Potassium Carbonate → HCID 44156374, compound

HRID 1628952Notes

Reaction equation

HRID 1628952 reaction equation
C([O:4][CH:5]([C:8]1[C:13]2[N:14]3[CH2:20][CH2:19][CH2:18][N:17]([C:21]4[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][C:22]=4[Cl:28])[C:15]3=[N:16][C:12]=2[C:11]([Cl:29])=[CH:10][CH:9]=1)[CH2:6][CH3:7])(=O)C.C(=O)([O-])[O-].[K+].[K+]>CO>[Cl:29][C:11]1[C:12]2[N:16]=[C:15]3[N:17]([C:21]4[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][C:22]=4[Cl:28])[CH2:18][CH2:19][CH2:20][N:14]3[C:13]=2[C:8]([CH:5]([OH:4])[CH2:6][CH3:7])=[CH:9][CH:10]=1

Participants

4

Reactant 2

HCID 11430Potassium CarbonateHCID 441562551-[9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propyl acetate

Product 1

HCID 44156374HCID 44156374, compoundYield 71%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of (+)-1-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propyl acetate (80.6 mg, 0.178 mmol) in methanol (1.5 mL) was added potassium carbonate (36.9 mg, 0.267 mmol). The reaction mixture was stirred at room temperature for 1.5 hrs. After the mixture was concentrated, the residue was diluted with water and extracted with ethyl acetate (×3). The combined organic layer was washed with brine (×1), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with a 0-50% ethyl acetate/n-hexane gradient mixture. The resulting solid was recrystallized from ethyl acetate/n-hexane to give the title compound as a colorless powder (51.6 mg, 0.126 mmol, 71%).

Workup

  1. concentrationAfter the mixture was concentrated
  2. additionthe residue was diluted with water
  3. extractionextracted with ethyl acetate (×3)
  4. washThe combined organic layer was washed with brine (×1)
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by silica gel column chromatography
  9. washeluting with a 0-50% ethyl acetate/n-hexane gradient mixture
  10. customThe resulting solid was recrystallized from ethyl acetate/n-hexane

Sources & evidence

ORD record
ord-aa7f7c358c1d4b25a811fba3e84c59ba
Source dataset
uspto-grants-2014_07
Patent number
US08785460B2

Reaction notes

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