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Reagents and conditions: (a) (1) ClCO2i-Bu, NMM, THF, −25 °C and (2) H2NCH2CN × H2SO4, NaOH, H2O, THF, −25 °C to rt, 2 h; (b) TFA, CH2Cl2, rt, 2 h; (c) benzyl isocyanate, Et3N, CH2Cl2, 0 °C for 15 min to rt for 16 h.
