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Reaction conditions: a) LiCl, DMF, 50 °C; b) BzCl, pyridine, 0–25 °C; c) TBAF, THF; d) aq. NH3, THF; e) DMTrCl, pyridine; f) PivCl, H3PO3, pyridine, 0–30 °C; g) Cl2HCCO2H, H2O, DCM. Bz = benzoate; DMTr = 4,4- Dimethoxytrityl; Tf = trifluoromethansulfonate; TBS = tert-Butyldimethylsilyl.
