Alternative synthesis and novel oxidizing ability of 6,9-disubstituted cyclohepta[b]pyrimido[5,4-d]pyrrole-8(6H),10(9H)-dione derivatives
作者:Shin-ichi Naya、Yusuke Iida、Makoto Nitta
DOI:10.1016/j.tet.2003.11.004
日期:2004.1
Synthesis of 6,9-disubstituted cyclohepta[b]pyrimido[5,4-d]pyrrole-8(6H),10(9H)-diones 7a–g was accomplished by ring opening and ring closure sequences of 9-substituted cyclohepta[b]pyrimido[5,4-d]furan-8,10(9H)-dione derivatives induced by several amines. Furthermore, alternative synthetic methodology for compounds 7a–e was also accomplished by single-step reaction of 2-chlorotropone with 6-aminouracil
6,9-二取代的环庚[ b ]嘧啶基[5,4 - d ]吡咯-8(6 H),10(9 H)-二酮7a – g的合成是通过9-取代的开环和闭环顺序完成的几种胺诱导的环庚[ b ]嘧啶基[5,4 - d ]呋喃-8,10(9 H)-二酮衍生物。此外,化合物7a - e的替代合成方法也可以通过在适度的条件下使2-氯托酮与6-氨基尿嘧啶衍生物进行一步反应来完成。7a的X射线晶体分析进行了澄清结构特征。通过紫外可见光谱和还原电势(相对于Ag / AgNO 3为−1.24至−1.39 V )研究了7a – e的性质。在好氧条件下,进行了7a - d对某些胺的新型光诱导氧化反应,得到的亚胺的收率超过100%[基于化合物7a - d ],表明该氧化反应发生在自动回收过程中。