Treatment of the dihydropyridine 5 with fluoride anion resulted in in situ formation of the allenyldiene 4 which cyclized to the azabicyclo[2.2.2]octene 9. Subsequent elaboration to the alcohol 24 and rearrangement gave norsecurinine 2. The intermediate diol 16 was converted into prenirurine 34 which upon conversion into an N-oxide rapidly rearranged to give traces of nirurine 1 and norphyllanthine