2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → 6-(4-(4-(2-Ethoxyphenyl)-1-piperazinyl)-1-butenyl)carbostyril

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Reaction Steps

2.0 Grams of 6-{4-[4-(2-ethoxyphenyl)-1-piperazinyl]-1-butenyl}-3,4-dihydrocarbostyril and 3.5 g of DDQ were mixed in 20 ml of benzene and the mixture was refluxed by heating for 5 hours. The reaction mixture was then concentrated under a reduced pressure and the residue thus obtained was extracted with chloroform. The chloroform layer was washed with 5%-NaHCO3 aqueous solution three times then washed with water twice and dried. Chloroform was removed by distillation and the residue obtained was purified by a silica-gel column chromatography and recrystallized from methanol to obtain 0.12 g of 6-{4-[4-(2-ethoxyphenyl)-1-piperazinyl]-1-butenyl}carbostyril in colorless needle-like crystals. Melting point: 225°-228° C.

Provenance & Evidence