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Reagents and Conditions. a) Dess-Martin periodinane, an. CH2Cl2, 72%; b) Tetraisopropyl methylenediphosphonate, NaH, an. THF, 48%; c) TBAF, THF, 88%; d) Triphenylphosphine, 6-chloropurine, diisopropyl azodicarboxylate, an. THF, 85%; e) 2 M NH3 in i-PrOH, 70 °C, 85%; f) Iodotrimethylsilane, an. CH2Cl2, 78%.
