Organocatalyzed route to enantioenriched pipecolic esters: decarboxylation of an aminomalonate hemiester |
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Authors: | Thomas Seitz Henri Bekolo Jean-Christophe Plaquevent Jacques Rouden |
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Institution: | a Laboratoire de Chimie Moléculaire et Thio-organique, UMR CNRS 6507—ENSICAEN, Université de Caen-Basse Normandie, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France b IRCOF, UMR CNRS 6014—Université de Rouen, Faculté des Sciences, Rue Tesnière, 76821 Mont Saint Aignan Cedex, France |
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Abstract: | Enantioenriched pipecolic esters were prepared in good yields in the decarboxylation, at room temperature, of N-protected piperidinohemimalonates catalyzed by cinchona alkaloids. Enantiomeric excesses as high as 72% were obtained when using 9-epi-cinchonine and the N-benzoyl substituted piperidinohemimalonate. A detailed study of the different reaction parameters revealed that the selectivity of this noncovalent organocatalyzed reaction is strongly dependent on the solvent, toluene or carbon tetrachloride being the best ones. The whole process based on the malonic acid synthesis was successfully tested on a 10 mmolar scale and established a practical alternative to the asymmetric protonation of lithium enolates. |
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Keywords: | Organocatalysis Enantioselective decarboxylation Pipecolate Cinchona alkaloids |
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