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Reagents and conditions: (a)560 AuCl(PPh3) (10 mol %), AgSbF6 (10 mol %), 1,2-DCE, 80 °C, 24 h; (b) AuCl[P(C6F5)3] (10 mol %), AgOTf (10 mol %), 1,2-DCE, rt, 3 h; (c)518 Cs2CO3, CuI, DMF, microwave, 150 °C, 10 min; (d)517 AcCl (1.2 equiv), Et3N (2.0 equiv), DCM, rt, 4 h; (e) polyphosphoric acid, POCl3 (10 equiv) 120 °C, 3 h.
