反应详情

To a solution of 8-cyclopentyl-6-(2-ethoxy-ethoxy)-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one (289 mg, 0.83 mmol) in chloroform (5 mL) was added 2-benzenesulfonyl-3-phenyl-oxaziridine (281 mg, 1.07 mmol). The reaction mixture was stirred at RT overnight, under nitrogen. The solvents were removed and the crude product was chromatographed on silica gel, eluting with a 5% methanol-ethyl acetate/hexane gradient to give 8-cyclopentyl-6-(2-ethoxy-ethoxy)-2-methanesulfinyl-8H-pyrido[2,3-d]pyrimidin-7-one as a clear oil (210 mg, 0.56 mmol). 1H NMR δ (400 MHz, CDCl3) 8.84 (s, 1H), 6.89 (s, 1H), 6.06–5.98 (m, 1H), 4.23 (t, J=4.0 Hz, 2H), 3.89 (t, J=4.0 Hz, 2H), 3.60 (q, J=6.9 Hz, 2H), 2.95 (s, 3H), 2.28–2.19 (m, 2H), 2.15–2.10 (m, 2H), 1.97–1.88 (m, 2H), 1.71–1.64 (m, 2H), 1.21 (t, J=6.9 Hz, 3H); MS (APCI+) 350 (M+1).

1. customThe solvents were removed
2. customthe crude product was chromatographed on silica gel
3. washeluting with a 5% methanol-ethyl acetate/hexane gradient