Cycloaddition reactions of oximes; powerful new carbon–carbon bond forming methodology
作者:Paul Armstrong、Ronald Grigg、William J. Warnock
DOI:10.1039/c39870001325
日期:——
Oximes react with Michael acceptors and dipolarophiles, usually regio- and stereo-specifically, via a tandem Michael addition–1,3-dipolar cycloaddition process, to give isoxazolidines in good yield; analysis of the tandem process identifies four broad synthetic variants, and examples of those involving initial intermolecular Michael addition are given.
Stereoselective electrophile-induced mono- and bis-cyclisation–fragmentation reactions of alkenyl oxime O-allyl and O-benzyl ethers. Synthesis of dihydropinidine
作者:H Ali Dondas、Ronald Grigg、Jasothara Markandu、Trevor Perrior、Tekka Suzuki、Sylvie Thibault、W Anthony Thomas、Mark Thornton-Pett
DOI:10.1016/s0040-4020(01)01118-8
日期:2002.1
Phenylseleny bromide-induced cyclisation of γ- and δ-unsaturated aldoxime and ketoxime O-allyl and O-benzyl ethers is followed by a slow fragmentation of the resultant oxyiminium ions furnishing cyclic iminium salts which are readily reduced to pyrrolidines, piperidines or tetrahydroisoquinolines by sodium borohydride; dialkenyl oximes yield indolizidines and quinolizidines by an analogous sequence