without changing your settings we'll assume you are happy to receive all RSC cookies.
You can change your cookie settings by navigating to our Privacy and Cookies page and following the instructions. These instructions
are also obtainable from the privacy link at the bottom of any RSC page.
The methyl ether derivatives 2, 4 and 6 of the mulberry Diels–Alder adducts chalcomoracin (1) and mulberrofuran C (3) and kuwanon J (5) respectively have been synthesized by a thermal [4 + 2]-cycloaddition reaction between a chalcone and dehydroprenyl diene. A H-bonded ortho OH substituent on the chalcone was found to be essential for Diels–Alder reactivity. Density functional theory calculations show that the OH group lowers the barrier for the Diels–Alder reaction by 2–3 kcal mol−1 compared with OMe. The acceleration by the OH group is traced to two transition-state effects: a stronger diene–chalcone interaction and better planarity of the aryl–diene unit.
Fetching data from CrossRef. This may take some time to load.
Organic & Biomolecular Chemistry
- Information Point