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. Author manuscript; available in PMC: 2015 May 19.
Published in final edited form as: Angew Chem Int Ed Engl. 2014 Apr 25;53(21):5248–5260. doi: 10.1002/anie.201309494

Scheme 19.

Scheme 19

Completion of Presilphiperfolan-1β-ol (3) and Synthesis of Isomer 4. HMDS = hexamethyldisilazane, TMSCl = chlorotrimethylsilane, TBAF = tetrabutylammonium fluoride.