pyridine in toluene 1 h; Heating;

1: 50 percent / sodium borohydride / dimethylformamide / 8 h / Ambient temperature 2: 65 percent / pyridine / toluene / 1 h / Heating View Scheme

1: 45 percent / dimethylformamide / 24 h / Heating 2: 50 percent / sodium borohydride / dimethylformamide / 8 h / Ambient temperature 3: 65 percent / pyridine / toluene / 1 h / Heating View Scheme