The first oxidative C(sp3)–H phosphonylation of tertiary aliphatic amines has been developed. The use of cobalt acetate as a catalyst, N-hydroxyphthalimide as a cocatalyst, and air as an oxidant enabled the conversion of tertiary aromatic and aliphatic amines into α-aminophosphonates in moderate to excellent yields under mild conditions via a cross dehydrogenative couplingreaction.
The various α-aminophosphonates have been prepared from tertiary aromatic and aliphatic amines with P(O)H compounds via a tert-butyl hydroperoxide mediated cross-dehydrogenativecouplingreaction, eliminating the need for transition-metal catalysts. The oxidation of tertiary amine by tert-butyl hydroperoxide generates an iminium cation intermediate. A further addition of P(O)H compound to iminium cation
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-Arylamines Coupled with Aldehydes, Ketones, and Imines by Means of Photocatalytic Proton-Coupled Electron Transfer
作者:Qing Xia、Hao Tian、Jianyang Dong、Yi Qu、Lili Li、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1002/chem.201801886
日期:2018.7.2
A photoredox‐catalyzed umpolung strategy for coupling reactions between aldehydes, ketones, imines, and N‐arylamines is reported. These reactions proceed by a Brønstedacid‐activated proton‐coupled electron transfer pathway, and the protocol was used to synthesize a broad scope of 1,2‐amino alcohols and vicinal diamines, both of which are common motifs in biologically active natural products, pharmaceutically
α-Cyanation of Aromatic Tertiary Amines using Ferricyanide as a Non-Toxic Cyanide Source
作者:Alexander M. Nauth、Nicola Otto、Till Opatz
DOI:10.1002/adsc.201500698
日期:2015.11.16
reaction of aromatictertiaryamines with potassium ferricyanide directly provides the useful α-amino nitriles. The inexpensive iron complex functions both as an oxidant and as a cyanidesource. The presence of molecular oxygen speeds up the reaction which can be performed in aqueous tert-butanol or even in ethanol-based mixtures like Tequila. While amine cyanations usually employ highly toxic cyanide sources
Amination of Aryl Halides Mediated by Electrogenerated Nickel from Sacrificial Anode
作者:Farah Daili、Stéphane Sengmany、Eric Léonel
DOI:10.1002/ejoc.202100194
日期:2021.5.7
C(sp2)−N bond formation only mediated by nickel salts electrogenerated from the sacrificial anode has been investigated for the first time to prepare functionalized arylamine derivatives. The cross‐couplings are performed under constant current electrolysis, in an undivided cell, and without additional ligand at room temperature.