6-bromo-2-(methylthio)pyrido[2,3-d]pyrimidin-7(8H)-one → 6-bromo-8-(2-cyclopropyl-6-fluorobenzyl)-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one

Participants

Reaction Steps

To a solution of 6-bromo-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one (7, 2.12 g, 7.8 mmol) in anhydrous dimethylformamide (40 mL) sodium hydride (60% on mineral oil, 467 mg, 11.7 mmol) was added and the reaction was stirred at room temperature for 30 min. A solution of 2-chloromethyl-1-cyclopropyl-3-fluorobenzene (1.58 g, 8.6 mmol) in anhydrous dimethylformamide (10 mL) was added slowly and the reaction was stirred for 18 h. The mixture was poured onto ice water (250 g) and extracted with dichloromethane (3×80 mL). The combined organic layers were dried over magnesium sulfate, filtered and evaporated. The residue was triturated with n-hexane, the precipitated product was collected, washed with methanol, then diethyl ether. The crude product was recrystallized from ethyl acetate to give the title compound (1.31 g, 3.1 mmol, 54%) as a pale yellow solid. ESMS m/z 420 (M+H)+.

Provenance & Evidence