Enantioselective Synthesis of 4-Substituted Dihydrocoumarins through a Zinc Bis(hydroxyamide)-Catalyzed Conjugate Addition of Terminal Alkynes
作者:Gonzalo Blay、M. Carmen Muñoz、José R. Pedro、Amparo Sanz-Marco
DOI:10.1002/adsc.201201120
日期:2013.4.15
A new enantioselective catalyst for the conjugateaddition of terminalalkynes has been developed. Terminalalkynes react with 3‐alkoxycarbonylcoumarins in the presence of diethylzinc and bis(hydroxyamide) ligands to give chiral non‐racemic dihydrocoumarins substituted with an alkynyl group on the C‐4 position with good yields and enantiomeric excesses up to 95%.
Design and Evaluation of Inclusion Resolutions, Based on Readily Available Host Compounds
作者:Simona Müller、Marcel Cyrus Afraz、René de Gelder、Gerry J. A. Ariaans、Bernard Kaptein、Quirinus B. Broxterman、Alle Bruggink
DOI:10.1002/ejoc.200400613
日期:2005.3
of enantiomers through selective crystallisation of diastereomeric inclusioncompounds can extend the scope of traditional racemate resolution beyond salt forming compounds. To assess the practical value of this approach the literature was carefully screened and promising results were checked. Also an extensive range of new inclusion hosts suitable for resolution processes, derived from simple hydroxyand
Enantioselective zinc-mediated conjugate alkynylation of saccharin-derived 1-<i>aza</i>-butadienes
作者:Gonzalo Blay、Alvaro Castilla、David Sanz、Amparo Sanz-Marco、Carlos Vila、M. Carmen Muñoz、José R. Pedro
DOI:10.1039/d0cc04221h
日期:——
Diethylzinc and a bis(hydroxyl)malonamide ligand allow the first conjugate alkynylation of α,β-unsaturated imines. Excellent enatioselectivities are obtained with aliphatic alkynes.