Asymmetric hetero‐Diels‐Alder Reaction of
<i>trans</i>
‐1‐Methoxy‐3‐trimethylsilyloxy‐buta‐1,3‐diene Catalyzed by Zinc Complexes
作者:Matylda Stefaniak、Szymon Buda、Jacek Mlynarski
DOI:10.1002/ejoc.202000822
日期:2020.9.7
Catalyticasymmetric hetero‐Diels‐Alder (hDA) reaction of Danishefsky diene with α‐carbonyl esters have been performed with a zinc‐based catalyst that is readily available from zinc triflate and bisoxazoline ligands.
A versatile catalyst for asymmetric reactions of carbonyl groups working purely by activation through hydrogen bonding: Mukaiyama-aldol, hetero Diels–Alder and Friedel–Crafts reactions
作者:Wei Zhuang、Thomas B. Poulsen、Karl Anker Jørgensen
DOI:10.1039/b507778h
日期:——
to be promising candidates for the efficient activation of carbonyl compounds throughhydrogenbonding. Exemplified by three carbonyl addition reactions: Mukaiyama-aldol, hetero Diels-Alder and Friedel-Crafts reactions we show that bis-triflamides or bis-nonaflamides of commercially available chiral diamines act as chiral Bronsted-acid catalysts, leading to the optically active products in moderate
The first highly enantioselective catalytic hetero-Diels–Alder reaction of ketones
作者:Mogens Johannsen、Sulan Yao
DOI:10.1039/a706463b
日期:——
The first highly enantioselective catalytic hetero-DielsâAlder reaction of various aliphatic and aromatic ketones with an activated conjugated diene catalysed by chiral copper(II) complexes with enantiomeric excesses up to 99% is presented.
Effects of Extended Aryl-Substituted Bisoxazoline Ligands in Asymmetric Synthesis - Efficient Synthesis and Application of 4,4′-Bis(1-Naphthyl)-, 4,4′-Bis(2-Naphthyl)- and 4,4′-Bis(9-Anthryl)-2,2′-isopropylidenebis(1,3-oxazolines)
作者:Hester L. van Lingen、Floris L. van Delft、Roy P. M. Storcken、Koen F. W. Hekking、Anouk Klaassen、Jan J. M. Smits、Patrycja Ruskowska、Jadwiga Frelek、Floris P. J. T. Rutjes
DOI:10.1002/ejoc.200500566
日期:2005.12
The steric influence of extended aryl substituents on 2,2′-bis(1,3-oxazoline) ligands was investigated in a series of asymmetric catalytic reactions such as Mukaiyama aldol and Michael reactions, hetero-Diels–Alder processes, and allylic alkylation reactions. 4,4′-(2-Naphthyl)- and 4,4′-(9-anthryl)-substituted isopropylidene-bridged 2,2′-bis(1,3-oxazolines) were synthesized and their enantioselective