Preparation of Imino Lactones by Electrophilic Cyclization of beta,gamma-Unsaturated Hydroxamates: Formation of 3-Cyanoprop-2-en-1-ones through Fragmentation Reactions

[摘要]：Treatment of gamma-disubstituted beta,gamma-unsaturated hydroxamates with bis(collidine)bromine(I) hexafluorophosphate led mainly to the formation of cyclic bromo imidates - the thermodynamic products. Unsaturated cyclic imidates were then obtained by treatment with triethylamine. With gamma-aryl beta,gamma-unsaturated hydroxamates, the corresponding cyclic bromo imidates were also obtained. On treatment with triethylamine, however, these compounds led to the formation of 3-cyanoprop-2-en-1-ones in good yields through fragmentation reactions.

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