21 15d 80 TBDPSCl imidazole, DMF, rt. 12 15e 76 CO2MeOH2MeO TMSCl NEt3, THF, rt. 6 16a 56 TESCl imidazole, DMF, rt. 12 16b 66 TIPSOTf 2,6-lutidine, CH2Cl2, ...
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