The first synthetic studies on pestalotiopsin A. A stereocontrolled approach to the functionalised bicyclic coreElectronic supplementary information (ESI) available: crystal structure analysis of 18a. See http://www.rsc.org/suppdata/ob/b2/b209066j/
- 13 December 2002
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Organic & Biomolecular Chemistry
- Vol. 1 (2) , 328-337
- https://doi.org/10.1039/b209066j
Abstract
Pestalotiopsin A is a structurally unique, caryophyllene-type sesquiterpene which has shown immunosuppressive activity and cytotoxicity in preliminary assays. A stereocontrolled approach to the functionalised 2-oxabicyclo[3.2.0]heptane core of pestalotiopsin A is described. This constitutes the first synthetic studies on pestalotiopsin A. Our approach includes a samarium(II)-mediated 4-exo-trig cyclisation and a trans-lactonisation process triggered by the addition of alkylytterbium reagents to a cyclobutanone intermediate. Further manipulation provides access to advanced intermediates which are excellent precursors for the future construction of the final ring of the target.Keywords
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