic acid tert-butyl ester as dark red solid.

1. customthe solvents were evaporated
2. customthe crude purified by flash chromatography (EtOAc:MeOH 9:1)