The deprotonation of α-monosubstituted selenoamides with LDA followed by allylation
gives γ,δ-unsaturated selenoamides in good to high yields. In the initial step, allylation
may take place at the selenium atom of lithium eneselenolates to form allylic vinyl
selenides, which then undergo seleno-Claisen rearrangement. As allylic bromides, γ,γ-disubstituted
compounds such as geranyl and neryl bromides could also be used to give products that
incorporated tertiary-quaternary stereogenicity with high efficiency.
Key words
seleno-Claisen rearrangement - γ,δ-unsaturated selenoamides - tertiary-quaternary
stereogenicity - high stereoselectivity