1: 75 percent / K2CO3 / dimethylformamide / 1.5 h / 100 - 110 °C 2: 63 percent / Fe powder; HOAc / propan-2-ol / 1.5 h / Heating 3: pyridine / 3.5 h / -5 - 20 °C View Scheme

1: 63 percent / Fe powder; HOAc / propan-2-ol / 1.5 h / Heating 2: pyridine / 3.5 h / -5 - 20 °C View Scheme

in pyridine T=-5 - 20°C; 3.5 h;