Methyl chloroformate → [2-(2,6-Dichlorophenyl)-2H-pyrazolo[4,3-c]pyridine-4-yl]carbamic acid methyl ester

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Reaction Steps

DIPEA (51 μL, 0.3 mmol) and then methyl chloroformate (19 μL, 0.25 mmol) were added to a solution of 2-(2,6-dichlorophenyl)-2H-pyrazolo[4,3-c]pyridine-4-ylamine (60 mg, 0.21 mmol) in DCM (2 mL). The reaction was stirred at room temperature until completion as determined by TLC. The mixture was partitioned between DCM and water. The organic layer was washed with brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel flash chromatography (40-50% ethyl acetate in cyclohexane) to afford the title compound as a white solid (35 mg, 49% yield). 1H NMR (400 MHz, DMSO-d6): δ 9.54 (d, J=0.9 Hz, 1H), 7.97 (d, J=7.3 Hz, 1H), 7.86 (d, J=1.4 Hz, 1H), 7.84 (d, J=0.6 Hz, 1H), 7.80-7.78 (m, 1H), 7.72 (dd, J=7.3, 0.9 Hz, 1H), 3.97 (s, 3H). LCMS (Method B): RT=2.71 min, m/z: 337 [M+H+].

Provenance & Evidence