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Synthesis 2007(15): 2337-2342
DOI: 10.1055/s-2007-983772
DOI: 10.1055/s-2007-983772
PAPER
© Georg Thieme Verlag Stuttgart · New York
Biomimetic Synthesis of Fused Bispyran: Lewis Acid Effects on Oxacyclizations of Polyepoxides
Further Information
Received
27 February 2007
Publication Date:
12 July 2007 (online)
Publication History
Publication Date:
12 July 2007 (online)
Abstract
The biomimetic synthesis of fused bispyran via Lewis acid mediated tandem oxacyclization of a 1,4,7-polyepoxide is explored. The nature of the Lewis acid promoter is critical for the endo-regioselectivity of epoxide cyclization, although anomalous apparent retention of stereochemistry is observed at some reactive centers.
Key words
biomimetic synthesis - fused polycyclic ethers - polyepoxides - regioselectivity - stereoselectivity
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