OEt 2 AcO O OAc AcO AcO AcO OBn O O O HO OMe O OBn O O BnO BnO OBn 1) MeOH, Et3N, H2O 2) BnBr, NaH, DMF 3) TBAF, THF 61% OBn BnO BnO O OBn BnO BnO BnO BnO O ...
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