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Reagents and conditions: a) NaBH3CN, CH3OH, r.t., 71%; b) (Boc)2O, NaHCO3, THF, H2O, 85%; c) DBU, CH3CN, 0 °C to r.t., 50%; d) α-bromo peptides, DIPEA, DMF, r.t.; e) TFA: DODT: H2O: TIPS = 94: 2.5: 2.5: 1.
