Asymmetric synthesis of α-keto β-lactams via [2+2] cycloaddition reaction: A concise approach to optically active (α-hydroxy β-lactams and β-alkyl(aryl)isoserines.

1. Palomo, C.
2. Aizpurua, J.M.
3. Miranda, J.I.
4. Mielgo, A.
5. Odriozola, J.M.