Triacetoxyperiodinane → 1-[9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propan-1-one

Dess-Martin reagent (1.27 g, 3.00 mmol) was added to a stirred suspension of 1-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propan-1-ol (1.12 g, 2.73 mmol) in acetonitrile (23 mL) at 0° C., and the mixture was stirred at room temperature for 1 hr. The mixture was diluted with saturated aqueous sodium hydrogen carbonate, concentrated in vacuo, and extracted with ethyl acetate/tetrahydrofuran. 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 15-50% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was washed with diisopropyl ether to give the title compound as a colorless powder (980 mg, 2.40 mmol, 88%).

1. concentrationconcentrated in vacuo
2. extractionextracted with ethyl acetate/tetrahydrofuran
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 15-50% ethyl acetate/n-hexane gradient mixture
8. concentrationThe filtrate was concentrated in vacuo
9. customto give the solid, which
10. washwas washed with diisopropyl ether

ORD record

ord-b54627dcc77044f596822671e60e71a4

Source dataset

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08785460B2