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- W2000372394 abstract "Fluorescence emission properties of 8-azacaffeine, 8-azatheophylline and other N-alkylated 8-azaxanthines (8-azaXan) have been examined. It is shown that N-methylated 8-azaxanthines, as well as 8-azatheophylline, are highly fluorescent in aqueous medium as the neutral, and, in some instances, also as the monoanionic, forms. 8-Azacaffeine exhibits moderate emission, but its isomer, 1,3,8-trimethyl-8-azaXan, is highly fluorescent. All three 8-azaxanthines monomethylated on the triazole ring, as well as 8-azaxanthosine, exhibit increased acidity in the excited state. Some fluorescent pyrazolo[4,3-d]pyrimidine-5,7-diones, xanthine congeners of pyrazolo[4,3-d]pyrimidines, are also reported. Many of these are good fluorescent probes in enzymatic, receptor binding, and nucleic acid systems, some examples of which are presented. In particular, 8-azaXan is an excellent fluorescent probe for purine nucleoside phosphorylases, as a fluorogenic substrate in the reverse, synthetic pathway." @default.
- W2000372394 created "2016-06-24" @default.
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- W2000372394 date "2007-04-01" @default.
- W2000372394 modified "2023-10-10" @default.
- W2000372394 title "Fluorescent nucleoside analogs: synthesis, properties, and applications" @default.
- W2000372394 doi "https://doi.org/10.1016/j.tet.2007.01.070" @default.
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