Water → HCID 67432425, compound

HRID 2172934Notes

Reaction equation

HRID 2172934 reaction equation
[Si:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([C:15]2[N:16]=[C:17]([C:22]3[CH:27]=[CH:26][C:25]([N:28]([CH3:30])[CH3:29])=[CH:24][CH:23]=3)[C:18]([NH2:21])=[N:19][CH:20]=2)=[CH:11][CH:10]=1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[Si:31]([O:38][C:39]1[CH:44]=[CH:43][C:42]([CH2:45][C:46](Cl)=[O:47])=[CH:41][CH:40]=1)([C:34]([CH3:37])([CH3:36])[CH3:35])([CH3:33])[CH3:32].O>CN(C)C1C=CN=CC=1.N1C=CC=CC=1>[Si:31]([O:38][C:39]1[CH:40]=[CH:41][C:42]([CH2:45][C:46]([NH:21][C:18]2[C:17]([C:22]3[CH:27]=[CH:26][C:25]([N:28]([CH3:30])[CH3:29])=[CH:24][CH:23]=3)=[N:16][C:15]([C:12]3[CH:11]=[CH:10][C:9]([O:8][Si:1]([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2])=[CH:14][CH:13]=3)=[CH:20][N:19]=2)=[O:47])=[CH:43][CH:44]=1)([C:34]([CH3:37])([CH3:36])[CH3:35])([CH3:33])[CH3:32]

Participants

6

Reactant 3

HCID 962WaterHCID 121887072-[4-(Tert-butyldimethylsilyloxy)phenyl]acetyl chlorideHCID 67430414HCID 67430414, compound

Product 1

HCID 67432425HCID 67432425, compoundYield 40%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 1049PyridineSolvent

Conditions

Temperature
50 °C

Procedure

Under an argon atmosphere, to a mixture of 5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-[4-(dimethylamino)phenyl]pyrazin-2-amine (7n) (315 mg, 749 μmol) and 4-(dimethylamino)pyridine (14.8 mg, 121 μmol) dissolved in anhydrous pyridine (15 mL) was added 2-[4-(tert-butyldimethylsilyloxy)phenyl]acetylchloride (10) prepared above at 0° C. and the mixture was heated with stirring at 50° C. for 20 hours. After cooling to room temperature, to this was added water and the product was extracted with ethyl acetate (100 mL×3). The combined organic extract was washed successively with water (200 mL) and brine (200 mL), followed by drying over anhydrous sodium sulfate. After filtration and concentration under reduced pressure, the residue was purified by column chromatography (silica gel 50 g, n-hexane/ethyl acetate=2/1) to give Compound 11n (200 mg, 300 μmol, 40.0%) as a yellow solid. Rf=0.26 (n-hexane/ethyl acetate=2/1); 1H NMR (400 MHz, DMSO-d6) δ 0.17 (s, 6H), 0.23 (s, 6H), 0.95 (s, 9H), 0.97 (s, 9H), 2.95 (s, 6H), 3.50 (s, 2H), 6.52-6.65 (AA′BB′, 2H), 6.75-6.85 (AA′BB′, 2H), 6.95-7.05 (AA′BB′, 2H), 7.10-7.20 (AA′BB′, 2H), 7.56-7.66 (AA′BB′, 2H), 8.04-8.10 (AA′BB′, 2H), 8.82 (s, 1H), 10.41 (s, 1H); 13C NMR (67.8 MHz, DMSO-d6) δ −4.5 (2C), −4.6 (2C), 17.9, 18.0, 25.5 (6C), 39.8 (2C), 41.8, 111.3 (2C), 119.5 (2C), 120.3 (2C), 124.4, 128.05, 128.07 (2C), 128.9 (2C), 129.2, 130.4 (2C), 135.8, 142.0, 147.78, 147.84, 150.5, 153.8, 156.6, 169.3; IR (KBr, cm−1) 527, 685, 781, 839, 914, 1080, 1167, 1256, 1371, 1441, 1508, 1607, 1668, 2857, 2928, 2955, 3233

Workup

  1. customprepared above at 0° C.
  2. temperaturethe mixture was heated
  3. temperatureAfter cooling to room temperature
  4. extractionthe product was extracted with ethyl acetate (100 mL×3)
  5. extractionThe combined organic extract
  6. washwas washed successively with water (200 mL) and brine (200 mL)
  7. dry with materialby drying over anhydrous sodium sulfate
  8. filtrationAfter filtration and concentration under reduced pressure
  9. customthe residue was purified by column chromatography (silica gel 50 g, n-hexane/ethyl acetate=2/1)

Sources & evidence

ORD record
ord-4cf0336aaff44649b7b4e3376597fdee
Source dataset
uspto-grants-2015_06
Patent number
US09056840B2

Reaction notes

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