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
The first highlyenantioselective CuI‐catalyzed azide‐alkyne cycloaddition (CuAAC) of tertiaryalcohols and their kineticresolution is reported. This approach allows facile access to multifunctional tertiaryalcohols featuring an α‐ethynyl or α‐triazole moiety, and represents the first successful kineticresolution of racemates with a tetrasubstituted carbon stereocenter via CuAAC. Newly developed
Chiral bicyclic guanidine catalyzes the asymmetric HâD exchange reactions. Up to 30% ee was achieved. DFT calculations were employed to elucidate and explain the origin of the reaction's stereoselectivity.
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