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Reagents and conditions: (a) K2CO3, Cbz-Cl, THF/H2O, 0 °C to rt; (b) n-BuLi, (R)-glycidyl butyrate, THF, −78 °C to rt; (c) NIS, TFA, rt; (d) (Bu)3Sn–Sn(Bu)3, Pd(PPh3)2Cl2, dioxane, 100 °C.20
