Hydrazine → 3-bromo-4-[(2,4-difluorobenzyl)oxy]-1-[5-(5-hydroxy-1H-pyrazol-3-yl)-2-methylphenyl]-6-methylpyridin-2(1H)-one

Participants

Reaction Conditions

Reaction Steps

To a mixture of ethyl 3-{3-[3-bromo-4-[(2,4-difluorobenzyl)oxy]-6-methyl-2-oxopyridin-1(2H)-yl]-4-methylphenyl}-3-oxopropanoate (from Step 1) (0.20 g, 0.37 mmol) in EtOH (5.00 mL) was added hydrazine hydrate (0.01 mL, 0.41 mmol). The reaction mixture was heated at 60° C. with a condensere. After 1 h, additional hydrazine hydrate (0.01 mL) was added. After 2 h, acetic acid (2 drops) was added. At 4 h, additional hydrazine was added (0.1 mL). At 5 h, the reaction appeared to be complete. Left in fridge overnight. Precipitate filtered, washed with hexane, found to be product, a white solid (0.10 g, 54%). 1H NMR (CD3OD/400 MHz) δ 7.66 (m, 2H), 7.45 (m, 2H), 7.05 (t, 2H, J=9.6 Hz), 6.65 (s, 1H), 5.36 (s, 2H), 2.04 (s, 3H), 2.02 (s, 3H). ESHRMS m/z 502.0552 and 504.0569 (M+H calculated for C23H19BrF2N3O3 requires 502.0572 and 504.0555).

Provenance & Evidence