Diastereoselective intramolecular alder-ene reaction on chiral perhydro-1,3-benzoxazines. A rapid entry to enantiopure cis-3,4-disubstituted pyrrolidines

1. Pedrosa, R.
2. Andrés, C.
3. Martín, L.
4. Nieto, J.
5. Rosón, C.