[(NHC)Au<sup>I</sup>]-Catalyzed Rearrangement of Allylic Acetates
作者:Nicolas Marion、Ronan Gealageas、Steven P. Nolan
DOI:10.1021/ol070843w
日期:2007.7.1
[(NHC)AuCl] complexes (NHC = N-heterocycliccarbene), in conjunction with a silver salt, were found to efficiently catalyze the rearrangement of allylic acetates under both conventional and microwave-assisted heating. The optimization of several reaction parameters (solvent, silver salt, and ligand) as well as a study of the reaction scope are reported. The steric hindrance of the ligand bound to gold was
Syntheses of gem-difluorocyclopropyl ketones (3a–d) and their reactions with nucleophiles are described. Ring opening reactions of 3a,c and d with a methanolate and a thiolate anion took entirely different courses of bond scission of the cyclopropane ring.
Palladium-catalyzed regio- and diastereo-selective allylic alkylation using 2-(diphenylphosphino)benzoic acid: construction of vicinal quaternary and tertiary carbon centers
The palladium-catalyzed regio- and diastereo-selective allylic alkylation of allyl acetates with carbon nucleophiles occurred. The stereochemistry was highly controlled by the palladium catalyst with 2-(diphenylphosphino)benzoic acid as the ligand, and vicinal quaternary and tertiary carboncenters were constructed.
Substitution of allylic acetates with sodium para-toluenesulfinate in aqueous media using allylpalladium chloride dimer and a water-soluble ligand as the catalytic system; electrospray ionisation mass spectrometry analysis
作者:Carole Chevrin、Jean Le Bras、Anna Roglans、Dominique Harakat、Jacques Muzart
DOI:10.1039/b613562e
日期:——
The allylic substitution of allylic acetates by sodium para-toluenesulfinate in aqueous media was catalyzed by [(η3-allyl)PdCl]2 associated with [(HOCH2CH2NHCOCH2)2NCH2]2. High yields could be obtained but the recycling of the catalytic system proved to be weakly effective. ESI-MS analysis has led to the suggestion of a possible catalytic cycle involving a PdIV intermediate.
Enantioselective C3‐Allylation of Pyridines via Tandem Borane and Palladium Catalysis
作者:Jun‐Jie Tian、Rui‐Rui Li、Gui‐Xiu Tian、Xiao‐Chen Wang
DOI:10.1002/anie.202307697
日期:2023.8.21
A one-pot, three-step method for highly enantioselective C3-allylation reactions of pyridines was developed. The method involved borane-catalyzed dearomative pyridine hydroboration, palladium-catalyzed enantioselective allylation of the dearomatized intermediate, and finally oxidation by air. The method was applicable to a broad range of pyridines, N-heteroarenes, and allylic esters.