Sequential Enzymatic Epoxidation Involved in Polyether Lasalocid Biosynthesis
摘要:
Enantioselective epoxidation followed by regioselective epoxide opening reaction are the key processes in construction of the polyether skeleton. Recent genetic analysis of ionophore polyether biosynthetic gene dusters suggested that flavin-containing monooxygenases (FMOs) could be involved in the oxidation steps. In vivo and in vitro analyses of Lsd18, an FMO involved in the biosynthesis of polyether lasalocid, using simple olefin or truncated diene of a putative substrate as substrate mimics demonstrated that enantioselective epoxidation affords natural type mono- or bis-epoxide in a stepwise manner. These findings allow us to figure out enzymatic polyether construction in lasalocid biosynthesis.
Oxidative Catalysis Using the Stoichiometric Oxidant as a Reagent: An Efficient Strategy for Single-Electron-Transfer-Induced Tandem Anion-Radical Reactions
Oxidative single‐electrontransfer‐catalyzed tandem reactions consisting of a conjugate addition and a radical cyclization are reported, which incorporate the mandatory terminal oxidant as a functionality into the product.
Iron-Mediated Photochemical Anti-Markovnikov Hydroazidation of Unactivated Olefins
作者:Henry Lindner、Willi M. Amberg、Erick M. Carreira
DOI:10.1021/jacs.3c09122
日期:2023.10.18
Unactivated olefins are converted to alkyl azides with bench-stable NaN3 in the presence of FeCl3·6H2O under blue-light irradiation. The products are obtained with anti-Markovnikov selectivity, and the reaction can be performed under mild ambient conditions in the presence of air and moisture. The transformation displays broad functional group tolerance, which renders it suitable for functionalization
在蓝光照射下,在 FeCl 3 ·6H 2 O 存在下,未活化的烯烃与实验室稳定的 NaN 3转化为烷基叠氮化物。所得产物具有抗马可夫尼科夫选择性,反应可以在空气和湿气存在的温和环境条件下进行。该转化表现出广泛的官能团耐受性,这使其适合复杂分子的官能化。进行机理研究以深入了解叠氮反应并揭示水合铁中的水作为氢原子源的作用。