Ester Prodrugs of Cyclic 1-(<i>S</i>)- [3-Hydroxy-2-(phosphonomethoxy)propyl]-5-azacytosine: Synthesis and Antiviral Activity
作者:Marcela Krečmerová、Antonín Holý、Radek Pohl、Milena Masojídková、Graciela Andrei、Lieve Naesens、Johan Neyts、Jan Balzarini、Erik De Clercq、Robert Snoeck
DOI:10.1021/jm0707166
日期:2007.11.1
Reaction of 1-(S)-[3-hydroxy-2-(phosphonomethoxy)propyl]-5-azacytosine (1) with dicyclohexylcarbodiimide and N,N,-dicyclohexyl-4-morpholinocarboxamidine in dimethylformamide at elevated temperature afforded the corresponding cyclic phosphonate 2, that is, 1-[(5S)-2-hydroxy-2-oxido-1,4,2-dioxaphosphinan.-5-yl]methyl}-5-azacytosine. Compound 2 exerts strong in vitro activity against DNA viruses, comparable with activity of parent compound 1. Transformation of 2 to its tetrabutylammonium salt followed by reaction with alkyl or acyloxyalkyl halogenides enabled us to prepare a series of structurally diverse ester prodrugs: alkyl (octadecyl), alkenyl (erucyl), alkoxyalkyl (hexadecyloxyethyl), and acyloxyalkyl. (pivaloyloxyrrtethyl) (3-6). The introduction of an alkyl, alkoxyalkyl, or acyloxyalkyl ester group to the molecule resulted in an increase of antiviral activity; the most active compound was found to be the hexadecyloxyethyl ester a. The relative configuration of the diastereoisomer trans-6 was determined using H,H-NOESY NMR.