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(a) MsCl, 0.15 equiv, NEt3, dioxanne, 0 °C. (b) BnONH2, 2 equiv, MeOH, 65 °C. (c) ClCOCH2OAc, MeOH, NET3, 0 °C. (d) MeOH/NET3/H2O, room temperature. (e) Pd (Lindlar) 10%, EtOH, room temperature. (f) mCPBA, 2 equiv, CH2Cl2, solid Na2HPO4, 0 °C. (g) P(OBn)2N(iPr)2, 4 equiv, imidazole, triazole, AcCN, room temperature, and then tBuOOH. (h) H2/Pd/C, MeOH, NET3, 2 equiv. (h) H2O.
