C(Cl)(=O)C(Cl)=O.CS(C)=O.[O:11]1[C:19]2[CH2:18][CH2:17][N:16]([S:20]([C:23]3[CH:30]=[CH:29][C:26]([CH2:27][OH:28])=[CH:25][CH:24]=3)(=[O:22])=[O:21])[CH2:15][C:14]=2[CH:13]=[CH:12]1.C(N(CC)CC)C>ClCCl>[O:11]1[C:19]2[CH2:18][CH2:17][N:16]([S:20]([C:23]3[CH:30]=[CH:29][C:26]([CH:27]=[O:28])=[CH:25][CH:24]=3)(=[O:22])=[O:21])[CH2:15][C:14]=2[CH:13]=[CH:12]1To a solution of 4.27 g (33.6 mmol) of oxalyl chloride in 100 ml of dichloromethane, 4.78 ml (67.3 mmol) of dimethyl sulfoxide was added dropwise at -78° C., followed by stirring for 5 minutes. To this solution, a solution of 6.580 g (22.431 mmol) of 4-(6,7-dihydro-4H-furo[3,2-c]pyridin-5-ylsulfonyl)benzyl alcohol in 50 ml of dichloromethane was added at -78° C., followed by stirring for 15 minutes. To this mixture, 18.8 ml (135 mmol) of triethylamine was added; the mixture was allowed to warm to room temperature. After the reaction mixture was washed with water, the water layer was re-extracted with diethyl ether. 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=6/1 to 3/1 to 2/1) to yield the desired product.
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