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Now showing items 21-26 of 26
Catalytic Enantioselective Transannular Morita–Baylis–Hillman Reaction
(American Chemical Society, 2019)
Catalytic and enantioselective approaches to transannular reactions are very limited and mostly are based on chiral Lewis acid catalyzed pericyclic reactions. In this report, we present an efficient and straightforward ...
Ion-pairing catalysis in the enantioselective addition of hydrazones to N-acyldihydropyrrole derivatives
(Royal Society of Chemistry, 2018-07-16)
We have demonstrated that dihydropyrrole-based enamide derivatives can act as efficient precursors of chiral quaternary N-acyliminium salts under Brønsted acid catalysis that undergo reactions with hydrazones, the latter ...
Favoring Trienamine Activation through Unconjugated Dienals: Organocatalytic Enantioselective Remote Functionalization of Alkenes
(Wiley-VCH, 2014-01-29)
Unconjugated 2,5-dienals are more reactive substrates
than the corresponding fully conjugated a,b,g,dunsaturated
aldehydes towards organocatalytic activation
through trienamine intermediates. This difference in ...
Catalytic Generation of Donor-Acceptor Cyclopropanes under N-Heterocyclic Carbene Activation and their Stereoselective Reaction with Alkylideneoxindoles
(Wiley-VCH, 2017-04-10)
Formylcyclopropanes undergo activation
in the presence of an N-heterocyclic carbene catalyst
generating a donor-acceptor cyclopropane intermediate
with the ability to undergo ring-opening
followed by formal [4+2] ...
Enantioselective Oxidative (4+3) Cycloadditions between Allenamides and Furans through Bifunctional Hydrogen-Bonding/Ion-Pairing Interactions
(Wiley-VCH, 2017-07-03)
BINOL-based N-trifluoromethanesulfonyl phosphoramides
catalyze the enantioselective (4+3) cycloaddition
between furans and oxyallyl cations, the latter being generated
in situ by oxidation of allenamides. The chiral ...
Regioselectivity Change in the Organocatalytic Enantioselective (3+2) Cycloaddition with Nitrones Through Cooperative Hydrogen-Bonding Catalysis/Iminium Activation.
(Wiley-VCH, 2017-01-12)
The reaction of nitrones with enals through iminium
activation can be modulated by using cooperative
hydrogen-bonding catalysis to induce the participation of
a nitrone ylide (C-N-C) instead of the classical C-N-O
dipole. ...