Potassium Carbonate → 5-[9-Chloro-6-(1-ethylpropyl)-3,4-dihydropyrimido[1,2-a]benzimidazol-1(2H)-yl]-N,N,4-trimethylpyridin-2-amine

HRID 1628871Notes

Reaction equation

HRID 1628871 reaction equation
[Cl:1][C:2]1[C:10]2[N:9]=[C:8]([NH:11][C:12]3[CH:13]=[N:14][C:15]([N:19]([CH3:21])[CH3:20])=[CH:16][C:17]=3[CH3:18])[N:7]([CH2:22][CH2:23][CH2:24]O)[C:6]=2[C:5]([CH:26]([CH2:29][CH3:30])[CH2:27][CH3:28])=[CH:4][CH:3]=1.CS(Cl)(=O)=O.C(=O)(O)[O-].[Na+].C(=O)([O-])[O-].[K+].[K+]>N1C=CC=CC=1.O>[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:12]4[C:17]([CH3:18])=[CH:16][C:15]([N:19]([CH3:21])[CH3:20])=[N:14][CH:13]=4)[CH2:24][CH2:23][CH2:22][N:7]3[C:6]=2[C:5]([CH:26]([CH2:29][CH3:30])[CH2:27][CH3:28])=[CH:4][CH:3]=1

Participants

7

Reactant 4

HCID 11430Potassium CarbonateHCID 31297Methanesulfonyl chlorideHCID 516892Sodium BicarbonateHCID 687713093-[4-chloro-2-{[6-(dimethylamino)-4-methylpyridin-3-yl]amino}-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]propan-1-ol

Product 1

HCID 577859605-[9-Chloro-6-(1-ethylpropyl)-3,4-dihydropyrimido[1,2-a]benzimidazol-1(2H)-yl]-N,N,4-trimethylpyridin-2-amineYield 52%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 1049PyridineSolvent

Procedure

To a solution of 3-[4-chloro-2-{[6-(dimethylamino)-4-methylpyridin-3-yl]amino}-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]propan-1-ol (100 mg, 0.233 mmol) in pyridine (2 mL) was added methanesulfonyl chloride (0.036 mL, 0.465 mmol) dropwise at 0° C. After stirring for 2 hr at room temperature, aqueous sodium bicarbonate was added and the mixture was extracted with ethyl acetate. Organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The crude mesylate was dissolved in 1-methyl-2-pyrrolidinone (1.0 mL) and potassium carbonate (64 mg, 0.465 mmol) was added. The mixture was stirred at 50° C. for 4 hr. Water was added and the mixture was extracted with ethyl acetate. Organic layer was washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 50-80% ethyl acetate/n-hexane gradient mixture followed by recrystallization from ethyl acetate/n-hexane to afford the title compound (50 mg, 0.12 mmol, 52%) as a colorless solid.

Workup

  1. extractionthe mixture was extracted with ethyl acetate
  2. washOrganic layer was washed with brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. concentrationconcentrated in vacuo
  5. dissolutionThe crude mesylate was dissolved in 1-methyl-2-pyrrolidinone (1.0 mL)
  6. stirringThe mixture was stirred at 50° C. for 4 hr
  7. extractionthe mixture was extracted with ethyl acetate
  8. washOrganic layer was washed with water and brine
  9. dry with materialdried over anhydrous sodium sulfate
  10. concentrationconcentrated in vacuo
  11. customThe residue was purified by flash chromatography on silica gel eluting with a 50-80% ethyl acetate/n-hexane gradient mixture
  12. customfollowed by recrystallization from ethyl acetate/n-hexane

Sources & evidence

ORD record
ord-14988b1fb3df4e6a965638ce490959dc
Source dataset
uspto-grants-2014_07
Patent number
US08785460B2

Reaction notes

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