Synthetic studies on quassinoids: total synthesis of (-)-chaparrinone, (-)-glaucarubolone, and (+)-glaucarubinone
作者:Paul A. Grieco、Jon L. Collins、Eric D. Moher、Thomas J. Fleck、Raymond S. Gross
DOI:10.1021/ja00067a025
日期:1993.7
The total synthesis of (-)-chaparrinone (3), (-)-glaucarubolone (4), and (+)-glaucarubinone (3) is described. The synthesis features an intermolecular Diels-Alder reaction between dienophile 6 and (E)-4-methyl-3,5-hexadienoic acid (17) in 5.0 M lithium perchlorate-ethyl acetate. Diels-Alder adduct 16 is converted via a two-step process into tetracyclic lactone 10. Inversion of configuration at C(9)