“…The organic layer was washed with saturated Na 2 CO 3 , H 2 O, and brine, dried over Na 2 SO 4 , and concentrated in vacuo. The residue was chromatographed on silica gel with EtOAc/n-hexane (1:2) to afford 14 (20.0 mg, 69%) as a yellow oil: 1 H NMR (600 MHz, CDCl 3 ) δ 6.33 (1H, s), 5.20 (2H, s), 3.79−3.76 (1H, m), 3.77 (3H, s), 3.49 (3H, s), 2.87 (1H, dd, J = 16.8, 5.4 Hz), 2.65 (1H, dd, J = 17.4, 6.0 Hz), 2.46 (3H, s), 1.75 (1H, d, J = 7.2 Hz), 1.33 (3H, s), 1.31 (3H, s); 13 1-(3,5-Dihydroxy-7-methoxy-2,2-dimethylchroman-8-yl)ethanone. To a solution of 14 (20.0 mg, 0.06 mmol) in anhydrous MeOH (1.5 mL) was added 3 N HCl (0.3 mL), and the mixture was refluxed for 1.0 h under N 2 .…”