Synthesis 2002(14): 1973-1978
DOI: 10.1055/s-2002-34377
PAPER
© Georg Thieme Verlag Stuttgart · New York

Highly Diastereoselective Ketone Aldol Reactions of Butane-2,3-diacetal Desymmetrised­ Glycolic Acid

Darren J. Dixona, Antonio Guarnab, Steven V. Ley*a, Alessandra Polaraa, Félix Rodrígueza
a Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
Fax: +44(1223)336442; e-Mail: svl1000@cam.ac.uk;
b Dipartimento di Chimica Organica ‘Ugo Schiff’, Università degli Studi di Firenze, Polo Scientifico, Via della Lastruccia, 13, 50019 Sesto Fiorentino, Italy
Weitere Informationen

Publikationsverlauf

Received 13 June 2002
Publikationsdatum:
26. September 2002 (online)

Abstract

Butane-2,3-diacetal (BDA) desymmetrised glycolic acid building block 1 undergoes highly diastereoselective lithium enolate ketone aldol reactions with a range of methyl and mono-substituted methyl ketones to yield, after acid-catalysed deprotection, enantiopure α,β-dihydroxy acid derivatives bearing a quaternary carbon atom at the β-hydroxy centre.