[CH3:1][N:2]([CH2:15][CH2:16][N:17]1[CH2:22][CH2:21][O:20][CH2:19][CH2:18]1)[S:3]([C:6]1[CH:10]=[CH:9][S:8][C:7]=1[C:11]([O:13]C)=[O:12])(=[O:5])=[O:4].C1COCC1.[OH-].[Li+]>O>[CH3:1][N:2]([CH2:15][CH2:16][N:17]1[CH2:22][CH2:21][O:20][CH2:19][CH2:18]1)[S:3]([C:6]1[CH:10]=[CH:9][S:8][C:7]=1[C:11]([OH:13])=[O:12])(=[O:5])=[O:4]To a solution of methyl 3-(N-methyl-N-(2-morpholinoethyl)sulfamoyl)-thiophene-2-carboxylate (Int. 47) (510 mg, 1.464 mmol) in a 1:1 mixture of THF and H2O, lithium hydroxide (351 mg, 14.64 mmol) was added, and the mixture was stirred at RT overnight. The organic solvent was evaporated and the aqueous residue was acidified with 2N HCl (pH=7); the precipitate was collected by filtration affording 3-(N-methyl-N-(2-morpholinoethyl)-sulfamoyl)thiophene-2-carboxylic acid (Int. 48) (410 mg, 1.226 mmol, MS/ESI+334.9 [MH]+).
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