Scheme 16.
Reagents and conditions: (i) TBDMSCl (3 eq.), imidazole (5.0 eq.), THF; (ii) TBAF (1 eq.), THF, 0 °C; (iii) trifuoromethanesulfonic anhydride (1.2 eq.), 2,6-dimethylpyridine (1 eq.), DCM, 0 °C.
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