[OH:1][C:2]1[CH:10]=[CH:9][C:8]([S:11](=[O:14])(=[O:13])[NH2:12])=[CH:7][C:3]=1[C:4]([OH:6])=[O:5].[CH:15]1N=CN(C(N2C=NC=C2)=O)C=1.CO>C1COCC1>[CH3:15][O:5][C:4](=[O:6])[C:3]1[CH:7]=[C:8]([S:11](=[O:14])(=[O:13])[NH2:12])[CH:9]=[CH:10][C:2]=1[OH:1]To 62 mmol 2-hydroxy-5-sulfamoyl-benzoic acid in 80 ml THF was added 80 mmol CDI and the mixture heated at 50° C. for 1 h. 616 mmol methanol was then added, and the mixture was heated at 50° C. for 16 h. The mixture was then cooled to room temperature, concentrated in vacuo, and the residue chromatographed on silica gel (eluant: dichloromethane/methanol 20:1). The product containing fractions were concentrated in vacuo and the residue suspended in ethyl acetate and washed with aq NaHCO3 solution. The organic phase was dried with Na2SO4 and concentrated in vacuo to afford the title compound. MS (m/e): 230.2 ([M−H]−, 100%)
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