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Reagents and conditions: (a) NH2NH4·H2O, sealed/pressure vessel, 180 °C, 12 h; (b) CH3I, K2CO3, anhydrous DMF, 80 °C, 2–4 h; (c) (i) anhydrous THF, CH3COONa, 0 °C then triphosgene, reflux, 2 h; (ii) NH4OH 33%, 0 °C, 1 h; (d) ClCOCH3, anhydrous THF, 0 °C, then r.t., 20 min.
