Search
Now showing items 11-15 of 15
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. ...