Formation of Fungal 2,18-Dioxo-2,18-<i>seco</i> Indole Diterpenes by Nonenzymatic Flavin-Catalyzed Oxidative Ring Expansion and Oxygen Incorporation from Solvent Water
作者:Yu Dai、Xiu-Lan Xie、Hao-Fu Dai、Shu-Ming Li
DOI:10.1021/acs.orglett.3c01320
日期:2023.6.9
share a 6/5/5/6/6/6 hexacyclic ring system, while a 6/8/6/6/6 pentacyclic skeleton is occasionally observed. In this study, we demonstrate the formation of an eight-membered C–N heteroring via nonenzymatic flavin-catalyzed oxidative indole ring opening. More interestingly, 18O-labeled experiments proved that the two incorporated oxygen atoms are predominantly originated from water instead of molecular
大多数天然存在的吲哚二萜共享6/5/5/6/6/6六环系统,而偶尔观察到6/8/6/6/6五环骨架。在这项研究中,我们证明了通过非酶黄素催化氧化吲哚开环形成八元C-N杂环。更有趣的是, 18个O标记实验证明,掺入的两个氧原子主要来自水而不是分子氧。在此过程中,黄素的氧化形式催化胺到亚胺的两次连续氧化,并涉及环扩展的水解。然后还原的黄素通过用分子氧氧化形成H 2 O 2来再生。