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|Title: ||Catalytic Asymmetric Hydrogenation: Toward Chiral Diamines and Cyclohexanes|
|Authors: ||Pignatelli, Joseph|
|Advisor: ||Dong, Vy Maria|
|Issue Date: ||19-Dec-2011|
|Abstract: ||As the need for developing environmentally friendly chemistry continues to become more apparent, catalytic asymmetric hydrogenation has risen to the forefront as a reliable and eco-friendly method for enantioselective synthesis. We herein describe our progress toward the synthesis of valuable structural motifs via hydrogenation: chiral 1,2-diamines, 1,3-diamines and substituted cyclohexanes.
We propose a strategy whereby protected 1,2-diimine and 1,3-diimine surrogates can be hydrogenated selectively and deprotected to furnish the desired chiral amines. Using this strategy, it was demonstrated that imidazolone precursors could be hydrogenated with >20:1 diastereoselectivity to give latent 1,2-diamines, albeit with no enantiomeric excess.
We further propose that substituted benzene rings linked to an oxazolidinone
chiral-auxiliary can be diastereoselectively hydrogenated using a heterogeneous metal catalyst. Following hydrogenation, the chiral cyclohexanes could be obtained in up to quantitative yield and 99% diastereomeric excess.|
|Appears in Collections:||Master|
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