Purines. Part XVI
作者:Mosselhi A. Mosselhi、Wolfgang Pfleiderer
DOI:10.1002/hlca.201000254
日期:2010.11
A series of N‐substituted 8‐aminoxanthines (=8‐amino‐3,7(or 3,9)‐dihydro‐1H‐purine‐2,6‐diones) 8–16 and 34–37 were synthesized from the corresponding 8‐nitroxanthines 1–7, 30–33, and 8‐(phenylazo)xanthines 17 and 18 by catalytic reduction. Another approach was derived from 6‐amino‐5‐(cyanoamino)uracils (=N‐(6‐amino‐1,2,3,4‐tetrahydro‐2,4‐dioxopyrimidin‐5‐yl)cyanamides) 23, 24, and 27 by base‐catalyzed
一系列Ñ取代8- aminoxanthines(= 8-氨基-3,7-(或3,9) -二氢- 1 ħ嘌呤-2,6-二酮)8 - 16和34 - 37,从相应的合成8 nitroxanthines 17 ,30 - 33,和8-(苯偶氮基)黄嘌呤17和18通过催化还原。另一种方法是从6-氨基-5-(氰基氨基)尿嘧啶(= N-(6-氨基-1,2,3,4-四氢-2,4-二氧代嘧啶5-5基)氰胺)23,24,和27通过碱催化环化产生25 – 28。所有8 aminoxanthines 8 - 29和34 - 37被乙酰化为相应的8-(乙酰氨基)黄嘌呤40 - 57,和长时间加热导致8-(二乙酰基)黄嘌呤58和59。几个8 aminoxanthines 8 - 13进行重氮化形成8 diazoxanthines 60 - 64。分离出的62和64与中间体形成的8-重氮黄嘌呤与1,3-二甲基巴比妥酸(=