反应详情

3-Oxo-2,3-dihydro-pyridazine-4-carbonitrile (1 g, 8.26 mmol) was heated in a mixture of ethanol (2 ml) and conc. H2SO4 (1.1 ml) to 100° C. (oil-bath temperature) overnight. The reaction mixture was then allowed to cool to ambient temperature, poured onto ice and carefully neutralized with solid Na2CO3. The mixture was extracted three times with CHCl3 and the combined extracts were dried (Na2SO4) and evaporated. The remaining residue was then purified by column chromatography (silica gel, heptane/ethyl acetate 70:30 to 35:65) to give the title compound (433 mg, 2.58 mmol; 31%) as white solid. MS: m/e=169.1 [M+H+].

1. additionpoured onto ice
2. extractionThe mixture was extracted three times with CHCl3
3. dry with materialthe combined extracts were dried (Na2SO4)
4. customevaporated
5. customThe remaining residue was then purified by column chromatography (silica gel, heptane/ethyl acetate 70:30 to 35:65)