The addition of acetone to rac-2-methylsulfinyl-benzaldehyde, catalyzed by secondary amines (morpholine, piperidine, L-proline, L-prolinamide and (S)-(-)-alpha,alpha-diphenyl-2-pyrrolidinemethanol trimethylsilyl ether), was realized. Interesting aspects, such as 1,4-asymmetric induction by the remote sulfinyl group of the aldehyde but also the stereochemical control and kinetic resolution of the racemic substrate by the chiral organocatalyst were examined. Finally, an unexpected stereoselective retro-aldol reaction catalyzed by L-proline was pointed out. (C) 2016 Elsevier Ltd. All rights reserved.
Influence of a remote sulfinyl group on L-proline-catalyzed direct asymmetric aldol addition of acetone
Villano Rosaria;
2016
Abstract
The addition of acetone to rac-2-methylsulfinyl-benzaldehyde, catalyzed by secondary amines (morpholine, piperidine, L-proline, L-prolinamide and (S)-(-)-alpha,alpha-diphenyl-2-pyrrolidinemethanol trimethylsilyl ether), was realized. Interesting aspects, such as 1,4-asymmetric induction by the remote sulfinyl group of the aldehyde but also the stereochemical control and kinetic resolution of the racemic substrate by the chiral organocatalyst were examined. Finally, an unexpected stereoselective retro-aldol reaction catalyzed by L-proline was pointed out. (C) 2016 Elsevier Ltd. All rights reserved.File in questo prodotto:
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