反应详情

[step 2] (E)-[2-(6-Methoxycarbonyl-4-methyl-2-propylbenzimidazol-1-yl)methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene]acetonitrile (500 mg, 1.05 mmol) obtained in step 1 was dissolved in ethanol (7.5 mL), 2 mol/L aqueous sodium hydroxide solution (2.5 mL) was added, and the mixture was stirred under reflux for 30 min. The mixture was adjusted to pH 2 with 2 mol/L hydrochloric acid, and the precipitated solid was collected by filtration to give the title compound (554 mg) quantitatively.

1. temperatureunder reflux for 30 min
2. filtrationthe precipitated solid was collected by filtration