Unexpected metal base-dependent inversion of the enantioselectivity in the asymmetric synthesis of α-amino acids using phase-transfer catalysts derived from cinchonidine

1. Mazón, P.
2. Chinchilla, R.
3. Nájera, C.
4. Guillena, G.
5. Kreiter, R.
6. Klein Gebbink, R.J.M.
7. Van Koten, G.