Formic Acid → HCID 21875923, compound

Participants

Reaction Steps

To a stirred solution of 2-{4-[(4-methyl-3,5-dinitro-2-pyridinyl)amino]phenyl}ethanol (step 1, 4.2 g, 13.1 mmol), triethylamine (9.6 mL, 68.9 mmol), 10% Pd—C (624 mg, 0.59 mmol) in acetonitrile (14 mL) was added dropwise a solution of formic acid (2.3 mL, 61.0 mmol) in acetonitrile (6.2 mL) at 0° C. over a period of 30 min. After stirring at room temperature for 5 h, the mixture was filtered through a pad of Celite, and the filtrate was concentrated. The residue was dissolved in dichloromethane (100 mL). The solution was washed with 1N aqueous NaOH (50 mL), brine (50 mL), dried (MgSO4), and concentrated. Purification by flash column chromatography on silica gel eluting with hexane/ethyl acetate (gradient elution from 1:1 to 1:2) afforded 2.2 g (60%) of the title compound as red crystals: 1H-NMR (CDCl3) δ 8.42 (1H, s), 7.42 (2H, d, J=8.4 Hz), 7.21 (2H, d, J=8.4 Hz), 6.7 (1H, br s), 3.85 (2H, t, J=6.4 Hz), 2.86 (2H, t, J=6.6 Hz), 2.47 (3H, s).

Provenance & Evidence