Jr. Hanrahan et al., On the characteristics of reverse-cope cyclizations of homoallylic sulfoxide nitrone adducts: A highly stereoselective route to pyrrolidine-N-oxides, SYNLETT, (10), 2001, pp. 1587-1589
Lithiated homoallylic sulfoxides 4 add smoothly to a selection of aldonitro
nes to give largely single diastereoisomers of the unsaturated hydroxylamin
es 5 which undergo reverse Cope cyclizations to give the highly substituted
pyrrolidine-N-oxides 6 in a stereocontrolled manner.