反应详情

A mixture of 3.7 g of 4-oxo-4,5,6,7-tetrahydrothieno[2,3-b]thiepin-5-acetic acid and 2.6 g of 4-chlorophenylhydrazine in 50 ml of ethanol is refluxed under heating for 6.5 hours. Then, the reaction mixture is concentrated under reduced pressure. The resulting residue is dissolved in 40 ml of acetic acid and the mixture is further refluxed under heating for 1.5 hours. After cooling, the mixture is concentrated under reduced pressure, and the residue is subjected to column chromatography on silica gel and eluted with chloroform. The crystals obtained from the fraction are recrystallized from a mixed solvent of chloroform and ethanol to give 1.7 g of 2-(4-chlorophenyl)-4,4a, 5,6-tetrahydrothieno[2',3':2,3]thiopyrano[4,5-c]pyridazin-3(2H)-one as pale brown crystals, melting at 134°-135° C.

1. temperatureis refluxed
2. temperatureunder heating for 6.5 hours
3. concentrationThen, the reaction mixture is concentrated under reduced pressure
4. dissolutionThe resulting residue is dissolved in 40 ml of acetic acid
5. temperaturethe mixture is further refluxed
6. temperatureunder heating for 1.5 hours
7. temperatureAfter cooling
8. concentrationthe mixture is concentrated under reduced pressure
9. washeluted with chloroform
10. customThe crystals obtained from the fraction
11. customare recrystallized from a mixed solvent of chloroform and ethanol