A stereoselective synthesis of pentacyclic dilactam 1, a known precursor of
the indole alkaloid akagerine, involving addition of the enolate of 1-acet
ylindole 2 to 3-acetyl-2-fluoropyridinium salt 3, cyclization of the result
ant IP-dihydropyridine, elaboration of the (E)-ethylidene substituent and c
losure of the C ring by Pummerer reaction, is reported.