Revised structures for fumaritridine and fumaritrine: Two indenobenzazepine type alkaloids

Fumaritridine and fumaritrine are not spirobenzylisoquinolines. Rather, they are indenobenzazepines so that fumaritridine is represented by expression $\text{10}$ and fumaritrine by $\text{11}$. Treatment of dihydroparfumine ($\text{6}$) and dihydroparfumidine ($\text{7}$) uith trifluoroacetic anhydride folloued by quenching with methanol gives $\text{10}$ and $\text{11}$, respectively.