Potassium Carbonate → Methyl 9-chloro-1-[6-(dimethylamino)-2-methylpyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carboxylate

HRID 1628737Notes

Reaction equation

HRID 1628737 reaction equation
CS(Cl)(=O)=O.[Cl:6][C:7]1[C:15]2[N:14]=[C:13]([NH:16][C:17]3[C:18]([CH3:26])=[N:19][C:20]([N:23]([CH3:25])[CH3:24])=[CH:21][CH:22]=3)[N:12]([CH2:27][CH2:28][CH2:29]O)[C:11]=2[C:10]([C:31]([O:33][CH3:34])=[O:32])=[CH:9][CH:8]=1.S([O-])(=O)(=O)C.C(=O)([O-])[O-].[K+].[K+]>O1CCCC1.CN(C)C=O.C(=O)([O-])O.[Na+].C(N(CC)CC)C>[Cl:6][C:7]1[CH:8]=[CH:9][C:10]([C:31]([O:33][CH3:34])=[O:32])=[C:11]2[C:15]=1[N:14]=[C:13]1[N:16]([C:17]3[C:18]([CH3:26])=[N:19][C:20]([N:23]([CH3:25])[CH3:24])=[CH:21][CH:22]=3)[CH2:29][CH2:28][CH2:27][N:12]21

Participants

9

Reactant 4

HCID 11430Potassium CarbonateHCID 31297Methanesulfonyl chlorideHCID 85257MethanesulfonateHCID 68763664Methyl 4-chloro-2-{[6-(dimethylamino)-2-methylpyridin-3-yl]amino}-1-(3-hydroxypropyl)-1H-benzimidazole-7-carboxylate

Product 1

HCID 57786114Methyl 9-chloro-1-[6-(dimethylamino)-2-methylpyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carboxylateYield 70%

Reagents, catalysts & solvents 4

HCID 6228DimethylformamideSolventHCID 8028TetrahydrofuranSolventHCID 8471TriethylamineSolventHCID 516892Sodium BicarbonateSolvent

Conditions

Temperature
0 °C

Procedure

Methanesulfonyl chloride (0.29 mL, 3.66 mmol) was added to a stirred solution of methyl 4-chloro-2-{[6-(dimethylamino)-2-methylpyridin-3-yl]amino}-1-(3-hydroxypropyl)-1H-benzimidazole-7-carboxylate (Reference example 121, 510 mg, 1.22 mmol) and triethylamine (0.68 mL) in tetrahydrofuran (12 mL) at 0° C. The mixture was stirred at 0° C. for 90 min, and concentrated in vacuo. A mixture of the resulting mesylate, potassium carbonate (506 mg, 3.66 mmol) in N,N-dimethylformamide (12 mL) was stirred at 80° C. for 17 hr. The mixture was diluted with aqueous sodium hydrogen carbonate, 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 5-40% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the title compound as a colorless solid (341 mg, 0.853 mmol, 70% in 2 steps).

Workup

  1. concentrationconcentrated in vacuo
  2. stirringwas stirred at 80° C. for 17 hr
  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 5-40% ethyl acetate/n-hexane gradient mixture
  9. concentrationThe filtrate was concentrated in vacuo

Sources & evidence

ORD record
ord-0b2150cc682545bea66cac11c40d5b40
Source dataset
uspto-grants-2014_07
Patent number
US08785460B2

Reaction notes

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