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Reagents and conditions: (i) P2S5, 1,2-ethylenediamine, sealed tube, 120 °C, 2 h; (ii) K2CO3, CH3CN, 80 °C; (iii) N2H4·H2O, EtOH, 80 °C; (iv) EDC·HCl, DMAP, CH3CN, CH2Cl2, 80 °C; (v) H2, MeOH, Pd–C 5%; (vi) HgCl2, Et3N, DMF, 0 °C to rt; (vii) CH2Cl2, TFA, 0 °C.
