Abstract
Asymmetric intramolecular Diels-Alder (IMDA) reactions of optically active furfuryl fumarates result after crystallization in enantiopure 7-oxabicyclo[2.2.1]heptene derivatives that may be useful building blocks for natural product synthesis. The influence of high-pressure and thermal activation has been studied for these cycloadditions. The diastereoselectivities observed increase with the size of the tether substituents, but not linearly. A possible explanation based on transannular interactions is given.
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