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Reagents and conditions: (a)514 EtOH, reflux, 1 h; (b) N2H4·H2O, EtOH, reflux, 8 h; (c)515 Cu(OTf)2 (100 mol %), MeCN, 80 °C, 12 h; (d) Cu(OTf)2 (10 mol %), Selectfluor (1.0 equiv), MeCN, 80 °C, 12 h; (e)517ortho-phenylenediamine (2.5 equiv), Na2CO3 (3 equiv), Cu(OAc)2 (0.1 equiv), i-PrOH/ethylene glycol (9:1), argon, reflux, 16 h; (f) TsOH·H2O (0.1 equiv), EtOH, reflux.
