2-Hydrazinopyridine → 2-Pyridin-3-yl-3-(pyridin-2-ylhydrazono)propionic acid ethyl ester

Participants

Reaction Steps

2.90 g (15.0 mmol) of the compound from Example 2A and 1.72 g (15.8 mmol) 2-pyridylhydrazine are dissolved in 75 ml ethanol and the mixture is stirred at RT for 4 d. The reaction mixture is freed from the solvent on a rotary evaporator and the residue is chromatographed over silica gel 60 (mobile phase: methylene chloride→methylene chloride/methanol 10:1→methylene chloride/methanol 2:1). The product fractions are combined and the solvent is removed on a rotary evaporator. After drying in vacuo, 3.95 g (93% of th.) of the title compound are obtained.

Provenance & Evidence