Issue 8, 2014

Stereocontrolled synthesis of propionate motifs from l-lactic and l-alanine aldehydes. A DFT study of the hydrogen transfer under endocyclic control

Abstract

Reported herein is the synthesis of all possible stereotriad propionates derived from L-lactic acid and L-alanine. The approach is based on a stereocontrolled Mukaiyama aldol reaction followed by a free radical-mediated hydrogen transfer, for which the choice of Lewis acid (monodentate or bidentate) dictates the stereochemical outcome in each reaction. The sequential process has been applied iteratively for the synthesis of eight stereopentad motifs derived from β,γ-alkoxyaldehydes. New experimental data and DFT calculations (BHandHLYP/TZVP) of the transition states involved in the radical reduction of aluminate intermediates support the proposed model of the endocyclic effect leading to high 2,3-syn selectivities for the synthesis of propionates and subunits thereof.

Graphical abstract: Stereocontrolled synthesis of propionate motifs from l-lactic and l-alanine aldehydes. A DFT study of the hydrogen transfer under endocyclic control

Supplementary files

Article information

Article type
Research Article
Submitted
15 mai 2014
Accepted
17 jul 2014
First published
22 jul 2014

Org. Chem. Front., 2014,1, 974-982

Stereocontrolled synthesis of propionate motifs from L-lactic and L-alanine aldehydes. A DFT study of the hydrogen transfer under endocyclic control

F. Godin, M. Duplessis, C. Buonomano, T. Trinh, K. Houde, D. Chapdelaine, J. Rodrigue, A. Boutros and Y. Guindon, Org. Chem. Front., 2014, 1, 974 DOI: 10.1039/C4QO00142G

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