反应详情

To a vigorously stirring mixture of NaH (300 mg, 12.5 mmol) in DMSO (30 mL) at ambient temperature under an argon (g) atmosphere was added (CH3)3S(I)O (2.50 g, 11.4 mmol) in small portions over 1 min. Following complete addition, the reaction was stirred for 50 min before the rapid dropwise addition of DMSO (10 mL) solution of 10A (1.57 g, 5.68 mmol). After ca. 50 h the reaction was quenched with H2O (80 mL) and extracted into EtOAc (75 mL). The phases were separated and the aq. phase was further extracted with EtOAc (2×70 mL). The combined organics were washed with H2O (15 mL), brine (15 mL), dried over MgSO4, filtered and concentrated under reduced pressure. The resulting gum was subjected to flash chromatography (SiO2—40 g; gradient elution: 1% MeOH/DCM for 3 min then 1%-5% MeOH/DCM over 20 min at 40 mL/min) to afford 947 mg 10B (57% yield). m/z (ES+) M+1=291.3; HPLC tR=1.52 min. 1H NMR (500 MHz, CDCl3) δ 7.07 (dd, J=8.7, 5.3 Hz, 2H), 6.96 (t, J=8.7 Hz, 2H), 3.63 (dd, J=14.5, 5.0 Hz, 4H), 2.71 (ddd, J=13.0, 6.7, 6.6 Hz, 1H), 2.57-2.44 (m, 4H), 1.90 (ddd, J=8.3, 5.4, 4.3 Hz, 1H), 1.68-1.56 (m, 2H), 1.21 (ddd, J=8.4, 6.3, 4.3 Hz, 1H), 1.04 (d, J=6.4 Hz, 6H).

1. additionaddition
2. customAfter ca. 50 h the reaction was quenched with H2O (80 mL)
3. extractionextracted into EtOAc (75 mL)
4. customThe phases were separated
5. extractionthe aq. phase was further extracted with EtOAc (2×70 mL)
6. washThe combined organics were washed with H2O (15 mL), brine (15 mL)
7. dry with materialdried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure
10. washgradient elution