Triacetoxyperiodinane → 9-Chloro-1-[6-(dimethylamino)-2-methylpyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehyde

HRID 1628739Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1628739
CC(OI1(OC(C)=O)(OC(C)=O)OC(=O)C2C=CC=CC1=2)=O.[Cl:23][C:24]1[C:32]2[N:31]=[C:30]3[N:33]([C:37]4[C:38]([CH3:46])=[N:39][C:40]([N:43]([CH3:45])[CH3:44])=[CH:41][CH:42]=4)[CH2:34][CH2:35][CH2:36][N:29]3[C:28]=2[C:27]([CH2:47][OH:48])=[CH:26][CH:25]=1>CS(C)=O.C(#N)C.C(=O)([O-])O.[Na+]>[Cl:23][C:24]1[CH:25]=[CH:26][C:27]([CH:47]=[O:48])=[C:28]2[C:32]=1[N:31]=[C:30]1[N:33]([C:37]3[C:38]([CH3:46])=[N:39][C:40]([N:43]([CH3:45])[CH3:44])=[CH:41][CH:42]=3)[CH2:34][CH2:35][CH2:36][N:29]21

Komponenten

6

Edukt 2

HCID 159087TriacetoxyperiodinaneHCID 57785958{9-Chloro-1-[6-(dimethylamino)-2-methylpyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl}methanol

Produkt 1

HCID 577860609-Chloro-1-[6-(dimethylamino)-2-methylpyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehydeAusbeute 75 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 679Dimethyl SulfoxideLösungsmittelHCID 6342AcetonitrileLösungsmittelHCID 516892Sodium BicarbonateLösungsmittel

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

Dess-Martin reagent (410 mg, 0.967 mmol) was added to a stirred solution of {9-chloro-1-[6-(dimethylamino)-2-methylpyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl}methanol (327 mg, 0.879 mmol) in dimethyl sulfoxide (1.0 mL) and acetonitrile (6.0 mL) at 0° C., and the mixture was stirred at 0° C. for 4 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 20-60% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the title compound as a pale yellow solid (243 mg, 0.657 mmol, 75%).

Aufarbeitung

  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 20-60% ethyl acetate/n-hexane gradient mixture
  7. concentrationThe filtrate was concentrated in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-d638c6c4b3634fe9bdf547bbaf3f39f9
Quelldatensatz
uspto-grants-2014_07
Patentnummer
US08785460B2

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