Sodium hydride → 1-(2,4-Dichlorophenyl)-6-[1-(2-methoxyethoxy)propyl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole

To a solution of 1-[1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propan-1-ol (300 mg, 0.797 mmol) in N,N-dimethylformamide (3.0 mL) was added sodium hydride (60% in oil, 35.0 mg, 0.877 mmol), and the mixture was stirred at room temperature for 10 min. To the mixture was added 2-bromoethyl methyl ether (166 mg, 1.19 mmol), and the mixture was stirred at room temperature for 3 hr. The mixture was diluted with water, and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 10-50% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the title compound as a colorless amorphous (218 mg, 0.502 mmol, 63%).

1. stirringthe mixture was stirred at room temperature for 3 hr
2. extractionextracted with ethyl acetate
3. washThe combined organic layer was washed with brine
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by flash column chromatography on silica gel eluting with a 10-50% ethyl acetate/n-hexane gradient mixture
8. concentrationThe filtrate was concentrated in vacuo

ORD record

ord-00f2436ab3344608825ca97f775485ba

Source dataset

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08785460B2