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. Author manuscript; available in PMC: 2013 Oct 1.
Published in final edited form as: Angew Chem Int Ed Engl. 2012 Sep 7;51(40):10185–10189. doi: 10.1002/anie.201205601

Scheme 1.

Scheme 1

Reagents and conditions: a) AgOTf, p-TolSCl, MS 4Å, −78°C, then 11, TTBP, −78°C–0°C; b) (1) Mg(OMe)2, DCM, −20°C–0°C; (2) LevOH, EDC-HCl, DMAP, DCM; (3) DDQ, DCM/H2O; (4) HF/Pyridine; (5) TBDPSCl, imidazole, DCM; c) AgOTf, p-TolSCl, MS 4Å, −78°C, then 13, TTBP, −78°C–0°C; d) AgOTf, p-TolSCl, MS 4Å, −78°C, then 16, TTBP, −78°C–0°C; e) (1) DDQ, DCM/H2O; (2) HF/Pyridine; (3) TBDPSCl, imidazole, DCM.