Robust Buchwald–Hartwig amination enabled by ball-milling
作者:Qun Cao、William I. Nicholson、Andrew C. Jones、Duncan L. Browne
DOI:10.1039/c8ob01781f
日期:——
An operationally simple mechanochemical method for the Pd catalysed Buchwald–Hartwig amination of arylhalides with secondary amines has been developed using a Pd PEPPSI catalyst system.
Boron-Catalyzed N-Alkylation of Amines using Carboxylic Acids
作者:Ming-Chen Fu、Rui Shang、Wan-Min Cheng、Yao Fu
DOI:10.1002/anie.201503879
日期:2015.7.27
A boron‐based catalyst was found to catalyze the straightforward alkylation of amines with readily available carboxylic acids in the presence of silane as the reducing agent. Various types of primary and secondary amines can be smoothly alkylated with good selectivity and good functional‐group compatibility. This metal‐free amine alkylation was successfully applied to the synthesis of three commercial
Formal anti-Markovnikov hydroamination of terminal olefins
作者:Sarah M. Bronner、Robert H. Grubbs
DOI:10.1039/c3sc51897c
日期:——
A new strategy to access linear amines from terminal olefin precursors is reported. This two-step, one-pot hydroamination methodology employs sequential oxidation and reduction catalyticcycles. The formal hydroamination transformation proceeds with excellent regioselectivity, and only the anti-Markovnikov product is observed. Up to 70% yield can be obtained from styrenes or aliphatic olefins and either
Reaction of Nitrogen‐Radicals with Organometallics Under Ni‐Catalysis: N‐Arylations and Amino‐Functionalization Cascades
作者:Lucrezia Angelini、Jacob Davies、Marco Simonetti、Laia Malet Sanz、Nadeem S. Sheikh、Daniele Leonori
DOI:10.1002/anie.201900510
日期:2019.4
the generation of nitrogen‐radicals by ground‐state single electron transfer with organyl–NiI species. Depending on the philicity of the N‐radical, two types of processes have been developed. In the case of nucleophilic aminyl radicals direct N‐arylation with aryl organozinc, organoboron, and organosilicon reagents was achieved. In the case of electrophilic amidyl radicals, cascade processes involving
A Catalyst-Free Amination of Functional Organolithium Reagents by Flow Chemistry
作者:Heejin Kim、Yuya Yonekura、Jun-ichi Yoshida
DOI:10.1002/anie.201713031
日期:2018.4.3
of functional organolithium intermediates with well‐designed aminating reagents under mild reaction conditions using flow microreactors. The aminating reagents were optimized to achieve efficient C−N bond formation without using any catalyst. The electrophilic amination reactions of functionalized aryllithiums were successfully conducted under mild reaction conditions, within 1 minute, by using flow