Scheme 3a.
aReagents: (a) (Cli-Pr2Si)2O, 2,6-lutidine, 28%; (b) i-Bu2AlH, pyr, DMAP, Ac2O, 88%; (c) t-BuMe2SiCl, imidazole, 75%; (d) i-Bu2AlH, pyr, DMAP, Ac2O, 93%.
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