[O:1]1[C:5]2[CH2:6][N:7]([S:10]([C:13]3[CH:20]=[CH:19][C:16]([CH:17]=[O:18])=[CH:15][CH:14]=3)(=[O:12])=[O:11])[CH2:8][CH2:9][C:4]=2[CH:3]=[CH:2]1.[Cl-].[NH4+]>O1CCCC1.C1([Mg]Br)C=CC=CC=1>[O:1]1[C:5]2[CH2:6][N:7]([S:10]([C:13]3[CH:20]=[CH:19][C:16]([CH:17]([C:13]4[CH:20]=[CH:19][CH:16]=[CH:15][CH:14]=4)[OH:18])=[CH:15][CH:14]=3)(=[O:12])=[O:11])[CH2:8][CH2:9][C:4]=2[CH:3]=[CH:2]1To a solution of 0.142 g (0.487 mmol) of 4-(5,7-dihydro-4H-furo[2,3-c]pyridin-6-ylsulfonyl)benzaldehyde in 30 ml of tetrahydrofuran, phenylmagnesium bromide in tetrahydrofuran (prepared from 2.0 g of bromobenzene and 0.31 g of magnesium in 30 ml of tetrahydrofuran) was added at room temperature until the starting material disappeared on thin-layer chromatography (TLC). To the reaction mixture, aqueous ammonium chloride was added, followed by stirring and 3 extractions with ethyl acetate. The combined organic layer was dried over anhydrous magnesium sulfate; the solvent was distilled off under reduced pressure. The resulting crude product was purified by silica gel column chromatography (hexane/ethyl acetate=3/1 to 2/1) to yield the desired product.
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