Gold(I)-Catalyzed Enantioselective Intramolecular Dehydrative Amination of Allylic Alcohols with Carbamates
作者:Paramita Mukherjee、Ross A. Widenhoefer
DOI:10.1002/anie.201107877
日期:2012.2.6
Aliphatic nitrogen heterocycles—either five‐ or six‐membered—are formed in high yield and with up to 94 % ee when a 1:2 mixture of [(S)‐2](AuCl)2 and AgClO4 is used as the catalyst for the title reaction.
Gold(I)-Catalyzed Enantioselective Hydroamination of <i>N</i>-Allenyl Carbamates
作者:Zhibin Zhang、Christopher F. Bender、Ross A. Widenhoefer
DOI:10.1021/ol071108n
日期:2007.7.1
mixture of [(S)-1]Au2Cl2 [(S)-1 = (S)-3,5-t-Bu-4-MeO-MeOBIPHEP] and AgClO4 in m-xylene at -40 degrees C for 24 h led to isolation of 2-vinylpyrrolidine 3a in 97% yield with 81% ee. Gold(I)-catalyzedenantioselectivehydroamination was effective for a number of carbamate groups and tolerated terminal disubstitutution of the allenyl moiety.
C3-Symmetric tris(binaphthyl) phosphite ligands: Correlation of structural properties with performance in enantioselective palladium and gold catalysis
作者:Fanji Kong、Aaron A. Ruch、Matthew C. Ellison、Vladimir N. Nesterov、LeGrande M. Slaughter
DOI:10.1016/j.poly.2024.116903
日期:2024.5
palladium-catalyzed asymmetric Suzuki-Miyaura coupling reactions and gold-catalyzed asymmetric intramolecular hydroamination of allenes. The nature of the 2ʹ-substituent had a strong effect on yields and enantioselectivities in both reactions, with phosphites bearing CF-substituted aryl groups performing best and giving up to 52–53% ee. Crystalstructures of two phosphites and three gold(I) phosphite complexes
The intramolecular gold-catalyzed asymmetric hydroamination of allenes was studied by screening a series of mononuclear gold(I) and -(III) complexes in combination with silver salts. Among the various chiral monophosphine and diaminocarbene ligands tried, the best catalysts arose from mononuclear gold(I) complexes synthesized from BINOL-based phosphoramidite ligands. The latest were improved by addition of bulky substituents at specific positions of the BINOL scaffold. The resulting gold(I) complexes were combined with selected silver salts to afford efficient catalysts for intramolecular hydroamination of allenes at room temperature or below, with good conversions and enantioselectivities.
Silver-Catalysed Enantioselective Addition of OH and NH Bonds to Allenes: A New Model for Stereoselectivity Based on Noncovalent Interactions
作者:Jannine L. Arbour、Henry S. Rzepa、Julia Contreras-García、Luis A. Adrio、Elena M. Barreiro、King Kuok Mimi Hii
DOI:10.1002/chem.201200547
日期:2012.9.3
complexes to catalyse the enantioselective addition of OH and NHbonds to allenes is demonstrated for the first time by using optically active anionic ligands that were derived from oxophosphorus(V) acids as the sources of chirality. The intramolecular addition of acids, alcohols, and amines to allenes can be achieved with up to 73 % ee. The exploitation of a CH anomeric effect allowed the absolute configuration