Nitrogen → HCID 69260340, compound

Participants

Reaction Conditions

Reaction Steps

To a N2-purged solution of tert-butyl (1-(5-fluoropyridin-3-yl)-3-vinyl-1H-pyrazol-4-yl)(methyl)carbamate (0.730 g, 2.293 mmol) in methanol (15.29 ml) was added 10% palladium on carbon (0.036 g, 0.339 mmol). The reaction was purged with hydrogen and run under 80 psi of hydrogen at room temperature for 60 hours. The reaction gave less than 20% conversion. The reaction mixture was filtered through celite, concentrated, and redissolved in ethyl acetate (4 mL) and transferred to a bomb. The reaction was heated at 50° C. at 600 psi of hydrogen for 20 hours. The reaction was only 50% complete. Methanol (1 mL) and 10% palladium on carbon (36 mg) were added, and the reaction was heated at 80° C. at 650 psi of hydrogen for 20 hours. The reaction was filtered through celite and concentrated to give tert-butyl (3-ethyl-1-(5-fluoropyridin-3-yl)-1H-pyrazol-4-yl)(methyl)carbamate (616 mg, 1.923 mmol, 84% yield) as yellow oil: IR (thin film) 1692 cm−1; 1H NMR (300 MHz, CDCl3) δ 8.71 (t, J=1.4 Hz, 1H), 8.35 (d, J=2.6 Hz, 1H), 7.83 (dt, J=9.5, 2.3 Hz, 2H), 3.18 (s, 3H), 2.65 (q, J=7.5 Hz, 2H), 1.44 (s, 9H), 1.25 (t, J=7.1 Hz, 3H); EIMS m/z 320.

Provenance & Evidence