反应详情

The sulfide, 8-cyclopentyl-5-methyl-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one (7.03 g, 25.51 mmol) and iodine (7.12 g, 28.06 mmol) were combined in dry dichloromethane (120 mL). The mixture was shielded from light and stirred at room temperature for 27 minutes. Bis(trifluoroacetoxy)iodobenzene (13.16 g, 30.61 mmol) was added in one portion and the reaction mixture was heated to 37° C. for 2 h, then cooled to room temperature for 2 h. 50% Aqueous (w/v) sodium thiosulfate (114 mL) was added and the two phases were stirred for 30 minutes then separated. The aqueous phase was extracted with dichloromethane (50 mL) and the combined organic phases were washed with 50% aqueous (w/v) sodium thiosulfate (50 mL) and water (4×130 mL). The organic phase was dried, filtered and concentrated in vacuo to give crude product which was purified by chromatography (15% heptane/dichloromethane) to give 8-cyclopentyl-6-iodo-5-methyl-2-methylsulfanyl-8H-pyrido[2,3-d]pyrimidin-7-one (5.94 g, 58%) as a white solid. MS (ESI); M++1: Calc'd, 401. Found 401. 1H NMR δ (300 MHz, CDCl3) 8.91 (s, 1H), 6.12-6.00 (m, 1H), 2.70 (s, 3H), 2.62 (s, 3H), 2.30-2.24 (m, 2H), 2.15-2.08 (m, 2H), 1.93-1.81 (m, 2H), 1.75-1.57 (m, 2H)

1. temperaturethe reaction mixture was heated to 37° C. for 2 h
2. temperaturecooled to room temperature for 2 h
3. stirringthe two phases were stirred for 30 minutes
4. customthen separated
5. extractionThe aqueous phase was extracted with dichloromethane (50 mL)
6. washthe combined organic phases were washed with 50% aqueous (w/v) sodium thiosulfate (50 mL) and water (4×130 mL)
7. customThe organic phase was dried
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customto give crude product which
11. customwas purified by chromatography (15% heptane/dichloromethane)