[CH3:1][O:2][C:3]1[CH:4]=[C:5]([OH:9])[CH:6]=[CH:7][CH:8]=1.[CH:10]1[CH2:15][CH2:14][CH:13]=[CH:12][CH:11]=1>C(Cl)Cl.C(S([O-])(=O)=O)(F)(F)F.[Ag+]>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]2[CH:10]3[CH2:15][CH2:14][CH2:13][CH2:12][CH:11]3[O:9][C:5]=2[CH:4]=1.[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]2[C:10]3[CH2:15][CH2:14][CH2:13][CH2:12][C:11]=3[O:9][C:5]=2[CH:4]=1A solution of AuCl3 (0.303 g, 1.0 mmol) and AgOTf (0.770 g, 3.0 mmol) was stirred in anhydrous CH2Cl2 (150 mL) for 2 hours. 3-methoxy-phenol (2.48 g, 20 mmol) in CH2Cl2 (25 mL) was added, followed by addition of cyclohexadiene in CH2Cl2 (25 mL) at 40° C. over two hours. The reaction mixture was stirred at 40° C. overnight. The reaction mixture was passed through a silica gel plug. The filtrate was concentrated. The residue was purified by silica gel chromatography (5-30% CH2Cl2/heptane) to give 0.393 g of the title compound and 0.67 g of 7-methoxy-1,2,3,4-tetrahydro-dibenzofuran.
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