Aniline → 2-Methoxy-N-phenylpyridine-4-carboxamide

Temperatur

0 °C

To a solution of 2-methoxyisonicotinic acid (2.00 g, 13.06 mmol) in anhydrous tetrahydrofuran (80 mL) was added 4-methyl morpholine (1.84 g, 18.28 mmol). After cooling to 0° C., isobutyl chloroformate (2.31 g, 16.98 mmol) was added to the reaction mixture. The reaction mixture was stirred at ambient temperature for 6 hours, followed by the addition of aniline (1.70 g, 18.28 mmol). The resulting mixture was stirred at ambient temperature for 16 hours. The solvent was removed in vacuo. The residue was dissolved in ethyl acetate (150 mL) and washed with saturated aqueous sodium bicarbonate (2×50 mL) and brine (50 mL). The organic layer was dried over anhydrous sodium sulfate, filtered and the filtrate was concentrated in vacuo to afford 2-methoxy-N-phenylisonicotinamide (2.50 g, 86%) as a colorless solid: 1H NMR (300 MHz, CDCl3) δ 11.85 (s, 1H), 10.31 (s, 1H), 7.75-7.60 (m, 2H), 7.47 (d, J=4.6 Hz, 1H), 7.35-7.20 (m, 2H), 7.12-7.04 (m, 1H), 6.83-6.80 (m, 1H), 6.54-6.42 (m, 1H); MS (ES+) m/z 229.2 (M+1).

1. stirringThe resulting mixture was stirred at ambient temperature for 16 hours
2. customThe solvent was removed in vacuo
3. dissolutionThe residue was dissolved in ethyl acetate (150 mL)
4. washwashed with saturated aqueous sodium bicarbonate (2×50 mL) and brine (50 mL)
5. dry with materialThe organic layer was dried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationthe filtrate was concentrated in vacuo

ORD-Eintrag

ord-9eb82d5b9bf44a4a8ae95a3f9a879e45

Quelldatensatz

uspto-grants-2013_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08501746B2