Enzymatic Nitrogen Insertion into Unactivated C–H Bonds
作者:Soumitra V. Athavale、Shilong Gao、Anuvab Das、Sharath Chandra Mallojjala、Edwin Alfonzo、Yueming Long、Jennifer S. Hirschi、Frances H. Arnold
DOI:10.1021/jacs.2c08285
日期:2022.10.19
aliphatic C–H bonds, ubiquitous in molecular structures, could allow ready access to diverse chemical products. While enzymatic oxygenation of C–H bonds is well established, the analogous enzymatic nitrogen functionalization is still unknown; nature is reliant on preoxidized compounds for nitrogen incorporation. Likewise, synthetic methods for selective nitrogen derivatization of unbiased C–H bonds remain
In this work, the use of N-acyloxybenzamides as efficient acyl nitrene precursors under photoredox/iron dual catalysis is reported. The resulting acyl nitrenes could be captured by various types of C–H bonds and S- or P-containing molecules. Mechanism investigations suggested that the formation of the acyl nitrene from the N-acyloxybenzamide occurs by a photoredox process, and it is believed that in
在这项工作中,报道了在光氧化还原/铁双重催化下使用N-酰氧基苯甲酰胺作为有效的酰基氮烯前体。由此产生的酰基氮烯可以被各种类型的 C-H 键和含 S 或 P 的分子捕获。机理研究表明,由N-酰氧基苯甲酰胺形成酰基氮烯是通过光氧化还原过程发生的,并且认为在该氧化还原过程中,N-酰氧基苯甲酰胺的氧化 N-H 键断裂发生在还原性 N-O 键断裂之前N-酰氧基苯甲酰胺。
Expanding Biocatalysis for Organosilane Functionalization: Enantioselective Nitrene Transfer to Benzylic Si–C–H Bonds
作者:Anuvab Das、Yueming Long、Ryan R. Maar、John M. Roberts、Frances H. Arnold
DOI:10.1021/acscatal.3c05370
日期:2024.1.5
Directed evolution has the potential to enable abiological chemistry by engineering natural enzymes to function on non-natural substrates. In this study, we expanded the repertoire of enzymatic functionalization of organosilicon compounds by evolving a cytochrome P450 variant for the selective amidation of organosilanes, resulting in the production of functionalized α-aminosilanes with remarkable
Mechanochemical Synthesis of N‐Aryl Amides from O‐Protected Hydroxamic Acids
作者:Emmanouil Broumidis、Mary C. Jones、Filipe Vilela、Gareth O. Lloyd
DOI:10.1002/cplu.202000451
日期:2020.8
protocols for the synthesis of an array of N‐arylamides have been developed. This was achieved by a C−N cross‐coupling between O‐pivaloyl hydroxamicacids and aryl iodides or aryl boronic acids, in the presence of a stoichiometric amount of a copper mediator. The effectiveness of this method is highlighted by the high‐yielding (up to 94 %), scalable (up to 8 mmol), and rapid (20 minutes) synthesis of N‐aryl