反应详情

To 0.69 g (5 mmol) 3,4-dihydroxybenzaldehyde and 0.6 g (5.3 mmol) cyanoacetylurea in 40 ml ethanol was added 2 drops piperidine. The reaction mixture was refluxed for 2 hours, cooled, filtered and washed with cold ethanol to yield 0.75 g (60% yield) of a yellow-orange solid, m.p. 235° C. (decomposition).

1. temperatureThe reaction mixture was refluxed for 2 hours
2. temperaturecooled
3. filtrationfiltered
4. washwashed with cold ethanol