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Reagents and conditions: (a) Bis[6-trifluoromethyl)benzotriazol-1-yl)]methylphosphonate, pyridine, then BnOH, deprotect using palladium black, H2, H2O, NaHCO3; (b) SO3, pyr.; then tert-butanol, H2O, NaHCO3; (c) RuCl3.H2O, CCl4, NaIO4, MeCN, H2O; deprotection for (b) and (c) as for (a).
