Olefin<i>cis</i>-Dihydroxylation and Aliphatic CH Bond Oxygenation by a Dioxygen-Derived Electrophilic Iron-Oxygen Oxidant
作者:Sayanti Chatterjee、Tapan Kanti Paine
DOI:10.1002/anie.201502229
日期:2015.8.3
metal–oxygen oxidants to carry out O2‐dependent transformation reactions. However, the selective oxidation of CH and CC bonds by biomimetic complexes using O2 remains a major challenge in bioinspired catalysis. The reactivity of iron–oxygen oxidants generated from an FeII–benzilate complex of a facial N3 ligand were thus investigated. The complex reacted with O2 to form a nucleophilic oxidant, whereas
许多含铁酶涉及金属-氧氧化剂,以进行依赖于O 2的转化反应。然而,C的选择性氧化通过仿生络合物H和CC键使用了O 2保持在仿生催化的一个重大挑战。因此研究了由面部N 3配体的Fe II-苯甲酸酯络合物生成的铁-氧氧化剂的反应性。该络合物与O 2反应形成亲核氧化剂,而在路易斯酸的存在下产生被外部底物截获的亲电子氧化剂。基于机理研究,亲核的Fe II有人提议由苯甲酸酯络合物形成–hydroperoxo物种,该复合物在路易斯酸存在下经历杂化OO键裂解,生成Fe IV –oxo–hydroxo氧化剂。亲电子氧化铁可选择性地将硫化物氧化为亚砜,将烯烃氧化为顺式二醇,并羟基化烷烃的CH键,包括环己烷的CH键。
Highly Enantioselective Iron-Catalyzed <i>cis</i>
-Dihydroxylation of Alkenes with Hydrogen Peroxide Oxidant via an Fe<sup>III</sup>
-OOH Reactive Intermediate
作者:Chao Zang、Yungen Liu、Zhen-Jiang Xu、Chun-Wai Tse、Xiangguo Guan、Jinhu Wei、Jie-Sheng Huang、Chi-Ming Che
DOI:10.1002/anie.201603410
日期:2016.8.22
catalysts for highly enantioselective asymmetric cis‐dihydroxylation (AD) of alkenes with broad substrate scope remains a challenge. By employing [FeII(L)(OTf)2] (L=N,N′‐dimethyl‐N,N′‐bis(2‐methyl‐8‐quinolyl)‐cyclohexane‐1,2‐diamine) as a catalyst, cis‐diols in up to 99.8 % ee with 85 % isolated yield have been achieved in AD of alkenes with H2O2 as an oxidant and alkenes in a limiting amount. This “[FeII(L)(OTf)2]+H2O2”
开发具有良好底物范围的烯烃的高对映选择性不对称顺二羟基化(AD)的环境友好型催化剂仍然是一个挑战。通过使用[Fe II(L)(OTf)2 ](L = N,N'-二甲基-N,N'-双(2-甲基-8-喹啉基)-环己烷-1,2-二胺)作为催化剂,在以H 2 O 2为氧化剂的烯烃和数量有限的烯烃的AD中,已实现了高达99.8%ee的顺式二醇和85%的分离产率。该“ [Fe II(L)(OTf)2 ] + H 2 O 2”方法适用于(E)-烯烃和末端烯烃(24个实例,ee大于80%,最大1 g)。机理研究包括18种O-标记,UV / Vis,EPR,ESI-MS分析和DFT计算,为手性Fe III- OOH活性物种参与两个C-O键的对映选择性形成提供了证据。
Mechanistically Driven Development of an Iron Catalyst for Selective <i>Syn</i>-Dihydroxylation of Alkenes with Aqueous Hydrogen Peroxide
作者:Margarida Borrell、Miquel Costas
DOI:10.1021/jacs.7b07909
日期:2017.9.13
to be resolved in the design of iron catalysts for olefin syn-dihydroxylation with potential utility in organic synthesis. Toward this end, in this work a novel catalyst bearing a sterically encumbered tetradentate ligand based in the tpa (tpa = tris(2-methylpyridyl)amine) scaffold, [FeII(CF3SO3)2(5-tips3tpa)], 1 has been designed. The steric demand of the ligand was envisioned as a key element to support
The acid accelerated ruthenium-catalysed dihydroxylation. Scope and limitations
作者:Bernd Plietker、Meike Niggemann、Anja Pollrich
DOI:10.1039/b316546a
日期:——
Recently, we discovered a significant rate acceleration in RuO4-catalysed dihydroxylations of olefins by addition of Brönsted-acids resulting in a reduction of the catalyst loading to only 0.5 mol%. The present paper gives a full account on the optimisation protocol that led to the discovery of the beneficial influence of protic acids. A strong focus is set on the detailed description of the influence of different reaction parameters on both reactivity and selectivity. In the second part an intense investigation of scope and limitations will be presented. The results provided in this manuscript might lead to a deeper understanding of competing processes that influence the selectivity in RuO4-catalysed dihydroxylations.
SYNTHESIS AND APPLICATION OF CHIRAL SUBSTITUTED POLYVINYLPYRROLIDINONES
申请人:Kansas State University Research Foundation
公开号:US20200306737A1
公开(公告)日:2020-10-01
Chiral polyvinylpyrrolidinone (CSPVP), complexes of CSPVP with a core species, such as a metallic nanocluster catalyst, and enantioselective oxidation reactions utilizing such complexes are disclosed. The CSPVP complexes can be used in asymmetric oxidation of diols, enantioselective oxidation of alkenes, and carbon-carbon bond forming reactions, for example. The CSPVP can also be complexed with biomolecules such as proteins, DNA, and RNA, and used as nanocarriers for siRNA or dsRNA delivery.