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Reagents and conditions: (a)612 (1) NBS, CHCl3, 0 °C, 3 h, (2) Ni(cod)2, 1,5-cod, DMF, 80 °C, 3 h; (b)613 PPh3 (10 equiv), toluene, 120 °C, 3 h; (c)613 BAHA (4.0 equiv), DCM, rt, 1 h, then H2NNH2·H2O; (d)613 dppp (5 equiv), toluene, 120 °C, 1 h.
