Sodium ethoxide → 9-Chloro-6-[1-(difluoromethoxy)-2,2,2-trifluoroethyl]-1-(2-ethoxy-4,6-dimethylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole

HRID 1628774Notes

Reaction equation

HRID 1628774 reaction equation
[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:15]4[C:16]([CH3:23])=[N:17][C:18](Cl)=[N:19][C:20]=4[CH3:21])[CH2:12][CH2:13][CH2:14][N:7]3[C:6]=2[C:5]([CH:24]([O:29][CH:30]([F:32])[F:31])[C:25]([F:28])([F:27])[F:26])=[CH:4][CH:3]=1.[O-:33][CH2:34][CH3:35].[Na+]>C(O)C>[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:15]4[C:16]([CH3:23])=[N:17][C:18]([O:33][CH2:34][CH3:35])=[N:19][C:20]=4[CH3:21])[CH2:12][CH2:13][CH2:14][N:7]3[C:6]=2[C:5]([CH:24]([O:29][CH:30]([F:31])[F:32])[C:25]([F:27])([F:26])[F:28])=[CH:4][CH:3]=1

Participants

4

Reactant 2

HCID 2723922Sodium ethoxideHCID 577862249-Chloro-1-(2-chloro-4,6-dimethylpyrimidin-5-yl)-6-[1-(difluoromethoxy)-2,2,2-trifluoroethyl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole

Product 1

HCID 577861889-Chloro-6-[1-(difluoromethoxy)-2,2,2-trifluoroethyl]-1-(2-ethoxy-4,6-dimethylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Conditions

Temperature
50 °C

Procedure

A mixture of 9-chloro-1-(2-chloro-4,6-dimethylpyrimidin-5-yl)-6-[1-(difluoromethoxy)-2,2,2-trifluoroethyl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole (142 mg, 0.286 mmol) and sodium ethoxide (20% solution in ethanol, 292 mg, 0.858 mmol) in ethanol (1.0 mL) was stirred at 50° C. for 5 hr. The mixture was concentrated in vacuo, 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 50-100% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was purified by preparative HPLC to give a mixture contained an intermediate of the title compound as the trifluoroacetic acid salt. The mixture was washed with aqueous sodium hydrogen carbonate and extracted with ethyl acetate. The extract was washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuo to give the solid, which was recrystallized from ethyl acetate/n-hexane to give the title compound as a colorless crystal (65.3 mg, 0.286 mmol, 45%).

Workup

  1. concentrationThe mixture was concentrated in vacuo
  2. additiondiluted with water
  3. extractionextracted with ethyl acetate
  4. washThe combined organic layer was washed with brine
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by flash column chromatography on silica gel eluting with a 50-100% ethyl acetate/n-hexane gradient mixture
  9. concentrationThe filtrate was concentrated in vacuo
  10. customto give the solid, which
  11. customwas purified by preparative HPLC
  12. customto give a mixture

Sources & evidence

ORD record
ord-6d46322ec3744757b4aa09b4d45f22e1
Source dataset
uspto-grants-2014_07
Patent number
US08785460B2

Reaction notes

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