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Prodrug thiamine analogs as inhibitors of the enzyme transketolase
Authors:Le Huerou Yvan  Gunawardana Indrani  Thomas Allen A  Boyd Steven A  de Meese Jason  Dewolf Walter  Gonzales Steven S  Han May  Hayter Laura  Kaplan Tomas  Lemieux Christine  Lee Patrice  Pheneger Jed  Poch Gregory  Romoff Todd T  Sullivan Francis  Weiler Solly  Wright S Kirk  Lin Jie
Institution:Array BioPharma Inc., 3200 Walnut Street, Boulder, CO 80301, USA. yhuerou@arraybiopharma.com
Abstract:Transketolase, a key enzyme in the pentose phosphate pathway, has been suggested as a target for inhibition in the treatment of cancer. Compound 5a ('N3'-pyridyl thiamine'; 3-(6-methyl-2-amino-pyridin-3-ylmethyl)-5-(2-hydroxy-ethyl)-4-methyl-thiazol-3-ium chloride hydrochloride), an analog of the transketolase cofactor thiamine, is a potent transketolase inhibitor but suffers from poor pharmacokinetics due to high clearance and C(max) linked toxicity. An efficient way of improving the pharmacokinetic profile of 5a is to prepare oxidized prodrugs which are slowly reduced in vivo yielding longer, sustained blood levels of the drug. The synthesis of such prodrugs and their evaluation in rodent models is reported.
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