Electrophile-induced cyclisation–fragmentation reactions of oxime O-allyl and O-benzyl ethers

Abstract
Phenylselenyl bromide-induced cyclisation of γ- and δ-unsaturated aldoxime and ketoxime O-allyl and O-benzyl ethers is followed by a slow fragmentation furnishing cyclic imines which are readily reduced to pyrrolidines, piperidines or tetrahydroisoquinolines by sodium borohydride; dialkenyl oximes yield quinolizidines by an analogous sequence terminating in a mercury(II)-induced cyclisation.

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