反应详情

A mixture of 3-amino-2-[3-[(E)-2-[5-[(E)-2-(4-pyridyl)vinyl]pyridin-3-yl]vinyl]phenylamino]pyridine (260 mg) and 3-pyridylpyruvic acid (121 mg) in ethanol (5 ml) was stirred under reflux for 5 hours. After removal of the solvent, the residue was chromatographed on silica gel column (chloroform-methanol, 9:1) and crystallized from methanol to give 2-(3-pyridylmethyl)-3-oxo-4-[3-[(E)-2-[5-[(E)-2-(4-pyridyl)vinyl]pyridin-3-yl]vinyl]phenyl]-3,4-dihydropyrido[2,3-b]pyrazine (208 mg).

1. temperatureunder reflux for 5 hours
2. customAfter removal of the solvent
3. customthe residue was chromatographed on silica gel column (chloroform-methanol, 9:1)
4. customcrystallized from methanol