Enantioselective synthesis
of
diastereomers. (a) MeI, NaHCO3, DMF. (b) DIBAL, MeOH. (c)
NaHSO3, KCN. (d) TBSCl, imidazole, DMF. (e) H2, 5% Rh/C, EtOH/NH3. (f) Benzaldehyde, NaCNBH3, MeOH. (g) AcCl, Et3N, CH2Cl2.
(h) HCl, dioxane. (i) Cbz-Cl, Et3N, CH2Cl2. (j) HF/pyridine, acetonitrile.