Purines.<b>XIV</b>. Synthesis and properties of 8-nitroxanthine and its<i>N</i>-methyl derivatives
作者:Mosselhi A. Mosselhi、Wolfgang Pfleiderer
DOI:10.1002/jhet.5570300509
日期:1993.10
Xanthine (1) and its N-methyl derivatives 2–16 have been nitrated to the corresponding 8-nitro derivatives 17–32 under different reaction conditions. Nitration in glacial acetic acid with nitric acid works well with the N-7 unsubstituted and some of the 9-methylxanthines, respectively, whereas the 7-methylxanthine derivatives react best with nitronium tetrafluoroborate in sulfolane or glacial acetic
黄嘌呤(1)及其N-甲基衍生物2–16在不同的反应条件下已被硝化为相应的8-硝基衍生物17–32。在冰醋酸中用硝酸硝化分别与未取代的N-7和一些9-甲基黄嘌呤效果很好,而7-甲基黄嘌呤衍生物与四氟硼酸酯在环丁砜或冰醋酸中反应最好。8硝基可以被亲核取代形成8-氯,33,34,8-乙氧基- ,35,36,和尿酸衍生物37-40,分别。新合成的8-硝基黄嘌呤已通过元素分析p K表征。-测定以及uv和1 H-nmr光谱。