Direct α-Fluorination of Ketones Using N-F Reagents
作者:Stojan Stavber、Marjan Jereb、Marko Zupan
DOI:10.1055/s-2002-35625
日期:——
bis(tetrafluoroborate) (Accufluor NFTh) as a fluorine atom transfer reagent and methanol as solvent enabled direct regiospecific fluorofunctionalization of the u-carbonyl position in ketones without prior activation of the target molecules. Methoxy or hydroxy substituted derivatives of 1-indanone, 1-tetralone and oxo derivatives of thiophene, benzo[b]thiophene, benzofuran and benzopyran were regiospecifically
Catalytic Asymmetric Mannich Reactions with Fluorinated Aromatic Ketones: Efficient Access to Chiral β-Fluoroamines
作者:Barry M. Trost、Tanguy Saget、Andreas Lerchen、Chao-I Joey Hung
DOI:10.1002/anie.201509719
日期:2016.1.11
herein is a Zn/Prophenol‐catalyzed Mannich reactionusing fluorinated aromatic ketones as nucleophilic partners for the direct enantio‐ and diastereoselective construction of β‐fluoroamine motifs featuring a fluorinated tetrasubstituted carbon. The reaction can be run on a gram scale with a lowcatalystloading without impacting its efficiency. Moreover, a related aldolreaction was also developed. Together
Palladium-Catalyzed Enantioselective α-Arylation of α-Fluoroketones
作者:Zhiwei Jiao、Jason J. Beiger、Yushu Jin、Shaozhong Ge、Jianrong Steve Zhou、John F. Hartwig
DOI:10.1021/jacs.6b09580
日期:2016.12.14
carbonyl compounds is a widely practiced method for C-C bondformation. Several enantioselective versions of this process have been reported, but intermolecular, enantioselective coupling reactions of aryl electrophiles with α-fluoro carbonyl compounds have yet to be disclosed. We report enantioselective coupling of aryl and heteroaryl bromides and triflates with α-fluoroindanones catalyzed by palladium
A straightforward access to novel families of enantioenriched cis-monofluorinated carbocyclic alcohols has been developed through ruthenium-catalyzedasymmetrictransferhydrogenation/dynamic kinetic resolution that proceeded in high diastereo- and enantioselectivities. Valuable enantioenriched vicinal difluorinated heterocycles and carbocycles, such as trans-difluorinated indans, tetrahydronaphthalenes