Scheme 9.
Reagents and conditions: (i) DAST, CH2Cl2, −78 °C, 23%; (ii) TESCl, DMAP, CH2Cl2; (iii) BzCl, pyridine, DIPEA, 70 °C; (iv) TBAF, THF, 0 °C, 81% over three steps and (v) DAST, CH2Cl2, −78 °C, 45%.
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