反应详情

To a solution of ethyl (2E)-3-[2-(4-cyanopyridin-2-yl)hydrazinyl]prop-2-enoate (2.0 g, 8.62 mmol) in 30 mL EtOH was added t-BuOK (1.93 g, 17.24 mmol) at 0-5° C. The mixture was stirred for 3 days at rt. The mixture was adjusted to pH=6 with 1 N HCl with cooling. The mixture was extracted with EtOAc (3×100 mL). The organic layers were washed with 200 ml brine, dried over Na2SO4, and concentrated to dryness. The resultant residue was stirred with PE/EtOAc (10/10 mL) for 30 min and filtered to give the title compound (500 mg, 31%) as a red solid. 1H NMR (400 MHz, CDCl3): δ 4.63 (1H, s), 7.12 (1H, dd, J=4.8, 1.2 Hz), 7.16 (1H, s), 8.35 (1H, d, J=4.4 Hz), 8.43 (1H, s). [M+H] Calc'd for C9H6N4O, 187. Found, 187.

1. temperaturewith cooling
2. extractionThe mixture was extracted with EtOAc (3×100 mL)
3. washThe organic layers were washed with 200 ml brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated to dryness
6. stirringThe resultant residue was stirred with PE/EtOAc (10/10 mL) for 30 min
7. filtrationfiltered