Hydrochloric Acid → HCID 131730537, compound

Participants

Reaction Steps

To a solution of the above pyridazine dihydrochloride (0.5 mmol, 267 mg) in dichloromethane (2.0 mL) was added formaldehyde solution in water (37%, 10 mmol, 1.0 mL), and 2 drops of acetic acid. Then sodium triacetoxyborohydride (10 mmol, 2.12 g) was added. The mixture was stirred at room temperature for 0.5 hour then concentrated. The mixture was then diluted with water/EtOAc, and neutralized with NaHCO3 powder. The organic layers were combined and dried over Na2SO4. The solvent was removed in vacuo, and the residue was purified by silica gel chromatography (DCM to DCM+10% 2N ammonia in MeOH) to give a solid, which was dissolved in DCM (1.0 mL), 2N HCl in ether (1.0 mL) was added, kept at room temperature for 10 min, condensed, triturated with hexanes to provide the title compound (211 mg). LCMS: m/z 477 [M+1]. 1H NMR (400 MHz, CD3OD) δ 7.83 and 7.93 (1H, s), 7.45-7.55 (4H, m), 7.36-7.40 (2H, m), 7.31-7.35 (1H, m), 7.20-7.24 (2H, m), 5.20 (2H, s), 4.59-4.63 (2H, m), 3.63-3.95 (4H, m), 3.44 (3H, s), 2.58-3.23 (9H, m), 1.44-1.53 (2H, m), 1.25-1.33 (2H, m), 0.81 (3H, t).

Provenance & Evidence