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DOI: 10.1055/s-2002-33531
First Practical Asymmetric
Synthesis of a New Tetrasubstituted
Tetrahydrofuran, (-)-Goniothalesdiol
Publication History
Publication Date:
17 September 2002 (online)
Abstract
An efficient and practical strategy has been developed for the construction of the antipode of 3,4-dihydroxy-2,5-disubstituted tetrahydrofuran, goniothalesdiol, isolated from the bark of the Malaysian tree. The synthetic process is based on the convenient manipulation via Lewis acid-induced deoxygenation of the highly functionalized lactone derived from d-glucuronolactone.
Key words
goniothalesdiol - tetrasubstituted tetrahydrofuran - stereoselective deoxygenation - trisubstituted γ-lactone - d-glucuronolactone
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References
The absolute S-configuration of the new asymmetric center in 5a was proved by the transformation into the meso compound 12 through sequential seven steps as shown below (Figure [2] ).
15Coupling reaction of this diol intermediate 13 with Horner-Emmons reagent interestingly brought about the tricyclic compound 15 directly in 75% isolated yield as a sole product. It is reasonable to assume that the formation of 15 would be resulted in the reaction through intramolecular Michael addition followed by cyclization of α,β-unsaturated ester 14 (Figure [3] ).
16Hydrogenation and simultaneous removal of the benzyl groups in 9 with Pd on carbon (10%) under H2 atmosphere were proved to give a complex mixture. In addition, the hydrogenated final enantiomer of 1 was unstable and decomposed on standing.