Solution Phase, Solid State, and Theoretical Investigations on the MacMillan Imidazolidinone
作者:John B. Brazier、Gareth Evans、Timothy J. K. Gibbs、Simon J. Coles、Michael B. Hursthouse、James A. Platts、Nicholas C. O. Tomkinson
DOI:10.1021/ol802512y
日期:2009.1.1
A combination of solution phase NMR, X-ray crystallographic studies, and DFT calculations provide a consistent structural conformation for Iminium Ions derived from the MacMillan imidazolidinone.
5-Substituted (5S)-imidazolidin-4-ones as effective chiral auxiliary for hydrogenation of ?-keto amides
作者:Igor Solodin
DOI:10.1007/bf00816850
日期:——
The title chiral auxiliary was used for asymmetric catalytic hydrogenation of amides derived from phenylglyoxylic acid to give mandelamides with high diastereoselectivity (diastereoisomeric excess, d. e. up to 96%).
Influence des ultrasons sur la diastéréosélectivité. Synthèse d'imidazolidine-4-one chirales
作者:Cathy Hubert、Bernard Garrigues
DOI:10.1139/cjc-76-2-234
日期:——
A three-step synthesis of imidazolidine-4-one has been realized. Sodium dithionite was a very efficient reagent for the last step, the reduction of a ketone. The reaction is slow under the normal conditions of heating and its diastereoselectivity is poor. Under the influence of ultrasound, the selectivity and the yield are very good. The use of sodium dithionite makes it possible to work in water and to avoid the use of hydrides.
Aromatic Interactions in Organocatalyst Design: Augmenting Selectivity Reversal in Iminium Ion Activation
作者:Mareike C. Holland、Jan Benedikt Metternich、Constantin Daniliuc、W. Bernd Schweizer、Ryan Gilmour
DOI:10.1002/chem.201500270
日期:2015.7.6
that intermolecular aromatic (CH–π and cation–π) interactions between the incipient iminium cation and the indole ring system is key to rationalising selectivityreversal. This is absent in the N‐methylpyrrole alkylation, thus forming the basis of two competing enantio‐induction pathways. A simple L‐valine catalyst has been developed that significantly augments this interaction.
Straightforward Synthesis of Fluorinated Enals <i>via</i> Photocatalytic α-Perfluoroalkenylation of Aldehydes
作者:Christian Wulkesch、Constantin Czekelius
DOI:10.1021/acs.joc.1c00383
日期:2021.6.4
(Per)fluorinated substances represent an important compound class with regard to drug design and material chemistry. We found a mild, operationally simple, and inexpensive photocatalytic perfluoroalkenylation reaction giving tetrasubstituted, highly electron-deficient enals straight from aldehydes. This one-step reaction tolerates various functional groups and can be applied to a wide range of substrates