Formation of Amides from Imines via Cyanide-Mediated Metal-Free Aerobic Oxidation
摘要:
A new protocol for the direct formation of amides from imines derived from aromatic aldehydes via metal-free aerobic oxidation in the presence of cyanide is described. This protocol was applicable to various aldimines, and the desired amides were obtained in moderate to good yields. Mechanistic studies suggested that this aerobic oxidative amidation might proceed via the addition of cyanide to imines followed by proton transfer from carbon to nitrogen in the original imines, leading to carbanions of alpha-amino nitriles, which undergo subsequent oxidation with molecular oxygen in air to provide the desired amide compounds.
Phosphine ligand-free RuCl3-catalyzed reductive N-alkylation of aryl nitro compounds
作者:Da-Wei Tan、Hong-Xi Li、David James Young、Jian-Ping Lang
DOI:10.1016/j.tet.2016.05.036
日期:2016.7
efficiently catalyses the reductive N-alkylation of aryl nitrocompounds with alcohols using bio-based glycerol as the hydrogen source and without the need for any added solvents. The reaction can be easily manipulated to produce either imines or secondary amines in high yields. RuCl3-catalyzed reductive N-alkylation of nitroarenes with alcohols affords the corresponding imine products in good to excellent
Selective Aerobic Oxidation of Alcohols to Aldehydes, Carboxylic Acids, and Imines Catalyzed by a Ag-NHC Complex
作者:Lei Han、Ping Xing、Biao Jiang
DOI:10.1021/ol501353q
日期:2014.7.3
Silver NHC catalysts have been developed for the selective oxidation of alcohols to aldehydes or carboxylic acids in the presence of BnMe3NOH or KOH under dry air. The aerobic oxidation conditions are mild, and the yield is excellent. Further tandem catalysis enables the one-pot synthesis of imines in excellent yield. Only 0.1 mol % of the catalyst is required.
Phosphine-Free Well-Defined Mn(I) Complex-Catalyzed Synthesis of Amine, Imine, and 2,3-Dihydro-1<i>H</i>-perimidine via Hydrogen Autotransfer or Acceptorless Dehydrogenative Coupling of Amine and Alcohol
report the synthesis of amines/imines directly from alcohol and amines via hydrogen autotransfer or acceptorless dehydrogenation catalyzed by well-defined phosphine-free Mn complexes. Both imines and amines can be obtained from the same set of alcohols and amines using the same catalyst, only by tuning the reaction conditions. The amount and nature of the base are found to be a highly important aspect for
An Efficient Lewis Acid Catalyzed Povarov Reaction for the One-Pot Stereocontrolled Synthesis of Polyfunctionalized Tetrahydroquinolines
作者:Cristina Cimarelli、Samuele Bordi、Pamela Piermattei、Maura Pellei、Fabio Del Bello、Enrico Marcantoni
DOI:10.1055/s-0036-1589104
日期:2017.12
is expanded to the one-pot synthesis of N-alkyltetrahydroquinolines through a very efficient iminium-Povarov approach. A deeper insight on the reaction system was provided by the study on the side reactions occurring in the reaction conditions and on the nature of the stereoselectivity. An easy and efficient synthetic methodology for the one-pot stereocontrolledsynthesis of tetrahydroquinolines through