Pure Appl. Chem., 1997, Vol. 69, No. 3, pp. 531-536
doi:10.1351/pac199769030531
Cycloaddition reactions for the synthesis of piperidine and indolizidine alkaloids
A. B. Holmes, B. Bourdin, I. Collins, E. C. Davison, A. J. Rudge, T. C. Stork and J. A. Warner