CS(O[C:6]1[CH:11]=[CH:10][C:9]([Br:12])=[CH:8][C:7]=1[CH:13]([CH3:15])[CH3:14])(=O)=O.C1(P(C2C=CC=CC=2)CCCP(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(N(CC)CC)C.CS(C)=O.[C:56]([O:59][CH2:60]C)(=[O:58])C>CO.C([O-])(=O)C.[Pd+2].C([O-])(=O)C.O>[Br:12][C:9]1[CH:10]=[CH:11][C:6]([C:56]([O:59][CH3:60])=[O:58])=[C:7]([CH:13]([CH3:15])[CH3:14])[CH:8]=1
A mixture of 4-bromo-2-isopropylphenyl methanesulfonate (0.71 g), palladium acetate (0.023 g), 1,3-bis(diphenyl-phosphino)propane (0.042 g) and triethylamine (0.63 mL) in methanol (6 mL)/dimethylsulfoxide (9 mL) was stirred overnight at 55° C. under an atmosphere of carbon monoxide. Water and ethyl acetate were added to the reaction mixture. The organic layer was separated, washed with water and brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (eluent: diethyl ether/n-hexane=1/10) to afford the title compound (0.355 g).
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