Scheme 3.
Reagents and conditions: (a) aniline, (PhO)2P(O)H, rt, 4 h; (b) (i) quinoxaline-6-carbaldehyde, Cs2CO3, rt, 16 h; (ii) 1 N HCl, 1 h; (c) (i) DMF•DMA, 80 °C, 2 h; (ii) N2H4•H2O, EtOH, reflux, 4 h; (d) NaI (cat.), NaH, rt, 2 h.
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