反应详情

温度

60 °C

In a 25 mL round bottom flask was placed 6′-bromo-4-hydroxyspiro[cyclohexane-1,2′-inden]-1′(3′H)-one (368 mg, 1.252 mmol) and it was azeotroped twice with acetonitrile (2 mL/each). CuI (24 mg, 0.126 mmol) was added followed by acetonitrile (2.5 mL). This solution was purged under a stream of N2 for 30 seconds. The solution was heated to 60° C. under a nitrogen atmosphere. After being 5 minutes at 60° C., FSO2CF2CO2H (136 mL, 1.316 mmol) was added dropwise. After 1 hour, the reaction was quenched with H2O (10 mL) and diluted with diethyl ether (10 mL). The phases were separated and the aqueous phase was back-extracted with diethyl ether (5 mL). The combined organic phases were dried over Na2SO4, filtered and concentrated under reduce pressure. The crude material was purified by flash chromatography (ISCO, 40 g SiO2 cartridge, ethyl acetate/hexanes as the eluents). The corresponding fractions were combined and concentrated under reduce pressure yielding benzyl 6′-bromo-4-(difluoromethoxy)spiro[cyclohexane-1,2′-inden]-1′(3′H)-one (137 mg, 0.398 mmol, 32% yield). M+H=344.9, 1H NMR (CDCl3, 400 MHz) δ 7.86 (d, J=1.2 Hz, 1H), 7.69 (dd, J=8.0, 1.6 Hz, 1H), 7.33 (d, J=8.4 Hz, 1H), 6.26 (t, J=75.2 Hz, 1H), 4.20 (m, 1H), 2.98 (s, 2H), 2.14 (m, 2H), 1.80 (m, 2H), 1.65-1.52 (m, 4H).

1. customIn a 25 mL round bottom flask was placed
2. customThis solution was purged under a stream of N2 for 30 seconds
3. waitAfter 1 hour
4. customthe reaction was quenched with H2O (10 mL)
5. additiondiluted with diethyl ether (10 mL)
6. customThe phases were separated
7. extractionthe aqueous phase was back-extracted with diethyl ether (5 mL)
8. dry with materialThe combined organic phases were dried over Na2SO4
9. filtrationfiltered
10. concentrationconcentrated
11. customThe crude material was purified by flash chromatography (ISCO, 40 g SiO2 cartridge, ethyl acetate/hexanes as the eluents)
12. concentrationconcentrated