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(a) (CH3)3CCOCl, pyridine, rt, overnight, 97%; (b) Et4N+F−, THF, rt, 3 h, 91%; (c) TrCl, DMAP, Pyridine, 45 °C, 3 h, 85%; (d) (i) CS2, NaH, MeI, DMF, 0 °C–rt, 30 min (ii) Bu3SnH, AIBN, rt, 3 h, overall yield 83%; (e) 5% TFA/CHCl3, −20 °C, 4 h, 83%.
