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

HRID 1628732Notes

Reaction equation

HRID 1628732 reaction equation
CS(Cl)(=O)=O.[Cl:6][C:7]1[C:15]2[N:14]=[C:13]([NH:16][C:17]3[CH:18]=[N:19][C:20]([O:24][CH3:25])=[CH:21][C:22]=3[CH3:23])[N:12]([CH2:26][CH2:27][CH2:28]O)[C:11]=2[C:10]([C:30]([O:32][CH3:33])=[O:31])=[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:30]([O:32][CH3:33])=[O:31])=[C:11]2[C:15]=1[N:14]=[C:13]1[N:16]([C:17]3[CH:18]=[N:19][C:20]([O:24][CH3:25])=[CH:21][C:22]=3[CH3:23])[CH2:28][CH2:27][CH2:26][N:12]21

Participants

9

Reactant 4

HCID 11430Potassium CarbonateHCID 31297Methanesulfonyl chlorideHCID 85257MethanesulfonateHCID 68762858methyl 4-chloro-1-(3-hydroxypropyl)-2-[(6-methoxy-4-methylpyridin-3-yl)amino]-1H-benzimidazole-7-carboxylate

Product 1

HCID 57786217Methyl 9-chloro-1-(6-methoxy-4-methylpyridin-3-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carboxylateYield 37.5%

Reagents, catalysts & solvents 4

HCID 6228DimethylformamideSolventHCID 8028TetrahydrofuranSolventHCID 8471TriethylamineSolventHCID 516892Sodium BicarbonateSolvent

Procedure

Methanesulfonyl chloride (7.8 mL, 35.5 mmol) was added to a stirred solution of methyl 4-chloro-1-(3-hydroxypropyl)-2-[(6-methoxy-4-methylpyridin-3-yl)amino]-1H-benzimidazole-7-carboxylate (Reference example 120, 3.60 g, 8.89 mmol) and triethylamine (6.2 mL) in tetrahydrofuran (44 mL) at 0° C. The mixture was stirred at room temperature for 13 hr, and concentrated in vacuo. A mixture of the resulting mesylate and potassium carbonate (3.67 g, 26.7 mmol) in N,N-dimethylformamide (40 mL) was stirred at 80° C. for 4 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 washed with ethyl acetate/diisopropyl ether to give the title compound as a colorless powder (1.29 g, 3.33 mmol, 37% in 2 steps).

Workup

  1. concentrationconcentrated in vacuo
  2. stirringwas stirred at 80° C. for 4 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. washThe residue was washed with ethyl acetate/diisopropyl ether

Sources & evidence

ORD record
ord-801f40a31584490fb39d8e7190973f53
Source dataset
uspto-grants-2014_07
Patent number
US08785460B2

Reaction notes

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