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An enantioselective synthesis of (−)-incarvilline is presented, employing a three-component coupling reaction and an intramolecular enone–olefin [2+2] photocycloaddition followed by a SmI 2 -induced cyclobutane ring-opening reaction.
The first total synthesis of dipiperamide A has been achieved by employing a solid-state photodimerization of an (E)-cinnamic acid derivative. This critical step results in the cyclobutane ring, which exists in the natural product, with full control of the regio- and stereochemistry at the four stereogenic centers. Results from these studies indicate that the proposed stereostructure of natural dipiperamide...
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