Abstract
AbstractA synthesis of the antitumor alkaloids ellipticine 1 and olivacine 2 is reported. The route involves a thermal electrocyclic reaction of conjugated hexatriene system 4 derived from 2‐alkenylindole derivatives 5. Heating of the 2‐alkenylindole derivative 5b at 450–460° gave ellipticine 1 (30%) and 11‐demethylellipticine 14 (43%). In a similar manner, the thermolysis of the 2‐alkenylindole 5c afforded olivacine 2 (57%).
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