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Título : First asymmetric synthesis of an acyclic β,β-dialkylated-γ-aminobutyric acid
Autor : Aguirre, Daniel, Cativiela, Carlos, Díaz-de-Villegas, María D., Gálvez, José A.
Palabras clave : γ-Amino acids
Asymmetric synthesis
Diastereoselective alkylation
Fecha de publicación : 21-Aug-2006
Editor: Elsevier
Resumen: Enantiomerically pure (R)-γ-amino-β-benzyl-β-methylbutyric acid, an acyclic β,β-dialkyl GABA derivative, is efficiently synthesised from (1S,2R,4R)-10-dicyclohexylsulfamoylisobornyl 2-cyanopropanoate by a sequence based on benzylation, Arndt–Eistert homologation and nitrile reduction. Benzylation of (1S,2R,4R)-10-dicyclohexylsulfamoylisobornyl 2-cyanopropanoate using potassium carbonate under not strictly anhydrous conditions occurs diastereoselectively to afford (1S,2R,4R)-10-dicyclohexylsulfamoylisobornyl (S)-2-cyano-2-methyl-3-phenylpropanoate, the key chiral intermediate from which the desired γ-amino acid is obtained in five steps in 65% overall yield.
Descripción : 5 pages, 2 schemes, 1 figure.
Versión del editor:
ISSN: 0040-4020
DOI: 10.1016/j.tet.2006.06.021
Citación : Tetrahedron 62(34): 8142-8146 (2006)
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