Highly Modular Synthesis ofC1-Symmetric Aminosulfoximines and Their Use as Ligands in Copper-Catalyzed Asymmetric Mukaiyama-Aldol Reactions
作者:Martin Langner、Pauline Rémy、Carsten Bolm
DOI:10.1002/chem.200500497
日期:2005.10.21
The development of C1-symmetricaminosulfoximines, their highly modular synthesis, and their application in enantioselective copper-catalyzed Mukaiyama-type aldolreactions between pyruvates and enolsilanes is described. In this context, the influence of the ligand architecture as well as the optimization of the reaction conditions are discussed. In detail, the dependence of the catalyst efficiency
The Synthesis of Chiral Benzothiazine and Thiazinoquinoline Derivatives
作者:Long Wang、Daniel L. Priebbenow、Xiao Yun Chen、Fang-Fang Pan、Carsten Bolm
DOI:10.1002/ejoc.201500250
日期:2015.5
3-aminoacetophenone and (S)-S-methyl-S-phenylsulfoximine. By using a short reaction sequence, the 8-amino-2,1-benzothiazine derivative was readily prepared, which served as a valuable intermediate for the synthesis of additional derivatives. Initial experiments show that employing such compounds in copper-catalyzedasymmetricMukaiyama-typealdolreactions provided products with moderate enantioselectivity.
An efficient Cu(<scp>ii</scp>)-bis(oxazoline)-based polymer immobilised ionic liquid phase catalyst for asymmetric carbon–carbon bond formation
作者:Simon Doherty、Julian G. Knight、Jack R. Ellison、Peter Goodrich、Leanne Hall、Christopher Hardacre、Mark J. Muldoon、Soomin Park、Ana Ribeiro、Carlos Alberto Nieto de Castro、Maria José Lourenço、Paul Davey
DOI:10.1039/c3gc41378k
日期:——
The asymmetric DielsâAlder reaction between N-acryloyloxazolidinone and cyclopentadiene and the Mukaiyama-aldol reaction between methylpyruvate and 1-phenyl-1-trimethylsilyloxyethene have been catalysed by heterogeneous copper(II)-bis(oxazoline)-based polymer immobilised ionic liquid phase (PIILP) systems generated from a range of linear and cross linked ionic polymers. In both reactions selectivity and ee were strongly influenced by the choice of polymer. A comparison of the performance of a range of Cu(II)-bis(oxazoline)-PIILP catalyst systems against analogous supported ionic liquid phase (SILP) heterogeneous catalysts as well as their homogeneous counterparts has been undertaken and their relative merits evaluated.
Comparison of immobilized Box and azaBox–Cu(II) complexes as catalysts for enantioselective Mukaiyama aldol reactions
作者:J FRAILE、I PEREZ、J MAYORAL
DOI:10.1016/j.jcat.2007.09.010
日期:2007.12.10
Enantioselective Mukaiyamaaldolreactions of different α-ketoesters was tested with copper complexes of chiral Box and azaBox ligands in both homogeneous and heterogeneous systems. Results in the homogeneous reactions were greatly influenced by the nature of the ketoester, the chiral ligand, and the reaction solvent. In the case of supported catalysts, the use of strongly coordinating azaBox ligands
Multipurpose box- and azabox-Based Immobilized Chiral Catalysts
作者:José M. Fraile、Ignacio Pérez、José A. Mayoral、Oliver Reiser
DOI:10.1002/adsc.200606121
日期:2006.8
Azabis(oxazolines) can be used as chiral ligands in the copper-catalyzed enantioselectiveMukaiyamaaldol reaction. When supported on solids, azabis(oxazoline)-copper complexes are more easily deactivated than their analogous bis(oxazoline)-copper complexes, and are not compatible with the use of coordinating solvents in the method of preparation. The performance of the immobilized catalysts (up to 86 % ee)