Ethyl Acetate → (E)-[2-(6-bromo-4-methyl-2-propylbenzimidazol-1-yl)methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene]acetonitrile

Temperature

0 °C

[step 1] Under a nitrogen atmosphere, 6-bromo-4-methyl-2-propylbenzimidazole (WO2004082621; 300 mg, 1.19 mmol) was dissolved in DMF (3 mL), and the mixture was cooled to 0° C. Potassium carbonate (829 mg, 6.00 mmol) was added, and the mixture was stirred at room temperature for 20 min. To this mixture was added (E)-2-(2-bromomethyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene)acetonitrile (421 mg, 1.30 mmol) obtained in Reference Example B1, and the mixture was stirred at room temperature for 4 hr. Ethyl acetate was added to the mixture, and 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 (hexane/ethyl acetate=3/1 to 1/3) to give (E)-[2-(6-bromo-4-methyl-2-propylbenzimidazol-1-yl)methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene]acetonitrile (615 mg, 95%).

1. customobtained in Reference Example B1
2. stirringthe mixture was stirred at room temperature for 4 hr
3. washthe organic layer was washed with brine
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (hexane/ethyl acetate=3/1 to 1/3)

ORD record

ord-0f25278f54a848e49ce1d340ae9eaeee

Source dataset

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08486980B2