[EN] SYNTHESIS OF ALKYNONES VIA CARBONYLATIVE SONOGASHIRA COUPLING REACTIONS CATALYZED BY PD(II)-N-HETEROCYCLIC CARBENE-PYRIDINE COMPLEXES [FR] SYNTHÈSE D'ALKYNONES PAR RÉACTIONS DE COUPLAGE DE SONOGASHIRA CARBONYLATIF CATALYSÉES PAR DES COMPLEXES CARBÈNE-PYRIDINE PD(II)-N-HÉTÉROCYCLIQUES
combination of [Pd(allyl)Cl]2 and the azolium salt 9, containing a 3-pentyl group at N(3) position in the NHC ring, efficiently promoted the AAA reaction to afford the corresponding alkylated product 7 with 67% ee. Furthermore, it was found that the Pd/NHC ratio was an important factor; the AAA reaction with a Pd/NHC ratio of 1:1 took place smoothly, whereas utilization of a Pd/NHC ratio of 1:2 resulted
The synthesis of twelve new palladiumallylcomplexes bearing benzimidazole-based NHC (NHC = N-heterocyclic carbene) ligands is reported. All the complexes were characterized by NMR and elemental analysis and, in the case of complex 5c, it was possible to confirm the connectivity by single crystal X-ray diffraction. The cationic palladiumallylcomplexes were tested toward 5 different cancer lines
Copper-Catalyzed Synthesis of 2-Unsubstituted, <i>N</i>-Substituted Benzimidazoles
作者:Keiichi Hirano、Akkattu T. Biju、Frank Glorius
DOI:10.1021/jo902160y
日期:2009.12.18
An efficient copper-catalyzed intramolecular arylation of formamidines forming 2-unsubstituted benzimidazoles in excellent yields is reported. Sixteen examples bearing sterically demanding substituents on nitrogen like Mes, 2,6-diisopropylphenyl, or 2-tert-butylphenyl and tolerating various functional groups demonstrate the utility of this method.
Direct synthesis of N-phosphanyl-heterocyclic carbenes
作者:Anatolii P. Marchenko、Heorgii N. Koidan、Igor I. Pervak、Anastasiia N. Huryeva、Evgeniy V. Zarudnitskii、Andrei A. Tolmachev、Aleksandr N. Kostyuk
DOI:10.1016/j.tetlet.2011.11.054
日期:2012.2
A direct method for the synthesis of N-phosphanyl-heterocyclic carbenes is described. The method is based on the reaction of lithium imidazolides and benzimidazolides having a bulky alkyl group at the nitrogen atom with di(tert-butyl)chlorophosphine leading directly to the carbenes. (C) 2011 Elsevier Ltd. All rights reserved.
Gonzalez; Alarcon; Cabildo, European Journal of Medicinal Chemistry, 1985, vol. 20, # 4, p. 359 - 362