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• W2012644295 abstract "Five novel prodrug types of the potent and selective histamine H3-receptor agonist (R)-α-methylhistamine (1) were prepared and pharmacologically tested in vitro as well as in vivo. In particular, an amide of fatty acid, mono- and dicarbamates, an (acyloxy)alkylcarbamate, and a diphthalidyl derivative were synthesized, all of which require initial prodrug activation through an enzyme-catalyzed reaction in contrast to formerly developed azomethine prodrugs which are cleaved by chemical hydrolysis only. Further drug liberation may ensue spontaneously in a cascade to give 1. Since they have diverse stabilities the prodrugs were investigated for drug liberation in vitro under neutral, acidic, and basic conditions at different temperatures as well as with liver homogenates. In vivo investigation of prodrugs after oral administration to mice proved that the fatty amide 2, the Nα-methylcarbamate 4a, and the Nα-(1-(acetyloxy)ethylcarbamate) 5 showed moderate to high plasma levels of 1. Compound 5 displayed even more than 2.5 times the AUC for 1 than that of the reference azomethine prodrug BP2.94 in the periphery and also displayed a detectable drug level in the central nervous system. It was shown that prodrug approaches based on an initial enzyme-catalyzed liberation step are successfully applicable to different pro-moieties for improved bioavailability and prolonged half-live. These approaches may also be used for other aminergic compounds of this class to optimize pharmacokinetic behavior." @default.
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• W2012644295 date "2001-01-01" @default.
• W2012644295 modified "2023-09-27" @default.
• W2012644295 title "Enzyme-catalyzed prodrug approaches for the histamine H3-receptor agonist (R)-α-methylhistamine" @default.
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• W2012644295 doi "https://doi.org/10.1016/s0968-0896(00)00237-6" @default.
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