合成路线1

Lithiation of 1-(N-N-dimethylsulfamoyl)imidazole (I) followed by reaction with tert-butyldimethylsilyl chloride produced the 2-silyl protected imidazole (II). Further lithiation of (II) allowed the introduction of a bromohexyl group at position 5 upon treatment with 1,6-dibromohexane yielding (III). Bromide (III) was subsequently converted into primary amine (VI) through a Gabriel synthesis involving condensation with potassium phthalimide (IV) with concomitant desilylation, and then hydrazinolysis of the resulting alkylated phthalimide (V). Condensation of amine (VI) with naphthalene-2-sulfonyl chloride (VII) furnished sulfonamide (VIII). The sulfamoyl protecting group of (VIII) was finally removed by hydrolysis with HCl.