D. Sole et al., SYNTHESIS AND REACTIVITY OF A 3-VINYLIDENEPIPERIDINE AS A MODEL STUDYOF ALPHA-ALLENIC AMINES, Heterocycles, 43(11), 1996, pp. 2415-2424
4-Acetonyl-1-benzyl-3-vinylidenepiperidine (8), prepared by cyclizatio
n of propargylic silane (7), was used as a model to study the usefulne
ss of the allene moiety as a precursor of the two-carbon chain present
in the piperidine ring of Strychnos alkaloids.