Water → 8-Bromo-6-methyl-2-(1-methylpyrazol-4-yl)pyrido[4,3-d]pyrimidin-5-one

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Reaction Steps

The title compound from step 3 (220 mg, 0.912 mmol) and Br2 (146 mg, 0.912 mmol) in HOAc (15 mL) were stirred at room temperature for 2 h. Water (150 mL) was added, and the resulting solid was collected and triturated with DCM: PE=10:1 (10 mL) to give the title compound (200 mg, yield: 69.0%). 1H NMR (CDCl3, 400 MHz) δ 9.54 (s, 1H), 8.33 (s, 1H), 8.27 (s, 1H), 7.77 (s, 1H), 4.01 (s, 3H), 3.62 (s, 3H).

Provenance & Evidence