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温度

0 °C

To a stirred solution of compound 18 (100 mg, 0.25 mmol) in dry THF (5 mL) was added diethyl zinc (1M solution in hexane, 2.5 mL) at 0° C. under nitrogen atmosphere followed by diiodomethane (667 mg, 2.5 mmol). The reaction was stirred at 0° C. for 6 h and poured over cold aqueous solution of ammonium chloride. The organic layer was separated and the aqueous layer extracted repeatedly with EA. The combined organic layer was washed with brine, dried over Na2SO4, filtered and concentrated. The crude product was purified by Prep-TLC to afford the compound 20 (32 mg, 31% yield). 1H NMR (500 MHz, CDCl3) δ 8.94 (m, 1H), 8.47 (d, J=7.5 Hz, 1H), 8.13 (d, J=8.0 Hz, 1H), 7.93 (d, J=8.5 Hz, 1H), 7.55 (t, J=8.0 Hz, 1H), 7.43 (dd, J=8.0 Hz, 4.0 Hz 1H), 7.17 (d, J=7.5 Hz, 1H), 6.98 (t, J=7.5 Hz, 1H), 6.89 (m, 1H), 6.80 (d, J=7.5 Hz, 1H), 5.07 (d, J=15.5 Hz, 1H), 4.95 (d, J=15.0 Hz, 1H), 4.86 (d, J=15.5 Hz, 1H), 4.60 (d, J=15.0 Hz, 1H), 4.49 (m, 1H), 4.14 (d, J=12.0 Hz, 1H), 3.75 (d, J=12.0 Hz, 1H), 1.71 (m, 1H), 1.10 (m, 1H), 0.63 (m, 1H), 0.33 (m, 2H), −0.11 (m, 2H). MS (ESI+) m/z: 409 [M+H]+. LCMS (m/z): 409.2 (MH+).

1. customThe organic layer was separated
2. extractionthe aqueous layer extracted repeatedly with EA
3. washThe combined organic layer was washed with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude product was purified by Prep-TLC