I. Moldvai et al., Chemistry of indoles carrying a basic function. Part 5. Some observations while constructing an ergoline ring by Stobbe reaction, J CHEM R-S, (12), 1999, pp. 687-687A
Tricyclic indole derivative 11 affords the imide 12 tinder Stobbe reaction
conditions rather than the expected intermediate containing an ergoline rin
g.