sodium dithionite; sodium hydrogencarbonate in dimethyl sulfoxide T=75°C; 6 h;

2,4-di(tert-butyl)-4-methylpyridine in dichloromethane 0.5 h; Ambient temperature;

PdCl2(PPh)2; triphenylphosphine; zinc(II) chloride 1.) N-methylpyrrolidone, r. t., 2 h, 2.) 140 deg C, 2 h; Yield given. Multistep reaction. Yields of byproduct given;