Triacetoxyperiodinane → 9-Methoxy-1-(2-methoxy-4,6-dimethylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehyde

HRID 1399373Notes

Reaction equation

HRID 1399373 reaction equation
CC(OI1(OC(C)=O)(OC(C)=O)OC(=O)C2C=CC=CC1=2)=O.[CH3:23][O:24][C:25]1[C:33]2[N:32]=[C:31]3[N:34]([C:38]4[C:39]([CH3:47])=[N:40][C:41]([O:45][CH3:46])=[N:42][C:43]=4[CH3:44])[CH2:35][CH2:36][CH2:37][N:30]3[C:29]=2[C:28]([CH2:48][OH:49])=[CH:27][CH:26]=1>CS(C)=O.C(#N)C.C(=O)([O-])O.[Na+]>[CH3:23][O:24][C:25]1[CH:26]=[CH:27][C:28]([CH:48]=[O:49])=[C:29]2[C:33]=1[N:32]=[C:31]1[N:34]([C:38]3[C:39]([CH3:47])=[N:40][C:41]([O:45][CH3:46])=[N:42][C:43]=3[CH3:44])[CH2:35][CH2:36][CH2:37][N:30]21

Participants

6

Reactant 2

HCID 159087TriacetoxyperiodinaneHCID 57786030[9-Methoxy-1-(2-methoxy-4,6-dimethylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]methanol

Product 1

HCID 577857769-Methoxy-1-(2-methoxy-4,6-dimethylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehydeYield 61.7%

Reagents, catalysts & solvents 3

HCID 679Dimethyl SulfoxideSolventHCID 6342AcetonitrileSolventHCID 516892Sodium BicarbonateSolvent

Procedure

Dess-Martin reagent (1.31 g, 3.09 mmol) was added to a stirred solution of [9-methoxy-1-(2-methoxy-4,6-dimethylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]methanol (761 mg, 2.06 mmol) in dimethyl sulfoxide (0.50 mL) and acetonitrile (8.2 mL) at 0 ° C., and the mixture was stirred at room temperature for 3 hr. The mixture was diluted with saturated 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 0-5% methanol/ethyl acetate gradient mixture. The eluate was concentrated in vacuo to give the title compound as a brown solid (467 mg).

Workup

  1. extractionextracted with ethyl acetate
  2. washThe combined organic layer was washed with brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. customThe residue was purified by flash column chromatography on silica gel eluting with a 0-5% methanol/ethyl acetate gradient mixture
  7. concentrationThe eluate was concentrated in vacuo

Sources & evidence

ORD record
ord-7eadfa4cdc35492eacb5f87bdf8b9aaa
Source dataset
uspto-grants-2014_12
Patent number
US08901141B2

Reaction notes

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