[EN] MYOGLOBIN-BASED CATALYSTS FOR CARBENE TRANSFER REACTIONS<br/>[FR] CATALYSEURS À BASE DE MYOGLOBINE POUR RÉACTIONS DE TRANSFERT DE CARBÈNE
申请人:UNIV ROCHESTER
公开号:WO2016086015A1
公开(公告)日:2016-06-02
Methods are provided for carrying out carbene transfer transformations such as olefin cyclopropanation reactions, carbene heteroatom-H insertion reactions (heteroatom = N, S, Si), sigmatropic rearrangement reactions, and aldehyde olefination reactions with high efficiency and selectivity by using a novel class of myoglobin-based biocatalysts. These methods are useful for the synthesis of a variety of organic compounds which contain one or more new carbon-carbon or carbon-heteroatom (N, S, or Si) bond. The methods can be applied for conducting these transformations in vitro (i.e., using the biocatalyst in isolated form) and in vivo (i.e., using the biocatalyst in a whole cell system).
Soluble Polymer-Supported Ruthenium Porphyrin Catalysts for Epoxidation, Cyclopropanation, and Aziridination of Alkenes
作者:Jun-Long Zhang、Chi-Ming Che
DOI:10.1021/ol0259138
日期:2002.5.1
[reaction: see text] Attachment of poly(ethyleneglycol) (PEG) to ruthenium porphyrin via a covalent etheric bond gives soluble polymer-supported ruthenium catalysts 3-5. These catalysts exhibit high reactivity and selectivity toward alkene epoxidation with 2,6-dichloropyridine N-oxide and alkene cyclopropanation with diazo compounds. The application of these catalysts in the synthesis of unstable
Asymmetric Cyclopropanation of Styrenes Catalyzed by Metal Complexes of <i>D</i><sub>2</sub>-Symmetrical Chiral Porphyrin: Superiority of Cobalt over Iron
作者:Ying Chen、X. Peter Zhang
DOI:10.1021/jo070997p
日期:2007.7.1
The cobalt(II) complex of D2-symmetric chiral porphyrin [Co(1)] is an effective catalyst for highly diastereoselective and enantioselective cyclopropanation of a broad range of styrene derivatives under mild conditions. Dimerization of diazo compounds, a common side reaction in metal-mediated carbene transfer processes, is minimized in a cobalt porphyrin-based system, obviating the need to employ excess
D 2对称手性卟啉[Co(1)]的钴(II)配合物是在温和条件下对多种苯乙烯衍生物进行高度非对映选择性和对映选择性环丙烷化的有效催化剂。在基于钴卟啉的体系中,重氮化合物的二聚反应(在金属介导的卡宾转移过程中常见的副反应)被最小化,从而避免了使用过量底物和缓慢添加重氮化合物的需求。[Co(1)]的高催化活性和选择性显然是由于钴离子和手性卟啉1的适当组合,因为使用了具有相同配体[Fe(1)的铁(III)配合物)Cl]以低收率和差的对映选择性提供所需的环丙烷产物。
Generation and Reactivity of Electron-Rich Carbenes on the Surface of Catalytic Gold Nanoparticles
receiving additional electron density from a metal. Here, it is shown that Au nanoparticles (NPs) generate an electron-rich carbene on surface after transferringelectron density to the carbonyl group of an in situ activated diazoacetate, as assessed by Fourier transformed infrared (FT-IR) spectroscopy, magic angle spinning nuclear magnetic resonance (MAS NMR), and Raman spectroscopy. Density functional
通过从金属接收额外的电子密度,可以调节并最终逆转卡宾的反应性。在这里,通过傅立叶变换红外 (FT-IR) 光谱法、魔角旋转法评估,金纳米粒子 (NPs) 在将电子密度转移到原位活化的重氮乙酸酯的羰基后,在表面产生富电子卡宾核磁共振(MAS NMR)和拉曼光谱。密度泛函理论 (DFT) 计算支持观察到的实验值,并揭示了至少三个不同的 Au 原子在卡宾稳定过程中的参与。表面稳定的卡宾对亲核试剂显示出非凡的稳定性,并与亲电试剂反应生成新产品。
Monomeric Rhodium(II) Catalysts for the Preparation of Aziridines and Enantioselective Formation of Cyclopropanes from Ethyl Diazoacetate at Room Temperature
作者:J. R. Krumper、M. Gerisch、J. M. Suh、R. G. Bergman、T. D. Tilley
DOI:10.1021/jo035120e
日期:2003.12.1
coordinatively unsaturated monomeric rhodium(II) (2a,b, 3a,b) are described. These complexes serve as catalysts for cyclopropanation of olefins by ethyl diazoacetate, giving excellent yields (66-94%). Enantioselectivities for the cis product isomers are good (61-84%). The reaction shows an unusual preference for formation of the cis isomers. Catalytic aziridination of N-aryl imines with ethyl diazoacetate is