Methanol → 5,7-dichloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

Participants

Reaction Steps

5,7-dichloropyrido[4,3-d]pyrimidin-4(3H)-one (1 g, 4.65 mmol) was dissolved in anhydrous DMF 15 mL, and NaH (60% mineral oil, 205 mg, 5.11 mmol) was slowly added into the reaction solution. The reaction was stirred at room temperature for 15 minutes, then CH3I (730 mg, 5.11 mmol) in DMF was added drop-wise into the solution. The reaction was heated to 50° C. for 1 hour and then cooled down to room temperature. Methanol was then added to quench the reaction and the solvent was removed under the vacuum. The crude product was purified by silica column chromatography using hexane/ethyl acetate 1:1 to obtain the final compound 5,7-dichloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one. 1H NMR (DMSO-d6) δ 8.64 (s, 1H), 7.74 (s, 1H), 3.46 (s, 3H); ESI-MS m/z 230.1 (MH+).

Provenance & Evidence