New bis(oxazoline) ligands with secondary binding sites for the asymmetric cyclopropanation of furans
The diastereo- and enantioselective cyclopropanation of furans was achieved in up to 91% ee using a new set of chiral bis(oxazoline) ligands that are able to use secondary binding sites to enhance selectivity. In contrast, with substrates such as styrene
Schinnerl, Marina,Boehm, Claudius,Seitz, Michael,Reiser, Oliver
A New CopperII/Isopropylidene-2,2-bis(oxazoline) catalyst and Its stable reactive complex with acryloyloxazolidinone in enantioselective reactions
A real ghost: The [TIPS-box/Cu-(OTf)2] complex (box = isopropylidene-2,2-bis(oxazoline)) is a catalyst of the Diels-Alder and the 1,3-dipolar cycloaddition between acryloyl-1,3-oxazolidin-2-one with cyclopentadiene and diphenylnitrone with ee v
New applications of bis(oxazoline) ligands in catalysis: Asymmetric 1,2-and 1,4-addition of ZnR2 to carbonyl compounds
(Matrix Presented) The enantioselective addition of ZnR2 to aldehydes (1,2) and cyclic enones (1,4) was accomplished using bis(oxazolines) as chiral ligands. The requirement for hydroxymethylene side chains in the ligands strongly suggests that bimetallic catalysts are decisive for high enantiocontrol in these additions.
Schinnerl, Marina,Seitz, Michael,Kaiser, Anja,Reiser, Oliver
p. 4259 - 4262
(2007/10/03)
Bifunctional catalysts for catalytic asymmetric sulfur ylide epoxidation of carbonyl compounds
Carbonyl epoxidation using diazo compounds mediated by catalytic quantities of sulfide and metal catalyst has been investigated using sulfides linked to the metal catalyst. In this study a range of bisoxazolines with pendant sulfides were tested in the as
Aggarwal, Varinder K.,Bell, Louise,Coogan, Michael P.,Jubault, Philippe
p. 2037 - 2042
(2007/10/03)
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