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Reagents and conditions: (a) NaOH, allyl bromide, dioxane, rt, overnight; (b) MsCl, TEA, DCM, rt, 3 h; (c) VHL ligands 2b–d, K2CO3, DMF, 70 °C, overnight; (d) OsO4, NaIO4, pyridine, dioxane/H2O, rt; (e) 1c, NaBH(OAc)3, TEA, DMF, rt, overnight.
