reported here the low loading porphyrin-inspired high-valent manganese (IV)-oxo complex was applied in oxidative kineticresolution (OKR) of racemic heterocyclic sulfoxides using the environmentally benign hydrogen peroxide for the first time. This approach allows for rapid OKR (0.5 h) of a variety of racemic sulfoxides (including pyridine, pyrimidine, pyrazine, thiazole, benzothiazole, thiophene) in
Chiral Ligands in Hypervalent Iodine Compounds: Synthesis and Structures of Binaphthyl‐Based λ
<sup>3</sup>
‐Iodanes
作者:Huaiyuan Zhang、Rodrigo A. Cormanich、Thomas Wirth
DOI:10.1002/chem.202103623
日期:2022.1.24
Contained chirality: Novel binaphthyl-based chiralhypervalentiodine(III) reagents are presented with the chirality contained only in the ligand. These have been characterized by X-ray analysis, and all derivatives show the prominent reactivities of hypervalentiodine reagents. Due to their limited stability in solution, they are inefficient chiraliodine(III) derivatives.
包含手性:新型基于联萘的手性高价碘(III)试剂具有仅包含在配体中的手性。这些已通过 X 射线分析进行了表征,并且所有衍生物都显示出高价碘试剂的突出反应性。由于它们在溶液中的稳定性有限,它们是低效的手性碘 (III) 衍生物。
Enzymatic Synthesis of Novel Chiral Sulfoxides Employing Baeyer-Villiger Monooxygenases
作者:Ana Rioz-Martínez、Gonzalo de Gonzalo、Daniel E. Torres Pazmiño、Marco W. Fraaije、Vicente Gotor
DOI:10.1002/ejoc.201000890
日期:2010.11
Optically active sulfoxides are compounds of high interest in organic chemistry. Herein, we report the preparation of a set of chiral heteroaryl alkyl, cyclohexyl alkyl, and alkyl alkyl sulfoxides by using enantioselective sulfoxidation reactions employing three Baeyer-Villigermonooxygenases (BVMOs). Careful selection of the reaction conditions, starting sulfide, and biocatalyst can be used to achieve
Exploring the biocatalytic scope of a bacterial flavin-containing monooxygenase
作者:Ana Rioz-Martínez、Malgorzata Kopacz、Gonzalo de Gonzalo、Daniel E. Torres Pazmiño、Vicente Gotor、Marco W. Fraaije
DOI:10.1039/c0ob00988a
日期:——
A bacterial flavin-containing monooxygenase (FMO), fused to phosphite dehydrogenase, has been used to explore its biocatalytic potential. The bifunctional biocatalyst could be expressed in high amounts in Escherichia coli and was able to oxidize indole and indole derivatives into a variety of indigo compounds. The monooxygenase also performs the sulfoxidation of a wide range of prochiral sulfides, showing moderate to good enantioselectivities in forming chiral sulfoxides.
manganese-catalyzed sulfoxidation. On the basis of the theoretical study, the coupled high-valent manganese(IV)–oxo cationradical species, which bears obvious similarities with that of reactive intermediates in the catalytic oxygenation reactions based on the cytochrome P450 and metalloporphyrin models, has been proposed as the reactive oxidant in the non-heme manganese catalyst system.
锰复合物与卟啉样配体,其催化的杂芳硫化物,包括咪唑,苯并咪唑,吲哚,吡啶,嘧啶,吡嗪,的高度化学选择性和对映选择性氧化符号嗪,噻吩,噻唑,苯并噻唑,苯并恶唑和,与过氧化氢如描述的那样,在短的反应时间(0.5h)内以良好至优异的产率和对映选择性(高达90%产率和高达> 99%ee)提供相应的亚砜。该方法的实际实用性已在克规模的手性亚砜的合成中得到证明。用18 O标记水(H 2 18 O),过氧化氢(H 2 18 O 2)和氢过氧化枯基表明,通过羧酸协助的O-O键杂化作用,生成了高价的锰-氧代氧离子作为氧原子传递剂。还进行了密度泛函理论(DFT)计算,以进一步了解锰催化的硫氧化机理。在理论研究的基础上,提出了基于细胞色素P450和金属卟啉模型的高价锰(IV)-氧代阳离子自由基与催化氧化反应中的反应中间体具有明显相似性的化合物。非血红素锰催化剂体系中的活性氧化剂。