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A facile synthesis of novel 3-functionalized pyridine derivatives has been accomplished through the reaction of 4-hydroxy-3-benzoylpyridin-2(1 H )-ones and  β -nitrostyrenes in the presence of catalytic amount of pyrrolidine (10 mol%). In this process, the desired products were obtained with 72–87% yields using ethanol as solvent at 80 °C for 4 h. In addition, a total of 19 examples were obtained, which exhibited the broad substrate scope of the transformation. The reaction process may involve the formation of an unstable enamine intermediate and then undergo hydrolysis to afford 4-hydroxy-3-benzoylpyridin-2(1 H )-one derivatives.

Synthesis of 4-hydroxy-3-benzoylpyridin-2(1 H )-one derivatives using pyrrolidine as catalyst