1: diethyl 4-bromobenzylphosphonate With sodium hydride in N,N-dimethyl-formamide 0.333333 h; cooling; 2: pyridine-3-aldehyde in N,N-dimethyl-formamide Further stages.;

1.1: 3 h / 150 °C / Heating 2.1: NaH / dimethylformamide; various solvent(s) / 0.33 h / cooling 2.2: 61 percent / dimethylformamide View Scheme

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