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 itsN-methylderivatives 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