Formation of orthoesters in the sharpless asymmetric epoxidation : hemisynthesis of labdanes

1. Urones, J.G.
2. Marcos, I.S.
3. Basabe, P.
4. J. Sexmero, M.
5. Diez, D.
6. Garrido, N.M.
7. Prieto, J.E.S.