Hydrochloric Acid → 2-Hydroxy-9-ethoxycarbonyl-10,11-dihydrodibenzo[b,f]thiepin

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반응 단계

An amount of 1.7g of 2-hydroxy-9-carboxy-10,11-dihydrodibenzo[b,f]thiepin was dissolved in 50ml of anhydrous ethanol and the mixture was refluxed for 3 hours, while hydrogen chloride gas was bubbled into the mixture. The solvent was distilled off to obtain the residue which was dissolved in the mixed solvent of ethyl acetate-benzene. The solution was washed with saturated sodium chloride solution and freed of solvent by distillation to obtain 1.6g (85%) of 2-hydroxy-9-ethoxycarbonyl-10,11-dihydrodibenzo[b,f]thiepin as brown crystals having a melting point of 125°-129° C.

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