Formaldehyde → HCID 58438397, compound

Participants

Reaction Steps

To a solution of 6-butyl-5-(4-cyclohexyloxy-phenyl)-pyridazine-3-carboxylic acid (1,2,3,6-tetrahydro-pyridin-4-ylmethyl)-amide dihydrochloride (30 mg) in DCM (2 mL) was added formaldehyde solution in water (37%, 1 mL), and stirred for 5 min. Sodium triacetoxyborohydride (0.47 mmol, 0.1 g) was added and stirred at room temperature for 2 h. The reaction was diluted with DCM (5 mL), and the DCM layer was separated and washed with saturated NaHCO3 solution, dried (Na2SO4), filtered and concentrated under reduced pressure. The residue was purified on a SiO2 cartridge with 2% (NH3 in MeOH, 2M) in DCM-6% (NH3 in MeOH, 2M) in DCM to provide 6-Butyl-5-(4-cyclohexyloxy-phenyl)-pyridazine-3-carboxylic acid (1-methyl-1,2,3,6-tetrahydro-pyridin-4-ylmethyl)-amide, which was converted to dihydrochloride salt by treating with 4 N HCl in dioxane (0.5 mL) in DCM (2 mL). The volatiles were removed under reduced pressure, and the salt was washed with anhydrous ether and solid was dried under high vacuum (38 mg). LCMS: m/z 464.1 [M+1]. 1H NMR (400 MHz, CD3OD): δ 8.38 (1H, s), 7.46 (2H, d), 7.12 (2H, d), 5.71 (1H, s), 4.40-4.50 (1H, m), 4.11 (2H, s) 3.88 (1H, d), 3.55-3.70 (2H, m), 3.17-3.28 (3H, m), 2.94 (3H, s), 2.52-2.66 (1H, m), 2.44 (1H, d), 1.97-2.10 (2H, m), 1.75-1.88 (2H, m), 1.25-1.70 (10H, m), 0.84 (3H, t).

Provenance & Evidence