Electrochemical Aziridination of Internal Alkenes with Primary Amines
作者:Maksim Ošeka、Gabriele Laudadio、Nicolaas P. van Leest、Marco Dyga、Aloisio de A. Bartolomeu、Lukas J. Gooßen、Bas de Bruin、Kleber T. de Oliveira、Timothy Noël
DOI:10.1016/j.chempr.2020.12.002
日期:2021.1
realizes this concept via an oxidative coupling between alkenes and primary alkylamines. The reaction is carried out in an electrochemical flow reactor leading to short reaction/residence times (5 min), high yields, and broad scope. At the cathode, hydrogen is generated, which can be used in a second reactor to reduce the aziridine, yielding the corresponding hydroaminated product. Mechanistic investigations
A sustainable strategy for the straightforward preparation of 2<i>H</i>-azirines and highly functionalized <i>NH</i>-aziridines from vinyl azides using a single solvent flow-batch approach
The reported flow-batch approach enables the easy preparation of 2H-azirines and their stereoselective transformation into highly functionalized NH-aziridines, starting from vinylazides and organolithium compounds. The protocol has been developed using cyclopentyl methyl ether (CPME) as an environmentally benign solvent, resulting into a sustainable, safe and potentially automatable method for the
α-tertiary primary amines via photocatalytic radicalcoupling of native C(sp3)–H substrates with N-unsubstituted ketimines is reported. LiBr was used as a hydrogen atom transfer reagent to cleave C(sp3)–H bonds to get alkyl radicals. The in situ-generated HBr can then serve as a Bronsted acid to activate N-unsubstituted ketimines readily for single-electron reduction to deliver α-amino radicals. As a consequence