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Reagents and conditions: (i) n-PrNH2, EtOAc; (ii) 10% Pd/C, EtOH; (iii) compound c, EDC, HOBT, Et3N, CH2Cl2; (iv) TFA, CH2Cl2; (v) 10% Pd/C, MeOH; (vi) CH2=CHCOCl, DIEA, THF; (vii) 1M TiCl4, CH2Cl2; (viii) compound f, EDC, HOBT, Et3N; (ix) NaHSO3, EtOH/H2O; (x) dioxane, 80 °C.
