Synthesis and Applications of [1-<sup>15</sup>N]-Labeled 4,6-Dimethyl-4<i>H</i>-[1,2,5]oxadiazolo[3,4-<i>d</i>]pyrimidine-5,7-dione 1-Oxide as a Useful Tool for Mechanistic Investigations
作者:Magoichi Sako、Isamu Yaekura、Souichi Oda、Kosaku Hirota
DOI:10.1021/jo000835s
日期:2000.10.1
[1-(15)N]-Labeled 4,6-dimethyl-4H-[1,2,5]oxadiazolo[3,4-d]pyrimidine-5,7-dione 1-oxide (1-(15)N1) was easily prepared by nitration of commercially available 6-amino-1,3-dimethyl-1H-pyrimidine-2,4-dione using 15N-enriched nitric acid followed by an intramolecular oxidative cyclization with iodosylbenzene diacetate under mild conditions. On the basis of the experimental results using 1-(15)N1, the formation
[1-(15)N]-标签的4,6-二甲基-4H- [1,2,5]恶二唑并[3,4-d]嘧啶-5,7-二酮1-氧化物(1-(15)N1通过使用富含15N的硝酸硝化市售的6-氨基-1,3-二甲基-1H-嘧啶-2,4-二酮,然后在温和条件下用碘代乙苯二乙酸酯进行分子内氧化环化,可以轻松地制备2)。根据使用1-(15)N1的实验结果,形成了8-苯基茶碱(3),1,3-二甲基脲嗪(4:n = 0,1)和1,3,7,9- N-氧化物1与苄胺,苯胺或哌啶的热反应中生成四甲基-1H,9H-嘧啶基[5,4-g]蝶啶-2,4,6,8-四酮++ +(5)并生成通过考虑所用亲核试剂对1的3a位的初始攻击,可以合理地解释与N-乙酰半胱胺反应中NO或NO相关物种的数量。