反应详情

To a suspension of 2-cyclopentyl-7,8-dihydro-6H-thiopyrano[3,2-d]pyrimidin-4-ol (2.9 g, 12.3 mmol) in methylene chloride (100 mL) at 0° C. was added N,N-dimethylaminopyridine (0.020 g, cat.), triethylamine (3.5 mL, 24.6 mmol) and trifluoromethanesulfonic acid (2.3 mL, 13.5 mmol). The suspension was warmed to rt and stirred for 3 h. The mixture was cooled to 0° C. and the reaction was quenched with a saturated solution of NaHCO3. The organic layer was washed a saturated solution of NaHCO3 and brine. The organic layers were dried over anhydrous sodium sulfate, filtered, and the filtrate was concentrated. The residue was purified by column chromatography (silica, hexanes/ethyl acetate) to afford the title compound (3.40 g, 75%) as, a yellow solid. MW=368.40. 1H NMR (CDCl3, 500 MHz) δ 3.28-3.20 (m, 1H), 3.10-3.05 (m, 1H), 2.98 (t, J=6.5 Hz, 2H), 2.31-2.24 (m, 2H), 2.09-1.99 (m, 2H), 1.89-1.76 (m, 4H), 1.70-1.62 (m, 2H); APCI MS m/z 369 [M+H]+.

1. temperatureThe mixture was cooled to 0° C.
2. customthe reaction was quenched with a saturated solution of NaHCO3
3. washThe organic layer was washed a saturated solution of NaHCO3 and brine
4. dry with materialThe organic layers were dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationthe filtrate was concentrated
7. customThe residue was purified by column chromatography (silica, hexanes/ethyl acetate)