Activation of aliphatic carbon–carbon bonds of esters and amides by rhodium(II) porphyrin
作者:Lirong Zhang、Kin Shing Chan
DOI:10.1016/j.jorganchem.2007.01.012
日期:2007.4
Aliphatic carbon–carbon bonds of esters and amides were activated successfully with rhodium(II) porphyrin radical to give rhodium(III) porphyrin alkyls in moderate yields.
Efficienttransamidation of unactivated carboxamides, phthalimides, formamides and thioamides with amines undersolvent-freeconditions using H-β-zeolite as a green and recyclable heterogeneous catalyst is described. Easy work up, high purity of the products, recyclability and environmentally-friendly nature of the catalyst are the attractive features of the present methodology. This is the first report
Stereoselectivity of cyclisations via N-acyliminium ions to form pyrido[2′,3′:3,4]pyrrolo[2,1-a]isoindole, -isoquinoline and -benz[c]azepine ring systems
作者:Abood A. Bahajaj、John M. Vernon、Giles D. Wilson
DOI:10.1039/b009316p
日期:——
Pyrido[2′,3′:3,4]pyrrolo[2,1-a]isoindole, -isoquinoline and -benz[c]azepine derivatives are obtained by heating in polyphosphoric acid (PPA) appropriate hydroxylactam precursors derived frompyridine-2,3-dicarboximides. The stereoselectivity of ring closure is rationalised by considering the development of A(1,3) strain in the cyclisation step from N-acyliminium ion intermediates.
Microwave-assisted heteropolyanion-based ionic liquids catalyzed transamidation of non-activated carboxamides with amines under solvent-free conditions
environmentally benign and highly efficient protocol for the transamidation of non-activated carboxamides with amines using heteropolyanion-based ionic liquids as catalystsunder microwave-assisted and solvent-freeconditions has been developed. As evaluated by the reactions of a structurally diverse set of amides and amines, the scope and utility of the transamidation proved to be quite general. Operational
An unprecedented approach to the Gabriel amine synthesis utilizing tosylhydrazones as alkylating agents
作者:Arvind K. Yadav、Lal Dhar S. Yadav
DOI:10.1039/c4ra05929h
日期:——
A new and one-pot version of the Gabriel phthalimide aminesynthesis utilizing carbonyl compounds as alkylating agents via their tosylhydrazone surrogates is disclosed. The alkylation involves copper catalysed carbene insertion into the N–H bond of phthalimide. Basically, the protocol also offers a powerful tool for deoxygenative hydroamination of carbonyl compounds.