Ammonia → (E)-{2-[4-methyl-6-(1,3,4-oxadiazol-2-yl)-2-propylbenzimidazol-1-yl]methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene}acetonitrile

Participants

Reaction Conditions

Reaction Steps

[step 2] (E)-{2-[4-Methyl-6-(hydrazinocarbonyl)-2-propylbenzimidazol-1-yl]methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene}acetonitrile (40 mg, 0.08 mmol) obtained in step 1 was suspended in acetic acid (3 mL), triethyl orthoformate (3 mL) was added, and the mixture was stirred at 50° C. for 6 hr. Water (10 mL) was added to the mixture, and the mixture was neutralized to pH 9 with 30% aqueous ammonia solution, and extracted twice with chloroform. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform:methanol=9:1) to give (E)-{2-[4-methyl-6-(1,3,4-oxadiazol-2-yl)-2-propylbenzimidazol-1-yl]methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene}acetonitrile (24 mg, 58%).

Provenance & Evidence