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The synthesis of (11R,12S)-lactobacillic acid and its enantiomer

Coxon, G.D. and Al Dulayymi, J.R. and Baird, M.S. and Knobl, S. and Roberts, E. and Minnikin, D.E. (2003) The synthesis of (11R,12S)-lactobacillic acid and its enantiomer. Tetrahedron: Asymmetry, 14 (9). pp. 1211-1222. ISSN 1362-511X

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Abstract

(11R,12S)-Lactobacillic acid has been prepared from 2,3-O-isopropylidene-d-glyceraldehyde, in a sequence involving asymmetric cyclopropanation, and from cis-cyclopropane-1,2-dimethanol, using enzymatic desymmetrisation. The key step in the former route was the stereochemically controlled cyclopropanation of (1Z,4′S)-(2′,2′-dimethyl-1′,3′-dioxolan-4′-yl)-1-octene via a Simmons–Smith type reaction, using diethylzinc and chloroiodomethane. This product was converted into the key intermediate (1R,2S)-1-formyl-2-hexylcyclopropane, which was also obtained by a known sequence from the (1R,2S)-monobutyrate ester of cis-cyclopropane-1,2-dimethanol. This pivotal aldehyde was converted into (11R,12S)-lactobacillic acid. Using analogous chemistry, the (11S,12R)-enantiomer of lactobacillic acid was prepared from 2,3-O-isopropylidene-d-glyceraldehyde or from the (1S,R)-monobutyrate ester of cis-cyclopropane-1,2-dimethanol.

Item type: Article
ID code: 37921
Keywords: lactobacillic acid , enantiomer , dimethanol, Pharmacy and materia medica, Organic Chemistry, Catalysis, Physical and Theoretical Chemistry, Inorganic Chemistry
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 27 Feb 2012 14:15
    Last modified: 04 Sep 2014 19:15
    URI: http://strathprints.strath.ac.uk/id/eprint/37921

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