A Synthetic Approach to Quassin. Introduction of Functionality and Stereochemistry by a Diels–Alder Reaction

Abstract
Using a Lewis acid catalyzed Diels–Alder reaction as the key step, the crystalline synthetic intermediate (17) has been prepared. Compound 17 contains all C-atoms of quassin (1) and stereochemistry and 0-functionality suitable for the conversion into 1.

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