Addition of chiral enolates to N-alkyl-3-acylpyridinium salts. Total synthesis of (+)-16-epivinoxine and (-)-vinoxine

1. Bennasar, M.-L.
2. Zulaica, E.
3. Alonso, Y.
4. Vidal, B.
5. Vázquez, J.T.
6. Bosch, J.