Diisopropylethylamine → 4-Nitrophenyl 1-(6-oxo-1,6-dihydropyridazin-3-yl)piperidin-4-yl carbonate

Participants

Reaction Conditions

Reaction Steps

To a solution of 6-(4-hydroxypiperidin-1-yl)pyridazin-3(2H)-one (3.9 g, 20 mmol) in pyridine (10 mL) was added DIPEA (3.87 g, 30.0 mmol) and 4-nitrophenyl carbonochloridate (6.03 g, 30 mmol) and the resulting mixture was stirred at 30° C. for 2 h. The mixture was concentrated under reduced pressure and the residue was purified by silica gel chromatography (DCM to DCM/MeOH=20/1) to afford the title compound (3.3 g, 46%) as a white solid. [LCMS: Rt=1.47 min, m/z 361.1 (M+H)]+.

Provenance & Evidence