Non-reducing to reducing synthesis using a fluorous silyl protecting group.75 Reagents and conditions (a) FeCl3, DCM/H2O, rt, 91.1%; (b) C8F17CH2CH2(i-Pr)2SiH, TfOH, Ar, 0 °C; then 219 2,6-lutidine, DCM, rt, 98.9%; (c) NBS, TMSOTf, DCM/H2O, 0 °C → rt; (d) CCl3CN, DBU, DCM, rt; (e) TMSOTf, MS 4 Å, DCM, Ar, −40 °C; (f) NaOMe, MeOH/DCM, rt, 93.6%; (g) Aq. HCl (0.02 M), MeOH, rt.