Journal or Book Title
The Journal of Organic Chemistry
An intermediate containing the ACE ring system of quassimarin was prepared. The isopropylidene malonate 8 reacted with diene 2 to afford two Diels-Alder adducts. The major adduct was converted into lactone 11 by a sequence involving epoxidation followed by acid-mediated epoxide opening and lactonization.
American Chemical Society
Kraus, George A. and Krolski, Michael E., "Synthesis of a precursor to quassimarin" (1986). Chemistry Publications. 721.