Atom-Economical and Tandem Conversion of Nitriles to <i>N</i>-Methylated Amides Using Methanol and Water
作者:Bhaskar Paul、Milan Maji、Sabuj Kundu
DOI:10.1021/acscatal.9b03916
日期:2019.11.1
A cobalt complex catalyzed tandem conversion of nitrile to N-methylated amide is described using a methanol and water mixture. Using this protocol, several nitriles were directly and efficiently converted to the desired N-methylated amides. Kinetic experiments using H2O18 and CD3OD suggested that water and methanol were the source of the oxygen atom and methyl group, respectively, in the final N-methylated
描述了使用甲醇和水的混合物的钴络合物催化的腈串联转化为N-甲基化酰胺。使用该方案,将几个腈直接有效地转化为所需的N-甲基化酰胺。使用H 2 O 18和CD 3 OD进行的动力学实验表明,水和甲醇分别是最终N中氧原子和甲基的来源。-甲基化酰胺。重要的是,控制实验实现了活性Co(I)–H物种参与该转化的过程。动力学同位素效应(KIE)研究表明,甲醇C–H键的活化是动力学上重要的一步。哈米特图证实了电子不足的腈的反应更快。此外,计算研究支持了从腈形成N-甲基化酰胺的可能途径。
Regioselective Three-Component Reaction of Pyridine <i>N</i>-Oxides, Acyl Chlorides, and Cyclic Ethers
作者:D. Heulyn Jones、Steven T. Kay、Jayde A. McLellan、Alan R. Kennedy、Nicholas C. O. Tomkinson
DOI:10.1021/acs.orglett.7b01481
日期:2017.7.7
A novel three-component reaction of pyridineN-oxides, acyl chlorides, and cyclic ethers is described. Treatment of an electron-deficient pyridineN-oxide with an acyl chloride in the presence of a cyclic ether at 25–50 °C leads to a substituted pyridine as a single regioisomer in up to 58% isolated yield. Isotopic-labeling experiments and substrate scope support the reaction proceeding through a carbene