1. For reviews on the piperidine alkaloids, see:
2. Recent Progress in the Synthesis of Piperidine and Indolizidine Alkaloids;Angle,1995
3. Pyridine and Piperidine Alkaloids: An Update;Schneider,1996
4. New Approaches to the Syntheses of Piperidine, Pyrrolizidine, and Quinazoline Alkaloids by Means of Transition Metal Catalyzed Carbonylations;Ojima,1999
5. Indolizidine and quinolizidine alkaloids