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Reagents and conditions: (a) H2SO4, t-BuOH, DCM, rt; (b) LiOH, THF, H2O, rt; (c) (i) DPPA, TEA, DCE, reflux; (ii) 9-fluorenemethanol, titanium (IV) tert-butoxide, benzene, rt; (b) TFA, DCM, 0 °C.
