Nickel-catalysed sequential amination of aryl- and heteroaryl di- and trichlorides
作者:Christophe Desmarets、Raphaël Schneider、Yves Fort
DOI:10.1016/s0040-4020(01)00730-x
日期:2001.9
Unsymmetrical 1,3-diaminobenzenes and diaminopyridines were efficiently prepared by reaction of 3-chloroanilines and chloroaminopyridines with amines via a nickel-catalysedamination. The Ni/2,2′-bipyridine catalyst is also effective for the sequential amination of aryl trichlorides. After a first selective monoamination of 1,3,5-trichlorobenzene, the obtained 3,5-dichloroanilines were subsequently transformed
Selective Cleavage and Tunable Functionalization of the C–C/C–N Bonds of <i>N</i>-Arylpiperidines Promoted by <sup><i>t</i></sup>BuONO
作者:Yan He、Zhi Zheng、Yajie Liu、Jiajie Qiao、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.9b00226
日期:2019.3.15
In this paper, selectivecleavage and tunable functionalization of the inert C–C/C–N bonds in N-arylpiperidines promoted by tBuONO under metal-free conditions is presented. To be specific, when the reaction was run in acetonitrile in the presence of molecular sieves, the synthetically useful acyclic N-formyl nitriles are formed. On the other hand, when alcohol was used as the reaction medium, the corresponding
desaturative β-C(sp3)−H acylation of cyclic N-aryl amines has been developed to access the desired β-substituted enamines with excellent levels of chemo- and regioselectivityundermildconditions. This procedure proved to be a powerful route to the late-stage modification of natural products and derivatives.
Synthesis of β-Dicarbonylated Tetrahydropiperidines via Direct Oxidative Cross-Coupling between Different C(sp<sup>3</sup>)–H Bonds
作者:Fang Wang、Xinying Zhang、Yan He、Xuesen Fan
DOI:10.1021/acs.joc.9b02924
日期:2020.2.21
followed by their radical addition and further oxidation of the addition adduct. To our knowledge, this is the first example in which β-dicarbonyl-substituted tetrahydropiperidines were prepared using readily available saturated cyclic amines as substrates and inexpensive and ubiquitous methyl ketones as dicarbonylation reagents. In addition, the product thus obtained could be easily transformed into