Phosphovanadomolybdic acid catalyzed desulfurization–oxygenation of secondary and tertiary thioamides into amides using molecular oxygen as the terminal oxidant
Something functional: The title reaction proceeds in the presence of azide and water to deliver amides in high yields, and it can be used in a ring‐expansion strategy to generate lactams. A mechanism is proposed based on experimental results. This reaction offers a new approach to functionalizing simple and readily available hydrocarbons. DDQ=2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone.
An umpolung approach to amides via hypervalentiodine-mediatedoxidative rearrangement of N–H ketimines under mild reaction conditions is described. This strategy provides target amides with excellent selectivity in good yields. In addition, preliminary mechanistic studies demonstrated that the migration preference depends on both steric and electronic effects of the migrating groups.
Methods for the synthesis of amides via the direct oxidation of imines are rarely reported. Here we report an efficient method for Pd-catalyzed oxidation of imines to amide derivatives by the use of cheap aqueous tert-butyl hydroperoxide as an oxidant through a Wacker-type reaction. This method is practically convenient and displays high functional group tolerance, allowing a variety of imines to transform
FeCl<sub>3</sub>-catalyzed oxidative amidation of benzylic C–H bonds enabled by a photogenerated chlorine-radical
作者:Yingying Yang、Xianglin Yu、Na He、Xinxiang Huang、Xizhong Song、Jingbo Chen、Jun Lin、Yi Jin
DOI:10.1039/d3cc03186a
日期:——
broad substrate scope (60 examples) and offer operationally simple, scalable procedures for accessing valuable products from methylarenes in a single step. Mechanisticstudies and control experiments confirm the participation of a photogenerated chlorine radical in facilitating the hydrogen atom transfer (HAT) from the benzylic C–H bond to initiate the reaction.
Nickel‐Catalyzed Isotopic Labeling: Synthesis of Oxygen‐18‐Labeled Esters from Amides
作者:Nithin Pootheri、Sunwoo Lee
DOI:10.1002/adsc.202300729
日期:2023.11.21
three-component reaction of amides, alkyl halides, and 18O-labeled water. This method demonstrated excellent selectivity and compatibility with various amides and alkyl halides, allowing the synthesis of diverse isotopicallylabelled esters. Ni-catalyzed reaction of alkyl bromides, carboxylates that generated from amides, and water in the presence of a base formed the desired esters.
开发了一种通过酰胺、烷基卤和 18 O-标记水的 Ni 催化三组分反应制备18 O-标记酯的方法。该方法表现出优异的选择性以及与各种酰胺和烷基卤的相容性,从而可以合成多种同位素标记的酯。在碱存在下,烷基溴、由酰胺生成的羧酸盐和水发生镍催化反应,形成所需的酯。