Bis(oxazoline) and Bis(oxazolinyl)pyridine Copper Complexes as Enantioselective Diels−Alder Catalysts: Reaction Scope and Synthetic Applications
作者:David A. Evans、David M. Barnes、Jeffrey S. Johnson、Thomas Lectka、Peter von Matt、Scott J. Miller、Jerry A. Murry、Roger D. Norcross、Eileen A. Shaughnessy、Kevin R. Campos
DOI:10.1021/ja991191c
日期:1999.8.1
the use of this chiral catalyst in more complex Diels−Alder processes, are described. Similarly, the cationic coppercomplex 9a, [Cu((S,S)-t-Bu-pybox)](SbF6)2, is effective in the Diels−Alder reactions of monodentate acrolein dienophiles while the closely related complex, 9d [Cu((S,S)-Bn-pybox)](SbF6)2, is the preferred Lewis acid catalyst for acrylate dienophiles in reactions with cyclopentadiene.
Several chiral hydroxyoxazolines have been prepared starting from (1S)-(+)-ketopinic acid and enantiopure β-amino alcohols by short synthetic routes. They have been employed in the catalytic asymmetric Diels-Alder reaction, resulting in ee values of up to 90%.
Synthesis of Novel Dendritic 2,2‘-Bipyridine Ligands and Their Application to Lewis Acid-Catalyzed Diels−Alder and Three-Component Condensation Reactions
作者:Takahito Muraki、Ken-ichi Fujita、Masato Kujime
DOI:10.1021/jo070767a
日期:2007.10.1
dendritic Cu(OTf)2 catalysts were used for Diels−Alder and three-component condensationreactions. The dendritic Cu(OTf)2-catalyzed Diels−Alder reaction proceeded smoothly, and these dendritic catalysts could be recycled without deactivation by reprecipitation. Three-component condensationreactions such as Mannich-type reactions also proceeded not only in dichloromethane but also in water. Furthermore
The Preparation and Utility of Bis(sulfinyl)imidoamidine Ligands for the Copper-Catalyzed Diels−Alder Reaction
作者:Timothy D. Owens、Andrew J. Souers、Jonathan A. Ellman
DOI:10.1021/jo020524c
日期:2003.1.1
The design and preparation of a novel class of ligands based on the sulfinyl imine functionality is described. In particular, an efficient and modular synthesis of bis(sulfinyl)imidoamidine (siam) ligands is reported. The versatility of the synthetic sequence is demonstrated by the preparation of various analogues to explore the effect of substitution about the ligand framework on catalytic activity
Ethylene-linked bis(phenol) ligands: efficient synthesis, Ti(IV) coordination chemistry, and Lewis acid catalysis
作者:Jeffrey W Anthis、Andrew O Larsen、Peter S White、Michel R Gagné
DOI:10.1016/j.jorganchem.2003.08.046
日期:2003.12
We report herein an efficient synthesis of a series of chelating bis(aryloxide) ligands that can be diverged at a late stage to generate a variety of structures. Based on structural differences between linked and unlinked analogs of six-coordinate acid–base adducts of (ArO)2TiCl2(dmpe), a hypothesis predicted that a difference between the two structure types would be apparent when the compounds shuttled