Br[C:2]1[CH:11]=[C:10]([S:12](=[O:15])(=[O:14])[NH2:13])[C:5]2[O:6][CH:7]([CH3:9])[CH2:8][C:4]=2[CH:3]=1.C([O-])(=O)C.[Na+]>[Pd].CO>[CH3:9][CH:7]1[O:6][C:5]2[C:10]([S:12](=[O:15])(=[O:14])[NH2:13])=[CH:11][CH:2]=[CH:3][C:4]=2[CH2:8]172.5 g (0.25 mole) of 5-bromo-2,3-dihydro-2-methyl-7-sulfamoylbenzo[b]furan are hydrogenated in the presence of 22.4 g (0.25 mole) of sodium acetate and 7.5 g of 5% palladium on carbon catalyst in 750 ml of methanol. The catalyst is removed, the solvent evaporated, and the residue crystallised from a mixture of water/ethanol, affording 42.3 g (79% of theory) of 2,3-dihydro-2-methyl-7-sulfamoylbenzo[b]furan with a melting point of 174°-177° C.
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