The rates of reaction for the nonenzymatic conjugation of reduced glutathione and L-cysteine to a series of 5-substituted 1,3,4-thiadiazole- and 1,3,4-thiadiazoline-2-sulfonamides, ring-fused 1,3,4-thiadiazole-2-sulfonamides, and substituted benzenesulfonamides have been measured under simulated physiological conditions. The reactivities toward conjugation at pH 7.5 within two series of 5-substituted 1,3,4-thiadiazole- and 1,3,4-thiadiazoline-2-sulfonamides (methazolamide derivatives) conformed to the Brønsted relationship, the rate of conjugation increasing as sulfonamide pK, decreased. Reaction rate was found to vary from k = 0.07 X 10(-3) min-1 for X (pKa = 7.7) to k = 275 X 10(-3) min-1 for IX (pKa = 7.05). All substituted benzenesulfonamides and several 1,3,4-thiadiazole-2-sulfonamides with pKa values above 9 were unreactive toward conjugation. The data presumably explain the fate of many of these compounds in vivo, for example the fact that acetazolamide (I) is excreted unchanged while methazolamide (XI) and ethoxolamide (XVII) are partially metabolized.
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