The cycloaddition of monoalkylketenes to 2-oxoalkanoic ester-derived imines: a concise stereoselective approach to α,β-disubstituted asparates and 3,4-dialkylsubstituted β-lactams.

1. Palomo, C.
2. Aizpurua, J.M.
3. Galarza, R.
4. Iturburu, M.
5. Legido, M.