Cyclocondensation of (±)-exo,exo-5,6-(Isopropylidenedioxy)-3-(pyrrolidinomethylene)bicyclo[2.2.1]heptan-2-one with N-C-N Dinucleophiles - Pérez-Castro, Isabel; Caamaño, Olga; García, Marcos D; Fernández, Franco; López, Carmen (Synthesis, 2007)