50995-59-0Relevant articles and documents
Synthetic transformations of higher terpenoids: V. 2-Methyl-4,5-dioxo-3-ethoxycarbonyl-4,5-dihydroindole, a new dienophile. Synthesis of indoloterpenes from levopimaric acid
Chernov,Shults,Shakirov,Gatilov,Bagryanskaya,Tolstikov
, p. 1623 - 1633 (2007/10/03)
2-Methyl-4,5-dioxo-3-ethoxycarbonyl-4,5-dihydroindol is an active dienophile that via [4+2]-cycloaddition to the levopimaric acid and to the cyclopentadiene affords indole alkaloids of new structural types.