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Letters in Organic Chemistry

Editor-in-Chief

ISSN (Print): 1570-1786
ISSN (Online): 1875-6255

Enantiodivergent Chemoenzymatic Synthesis of (S)- and (R)-(Z)-9-Dodecyl-4,5,8,9-tetrahydro-3H-oxonin-2-one as Analogues of Topsentolides

Author(s): Isolde Wetzel, Jurgen Krauss and Franz Bracher

Volume 9, Issue 3, 2012

Page: [169 - 174] Pages: 6

DOI: 10.2174/157017812800167466

Price: $65

Abstract

(Z)-4,5,8,9-Tetrahydro-3H-oxonin-2-one is the core of naturally occurring topsentolides, cytotoxic oxylipins isolated from a marine sponge of the genus Topsentia. An enantiodivergent approach to topsentolide analogues was worked out with a lipase-catalyzed kinetic resolution of a secondary alcohol and a ring-closing metathesis giving the unsaturated nine-membered lactone as key steps.

Keywords: Cytotoxic activity, Grubbs catalyst, kinetic enzymatic resolution, lipase, ring closing metathesis, topsentolides, olefin, metathesis, Friedel-Crafts acylation, marine sponge


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