Diastereoselective, multicomponent access to trans-2-aryl-4-arylamino-1,2,3,4-tetrahydroquinolines via an AA′BC sequential four-component reaction and their application to 2-arylquinoline synthesis
Effect of Ancillary Ligand in Cyclometalated Ru(II)–NHC-Catalyzed Transfer Hydrogenation of Unsaturated Compounds
作者:Somnath Bauri、S. N. R. Donthireddy、Praseetha Mathoor Illam、Arnab Rit
DOI:10.1021/acs.inorgchem.8b02246
日期:2018.12.3
transfer hydrogenation of carbonyl substrates. The electron-rich precatalyst, 2c, containing p-OMe-substituted NHCligand performed significantly better than both unsubstitutedcomplex 2a and p-CF3 substituted electron-poor complex 2b in ketone reduction. Whereas bulky mesoionic triazolylidene ligandcontainingcomplex 4 was found to be superior catalyst for aldehyde reduction and the precatalyst 2a
Heteroditopic Ru(II)– and Ir(III)–NHC Complexes with Pendant 1,2,3-Triazole/Triazolylidene Groups: Stereoelectronic Impact on Transfer Hydrogenation of Unsaturated Compounds
作者:Praseetha Mathoor Illam、S. N. R. Donthireddy、Sayantan Chakrabartty、Arnab Rit
DOI:10.1021/acs.organomet.9b00156
日期:2019.7.8
established as important classes of carbeneligands in homogeneous catalysis. To develop Ru(II)/Ir(III) complexes based on these ligand systems considering their electronic as well as steric profiles for hydride transfer reactions, we employed chelatingligands featuring combinations of ImNHC and triazole-N or mesoionic tzNHC donors bridged by a CH2 spacer with possible modifications at triazole backbone. In
Diastereoselective, multicomponent access to trans-2-aryl-4-arylamino-1,2,3,4-tetrahydroquinolines via an AA′BC sequential four-component reaction and their application to 2-arylquinoline synthesis
作者:Pascual Ribelles、Vellaisamy Sridharan、Mercedes Villacampa、Mª Teresa Ramos、J. Carlos Menéndez
DOI:10.1039/c2ob26754c
日期:——
The CAN-catalyzed reaction between 3,5-disubstituted anilines, vinyl ethers and aromatic aldehydes leads to trans-2-aryl-4-arylaminotetrahydroquinolines, in an AAâ²BC sequential multicomponent transformation related to the Povarov reaction that was also extended to the use of a second aniline as the C-4 substituent. The unusual trans stereochemistry was explained by stabilization of the corresponding intermediate by intramolecular hydrogen bonding. The presence of the 4-anilino substituent allowed adapting the method to the synthesis of 4-unsubstituted 2-arylquinolines, by treatment of the crude product from the MCR with FeCl3 in methanol.
Catalyst- and solvent-free efficient access to <i>N</i>-alkylated amines <i>via</i> reductive amination using HBpin
作者:Vipin K. Pandey、Somnath Bauri、Arnab Rit
DOI:10.1039/d0ob00740d
日期:——
conditions for the synthesis of structurallydiverse secondary amines has been uncovered. This one-pot protocol works efficiently at room temperature and is compatible with a wide range of sterically and electronically diversealdehydes and primary amines. Notably, this simple process offers scalability, excellent functional group tolerance, chemoselectivity, and is also effective at the synthesis of biologically
Hydrogen transfer reaction to imines with 2-propanol catalyzed by ruthenium (II) complexes containing nitrogen-phosphorus (NPN) ligands. Experimental and computational studies
作者:Camila Negrete-Vergara、Andrés Vega、Plinio Cantero-López、Osvaldo Yáñez、Sergio A. Moya、Gonzalo Valdebenito、Sebastián Parra-Melipan、Pedro Aguirre
DOI:10.1016/j.ica.2024.122064
日期:2024.8
RuCl(CO)PPh(L1) () and RuCl(CO)PPh(L2) () complexes were non-active in the reaction studied. Theoretical calculations conducted for complex showed that the carbonyl group promotes σ-orbital interactions and backdonation phenomena from the metal centre to the π* orbitals in the CO ligand, presenting a strong orbital contribution. This supports the hypothesis that complexes and are less reactive species and