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To the suspension of 2 (1.16 g, 3.84 mmol) in WA (38 mL) and water (9 mL), iron (0.64 g, 11.51 mmol) and ammonium chloride (0.41 g, 7.67 mmol) were added and refluxed overnight. After the reaction was filtrated with celite, the solvent was concentrated under reduced pressure to give a brown residue, which was dissolved in CH2Cl2 and quenched with water, followed by extracted with CH2Cl2 (20 mL×3). The combined organic layer was dried over anhydrous MgSO4 and concentrated under reduced pressure to give a brown residue, which was purified by silica gel chromatography (EtOAc:n-hexane=1:2:1% NH3(aq)) to afford 27 (0.86 g). 1H NMR (500 MHz, CD3OD): δ 3.60 (s, 2H), 6.48 (d, J=3.6 Hz, 1H), 6.69 (dd, J=8.7, 2.1 Hz, 1H), 6.76 (d, J=1.8 Hz, 1H), 7.39-7.42 (m, 2H), 7.44 (d, J=3.5 Hz, 1H), 7.49-7.51 (m, 1H), 7.77 (d, J=8.7 Hz, 1H), 7.82 (d, J=7.9 Hz, 2H).

1. additionwere added
2. temperaturerefluxed overnight
3. filtrationAfter the reaction was filtrated with celite
4. concentrationthe solvent was concentrated under reduced pressure
5. customto give a brown residue, which
6. customquenched with water
7. extractionby extracted with CH2Cl2 (20 mL×3)
8. dry with materialThe combined organic layer was dried over anhydrous MgSO4
9. concentrationconcentrated under reduced pressure
10. customto give a brown residue, which
11. customwas purified by silica gel chromatography (EtOAc:n-hexane=1:2:1% NH3(aq))