Low-Temperature Photosensitized Oxidation of a Guanosine Derivative and Formation of an Imidazole Ring-Opened Product
作者:Chimin Sheu、Ping Kang、Saeed Khan、Christopher S. Foote
DOI:10.1021/ja011696e
日期:2002.4.1
photooxidation and was shown to be intermediate in the formation of two products of extensive degradation, C and D. Reaction of 1 with the singlet oxygen analogues 4-methyl-1,2,4-triazoline-3,5-dione (MTAD) and 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD) gave products consistent with a proposed mechanism involving the rearrangement of an initially formed endoperoxide to give A and B from reaction of 1 with singlet
制备了有机可溶性鸟苷衍生物 2',3',5'-O-(叔丁基二甲基甲硅烷基)鸟苷 (1),并在多种溶剂中在不同温度下对其进行了光敏氧化。单线态氧是负责该反应的活性氧化剂。即使在 -78 摄氏度,低温 NMR 也未检测到内过氧化物和二氧杂环丁烷中间体。具有氧化咪唑环的产物 (A) 是室温下唯一检测到的主要产物;该化合物可以通过低温柱色谱分离,并通过(1)H和(13)C和质谱进行表征。CO(2) 是另一个主要产品。少量相应的8-oxo-7,