An Annulative Electrophilic Amination Approach to 3-Aminobenzoheteroles
摘要:
A copper-catalyzed annulative amination approach to 3-aminobenzofurans and -indoles from o-alkynylphenols and -anilines has been developed. The Cu-based catalysis is based on an umpolung, electrophilic amination with O-benzoyl hydroxylamines and enables the mild and convergent synthesis of various 3-aminobenzoheteroles of biological and pharmaceutical interest. Some mechanistic investigations and an application of this protocol to construction of more complex tricyclic framework are also described.
Copper-Catalyzed Amino Lactonization and Amino Oxygenation of Alkenes Using <i>O</i>-Benzoylhydroxylamines
作者:Brett N. Hemric、Kun Shen、Qiu Wang
DOI:10.1021/jacs.6b02840
日期:2016.5.11
A copper-catalyzed amino lactonization of unsaturated carboxylic acids has been achieved as well as the analogous intermolecular three-component amino oxygenation of olefins. The transformation features mild conditions and a remarkably broad substrate scope, offering a novel and efficient approach to construct a wide range of amino lactones as well as 1,2-amino alcohol derivatives. Mechanistic studies
Palladium-Catalyzed Norbornene-Mediated Tandem <i>ortho</i>-C–H-Amination/<i>ipso</i>-C–I-Cyanation of Iodoarenes: Regiospecific Synthesis of 2-Aminobenzonitrile
作者:Biju Majhi、Brindaban C. Ranu
DOI:10.1021/acs.orglett.6b02113
日期:2016.9.2
Efficient tandem ortho-C–H-amination/ipso-cyanation of iodoarenes was accomplished under a norbornene-mediated Pd-catalyzed process. A series of functionalized 2-aminobenzonitriles with much potential in the pharmaceutical industry were obtained by this protocol. This strategy was successfully employed for substitution with two cyano and four amino functionalities in an arene unit in one step under
Copper-catalyzed intermolecular oxyamination of olefins using carboxylic acids and <i>O</i>-benzoylhydroxylamines
作者:Brett N Hemric、Qiu Wang
DOI:10.3762/bjoc.12.4
日期:——
This paper reports a novel approach for the direct and facile synthesis of 1,2-oxyamino moieties via an intermolecular copper-catalyzed oxyamination of olefins. This strategy utilizes O-benzoylhydroxylamines as an electrophilic amine source and carboxylic acids as a nucleophilic oxygen source to achieve a modular difunctionalization of olefins. The reaction proceeded in a regioselective manner with
Copper-Catalyzed Deoxygenative C-2 Amination of Quinoline <i>N</i>
-Oxides
作者:Zhihui Wang、Man-Yi Han、Pinhua Li、Lei Wang
DOI:10.1002/ejoc.201800963
日期:2018.11.25
An unprecedented reaction between quinolineN‐oxides with O‐benzoylhydroxylamines was developed by using CuCl as catalyst, generating deoxygenative products of 2‐aminoquinolines in good yields. 1,2‐Dichloroethane (DCE) as solvent also served as reducing agent to cleave the N–O bond with no additional reductant needed in the reaction.
Mechanistic Studies of the Copper-Catalyzed Electrophilic Amination of Diorganozinc Reagents and Development of a Zinc-Free Protocol
作者:Matthew J. Campbell、Jeffrey S. Johnson
DOI:10.1021/ol0702829
日期:2007.4.1
mechanism for the copper-catalyzed amination of diorganozincreagents by O-benzoyl-N,N-dialkylhydroxylamines is supported by following stereochemically defined organometallics through the reaction and by employing the endocyclic restriction test. A copper-catalyzed electrophilic amination of organomagnesium compounds is also described in which the use of zinc halides has been eliminated.