Pyridine → N-{1-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]-2,2,2-trifluoroethyl}acetamide

Temperature

0 °C

A solution of 6-(1-Azido-2,2,2-trifluoroethyl)-9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole (68.2 mg, 0.143 mmol) and triphenylphosphine (56.3 mg, 0.215 mmol) in tetrahydrofuran (5.0 mL) and water (0.10 mL) was stirred at 60° C. for 20 hr. The reaction mixture was concentrated in vacuo and the residue was purified by flash column chromatography on silica gel eluting with a 30-100% ethyl acetate/n-hexane gradient mixture to give 1-[9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]-2,2,2-trifluoroethanamine as a white solid (67.2 mg). To a solution of 1-[9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]-2,2,2-trifluoroethanamine (67.9 mg) and pyridine (0.12 mL, 1.48 mmol) in tetrahydrofuran (5.0 mL) was added acetyl chloride (0.051 mL, 0.717 mmol) at 0° C. The mixture was stirred at 0° C. for 1 hr. Aqueous sodium hydrogen carbonate was added to the reaction mixture at room temperature and the mixture was extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 25-80% ethyl acetate/n-hexane gradient mixture to give the title compound (33.1 mg, 0.067 mmol, 47%) as white crystals.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe organic layer was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated in vacuo
5. customThe residue was purified by flash column chromatography on silica gel eluting with a 25-80% ethyl acetate/n-hexane gradient mixture

ORD record

ord-6bd8ace4e05b4b318ca46be84c05e973

Source dataset

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08785460B2