반응 단계
A solution of [6]-shogaol (100 mg, 0.36 mmol) in methanol (5 mL) at 0° C. was treated with a solution of sodium (21 mg, 0.91 mmol) in methanol (1 mL). After 4.0 h, glacial acetic acid (0.5 mL) was added, and the solution was concentrated under reduced pressure. The residue was dissolved in water (5 mL), and extracted with ethyl acetate (5 mL×3). The organic phases were pooled, washed with water (5 mL×2) and brine (5 mL×1), dried over Na2SO4, and evaporated in vacuo. The residue was subjected to preparative TLC (hexane/EtOAc=4:1) to give the title compound M7 as a yellow oil (100 mg, yield 90%); 1H NMR (600 MHz, CDCl3) δ 6.69 (1H, d, J=1.6 Hz, H-2′), 6.82 (1H, d, J=8.1 Hz, H-5′), 6.66 (1H, dd, J=8.1, 1.6 Hz, H-6′), 2.75 (2H, m, H-1), 2.83 (2H, t, J=7.5 Hz, H-2), 2.64 (1H, dd, J=15.7, 7.6 Hz, H-4a), 2.40 (1H, dd, J=15.7, 4.7 Hz, H-4b), 3.66 (1H, m, H-5), 1.48 (1H, m, H-6a), 1.42 (1H, m, H-6b), 1.31-1.25 (6H, m, ranged from H-7 to H-9), 0.88 (3H, t, J=7.1 Hz, H-10), and 3.87 (3H, s, OMe-3′); positive APCIMS, m/z 309 [M+H]+.
