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Reagents and conditions: (a) (CH3CO)2O, 110 °C, 5 h; (b) 28.0 – 30 % NH3 (aq), 50–60 °C, 10 h, 70% (two steps); (c) PheCHO, NaOAc, HOAc, 110 °C, 30 h; (d) POCl3, N,N-dimethylaniline, toluene, 110 °C, 8 h; (e) 2-amino-5-diethylaminopentane, DMAP, Et3N, toluene, 110 °C, 15 h.
