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Reagents and conditions: (a) TBSCl, imidazole, DMF, room temperature, 12 h, 65%; (b) NaH, BnBr, DMF, room temperature, 1 h, 94%; (c) cat. p-TSA, CH3OH, room temperature, 91%; (d) NaH, imidazole, CS2, THF then CH3I, room temperature, 87%; (e) tri-n-butyl tin hydride, AIBN, toluene, reflux, 3 h, 45 %; (f) Triethylortho acetate, p-TSA, DMF, room temperature, 90%; (g) NIS, TfOH, CH2Cl2:Et2O (1:3), −20 oC, 0.5 h, 65%.
