反应详情

To a dry 200 mL flask equipped with magnetic stirrer, and reflux condenser was charged 3.7 g ethyl 4-(5-chloropyridin-2-yl)-4-oxobutanoate (0.0153 mol), 75 mL ethanol, and 0.8 g of hydrazine hydrate (0.0168 mol). The reaction was heated at reflux for about 2 hours. An aliquot was analyzed by GC which indicated no remaining starting material, and one major product. The reaction was cooled and poured into about 200 mL of water to afford a tan solid which was collected by vacuum filtration, washed with water, hexane, and dried overnight in vacuo at 40° C. Isolated 2.6 g of a tan solid. The NMR data is as follows: 300 MHz 1H NMR (CDCl3, TMS=0 ppm) 2.65 (t, 2H); 3.22 (t, 2H), 7.75 (d, 1H); 8.00 (d, 1H); 8.60 (s, 1H); 8.70 (bs, 1H). The sample was stored in the refrigerator and had 81% isolated yield.

1. customTo a dry 200 mL flask equipped with magnetic stirrer
2. temperaturereflux condenser
3. temperatureThe reaction was heated
4. temperatureat reflux for about 2 hours
5. temperatureThe reaction was cooled
6. customto afford a tan solid which
7. filtrationwas collected by vacuum filtration
8. washwashed with water, hexane
9. customdried overnight in vacuo at 40° C