Structure–Activity Relationships of Synthetic Cordycepin Analogues as Experimental Therapeutics for African Trypanosomiasis

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• 作者：Suman K. Vodnala ; Thomas Lundb?ck ; Esther Yeheskieli ; Birger Sj?berg ; Anna-Lena Gustavsson ; Richard Svensson ; Gabriela C. Olivera ; Anthonius A. Eze ; Harry P. de Koning ; Lars G. J. Hammarstr?m ; Martin E. Rottenberg
• 刊名：Journal of Medicinal Chemistry
• 出版年：2013
• 出版时间：December 27, 2013
• 年：2013
• 卷：56
• 期：24
• 页码：9861-9873
• 全文大小：545K
• ISSN：1520-4804

文摘

Novel methods for treatment of African trypanosomiasis, caused by infection with Trypanosoma brucei are needed. Cordycepin (3鈥?deoxyadenosine, 1a) is a powerful trypanocidal compound in vitro but is ineffective in vivo because of rapid metabolic degradation by adenosine deaminase (ADA). We elucidated the structural moieties of cordycepin required for trypanocidal activity and designed analogues that retained trypanotoxicity while gaining resistance to ADA-mediated metabolism. 2-Fluorocordycepin (2-fluoro-3鈥?deoxyadenosine, 1b) was identified as a selective, potent, and ADA-resistant trypanocidal compound that cured T. brucei infection in mice. Compound 1b is transported through the high affinity TbAT1/P2 adenosine transporter and is a substrate of T. b. brucei adenosine kinase. 1b has good preclinical properties suitable for an oral drug, albeit a relatively short plasma half-life. We present a rapid and efficient synthesis of 2-halogenated cordycepins, also useful synthons for the development of additional novel C2-substituted 3鈥?deoxyadenosine analogues to be evaluated in development of experimental therapeutics.