反应详情

To a solution of 2-chloro-6-diformylaminomethylnicotinic acid methyl ester (90.2 g, 0.352 mol) in methanol (530 mL) was added water (8 mL, 0.44 mol) and formic acid (27.6 mL, 0.73 mol) before the reaction mixture was heated at gentle reflux for 16 hours. The reaction mixture was concentrated in vacuo and the residue dissolved in ethyl acetate (400 mL). The resultant solution was washed with water (400 mL) and the aqueous layer extracted with ethyl acetate (2×200 mL). The combined organic extracts were washed with brine (300 mL), dried (MgSO4) and concentrated in vacuo to yield the title compound as an orange oil which solidified on standing (79.78 g, 99%). 1H NMR (CDCl3, 400 MHz) 8.34 (1H, s), 8.17 (1H, d, J=8.0 Hz), 7.31 (1H, d, J=7.8 Hz), 6.63 (1H, br s), 4.63 (2H, d, J=5.6 Hz), 3.96 (3H, s).

1. temperaturewas heated
2. temperatureat gentle reflux for 16 hours
3. concentrationThe reaction mixture was concentrated in vacuo
4. dissolutionthe residue dissolved in ethyl acetate (400 mL)
5. washThe resultant solution was washed with water (400 mL)
6. extractionthe aqueous layer extracted with ethyl acetate (2×200 mL)
7. washThe combined organic extracts were washed with brine (300 mL)
8. dry with materialdried (MgSO4)
9. concentrationconcentrated in vacuo