Benzophenone imine → N-(5-(diphenylmethyleneamino)-2-methoxypyridin-3-yl)methanesulfonamide

HRID 1621937Notes

Reaction equation

HRID 1621937 reaction equation
Br[C:2]1[CH:3]=[C:4]([NH:10][S:11]([CH3:14])(=[O:13])=[O:12])[C:5]([O:8][CH3:9])=[N:6][CH:7]=1.CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2.CC([O-])(C)C.[Na+].[C:63]1([C:69]([C:71]2[CH:76]=[CH:75][CH:74]=[CH:73][CH:72]=2)=[NH:70])[CH:68]=[CH:67][CH:66]=[CH:65][CH:64]=1>CN(C=O)C.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[C:63]1([C:69](=[N:70][C:2]2[CH:3]=[C:4]([NH:10][S:11]([CH3:14])(=[O:13])=[O:12])[C:5]([O:8][CH3:9])=[N:6][CH:7]=2)[C:71]2[CH:72]=[CH:73][CH:74]=[CH:75][CH:76]=2)[CH:68]=[CH:67][CH:66]=[CH:65][CH:64]=1

Participants

7

Reactant 4

HCID 136809Benzophenone imineHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 23676156Sodium t-butoxideHCID 59860141N-(5-Bromo-2-methoxypyridin-3-yl)methanesulfonamide

Product 1

HCID 86647076N-(5-(diphenylmethyleneamino)-2-methoxypyridin-3-yl)methanesulfonamideYield 39%

Reagents, catalysts & solvents 2

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
120 °C

Procedure

To a 5 mL microwave reaction tube was added N-(5-bromo-2-methoxypyridin-3-yl)methanesulfonamide (0.208 g, 0.739 mmol), xantphos (Acros, 0.044 g, 0.077 mmol), Pd2dba3 (Aldrich, 0.034 g, 0.037 mmol), NaOtBu (Aldrich, 0.178 g, 1.85 mmol) and diphenylmethanimine (Aldrich, 0.130 mL, 0.776 mmol) in DMF (3 mL). The mixture was degassed by bubbling argon through for 5 min. The tube was heated in a microwave reactor (Biotage) at 120° C. for 30 min. The reaction mixture was partitioned between tris-HCl buffer (1 M, pH 7.0) (20 mL) and EtOAc (10 mL). The aqueous phase was extracted with EtOAc (20 mL). The combined organic phases were washed with saturated aqueous sodium chloride (20 mL). The organic phase was dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by silica gel column chromatography (50 g, eluent: EtOAc in hexanes 20% to 80%) to afford N-(5-(diphenylmethyleneamino)-2-methoxypyridin-3-yl)methanesulfonamide (0.109 g, 39% yield) as a light yellow solid. 1H NMR (400 MHz, CDCl3) δ ppm 7.69-7.74 (m, 2H) 7.53 (d, J=2.35 Hz, 1H) 7.46-7.51 (m, 1H) 7.38-7.44 (m, 2H) 7.30-7.36 (m, 3H) 7.12-7.18 (m, 3H) 6.60 (s, 1H) 3.94 (s, 3H) 2.69 (s, 3H).

Workup

  1. customThe mixture was degassed
  2. customby bubbling argon through for 5 min
  3. customThe reaction mixture was partitioned between tris-HCl buffer (1 M, pH 7.0) (20 mL) and EtOAc (10 mL)
  4. extractionThe aqueous phase was extracted with EtOAc (20 mL)
  5. washThe combined organic phases were washed with saturated aqueous sodium chloride (20 mL)
  6. dry with materialThe organic phase was dried over sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo
  9. customThe crude product was purified by silica gel column chromatography (50 g, eluent: EtOAc in hexanes 20% to 80%)

Sources & evidence

ORD record
ord-c9dfe9456b1346a7ba2e3744948ed334
Source dataset
uspto-grants-2014_07
Patent number
US08772480B2

Reaction notes

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