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Reagents: (i) pTsOH, H3CC(OMe)2CH3, acetone, 100%; (ii) (a) (tBuO)2PN(iPr)2, 5-Ph-1H-tetrazole, DCM; (b) H2O2, Et3N, 80%; (iii) TBAF·3H2O, AcOH, 100%; (iv) PSS, TPS-Cl, 5-Ph-1H-tetrazole, pyridine, 100%; (v) 50% TFA (aq), 100%; (vi) 0.1 M NaOH–dioxane.
