C. Dumas et al., Partial synthesis of camptothecin analogues, 2 Oxidation of the CDE rings of pentacyclic quinoline compounds derived from tetrahydroalstonine, EUR J ORG C, (21), 2000, pp. 3601-3606
New polycyclic 8,9-dihydro-7H-indolizino[1,2-b]quinolin-11-ones have been s
ynthesized from tetrahydroalstonine (2) through sequential oxidation reacti
ons.