Synthesis of 1,2-dihydro-1,3,5-triazine derivatives <i>via</i> Cu(<scp>ii</scp>)-catalyzed C(sp<sup>3</sup>)–H activation of <i>N</i>,<i>N</i>-dimethylethanolamine with amidines
作者:Min Yan、Renchao Ma、Rener Chen、Lei Wang、Zhiming Wang、Yongmin Ma
DOI:10.1039/d0cc03820b
日期:——
1,2-Dihydro-1,3,5-triazines and symmetrical 1,3,5-triazines were obtained in up to 81% yields from amidines and N,N-dimethylethanolamine catalyzed by CuCl2. The reaction involves three C–N bond formations during the oxidative annulation process and the mechanism was proposed. This efficient synthesis of 1,2-dihydro-1,3,5-triazines was developed for the first time.
Facile Synthesis of Polysubstituted Imidazoles through CBr<sub>4</sub>-Mediated Tandem Cyclization of Amidines with 1,3-Dicarbonyl Compounds or Ketones
A facile approach to synthesize polysubstituted imidazoles via CBr4 mediated tandem cyclization of amidine with 1,3-dicarbonyl or ketone is described. This metal-free cascade reaction employed CBr4 as promoter and was carried out with a simple operation under mild conditions.
Iron(III)/Iodine-Catalyzed C(<i>sp</i><sup>2</sup>)H Activation of α,β-Unsaturated Aldehydes/Ketones with Amidines: Synthesis of 1,2,4,5-Tetrasubstituted Imidazoles
An efficient methodology to access a library of 1,2,4,5-tetrasubstitutedimidazoles from a broad range of amidines and α,β-unsaturatedaldehydes/ketones via a C(sp2)H amination has been developed. This method represents a new and simple way to prepare highly substituted imidazoles from easily available starting materials, inexpensive catalysts, and with good functional group tolerance in good to excellent
Access to highly functionalized imidazolones bearing α-amino acid esters <i>via</i> KOH-promoted annulation of amidines, nitrosoarenes and malonic esters
作者:Wenhui Li、Jie Xin、Pingan Zhai、Jianying Lin、Shuangping Huang、Wenchao Gao、Xing Li
DOI:10.1039/d1ob00930c
日期:——
α-amino acid esters through KOH-mediated one-pot three-component annulation of amidines, nitrosoarenes and malonic esters is reported. This reaction features broad substrate scope, a cheap and readily available promoter, good to high yields for most substrates and mild reaction conditions. The mechanism study shows that the KOH-mediated formation of the imine intermediate via the reaction of nitrosoarenes
Selective Synthesis of Aminoisoquinolines via Rh(III)-Catalyzed C–H/N–H Bond Functionalization of <i>N</i>-Aryl Amidines with Cyclic 2-Diazo-1,3-diketones
C–H/N–H bond functionalization of N-aryl amidines with cyclic 2-diazo-1,3-diketones for the synthesis of 1-aminoisoquinolines has been accomplished by employing [Cp*RhCl2]2/CsOPiv as the catalyst system. This methodology proceeds by a cascade C–H activation/intramolecular cyclization under mild reaction conditions, features a broad substrate scope, and involves the formation of two new σ bonds (C–C and