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Reagents and conditions: (a) CH3(NH)NH2, EtOH 96%, r.t., 2 h; (b) HCOONH4, Pd/C, EtOH 96%, reflux, 2h; (c) HBr 48%, sealed/pressure vessel, 130 °C, 3 h; (d) (i) anhydrous THF, CH3COONa, 0 °C then triphosgene, reflux, 2 h; (ii) 33% NH4OH, 0 °C, 1 h.
