Stereoselective formal [3 + 2] cycloaddition of N-alkylidene glycine ester anions to chiral fischer alkenylcarbene complexes. Asymmetric synthesis of 3,4,5-trisubstituted prolines

1. Merino, I.
2. Santosh Laxmi, Y.R.
3. Flórez, J.
4. Barluenga, J.
5. Ezquerra, J.
6. Pedregal, C.