Organocatalyzed three-component Ugi and passerini reactions of 4-oxoazetidine-2-carbaldehydes and azetidine-2,3-diones. Application to the synthesis of γ-lactams and γ-lactones

1. Alcaide, B.
2. Almendros, P.
3. Aragoncillo, C.
4. Callejo, R.
5. Ruiz, M.P.