Scheme 3.
Reagents and conditions: (a) tert-butyldiphenylsilyl chloride (TBDPSCl), imidazole, DMF or TBDPSCl, DMAP, pyridine; (b) MsCl, pyridine; (c) 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), PhMe or DMF, Δ; (d) TBAF, THF.
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