phosphate buffer in ethanol T=48°C; 2.5 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1: 66 percent / pyridine / 0.75 h / Ambient temperature 2: 0.1 M phosphate buffer (pH=7.8) / aq. ethanol / 2.5 h / 48 °C View Scheme