Cesium carbonate → HCID 68428553, compound

HRID 642565Notes

Reaction equation

HRID 642565 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[N:11]=[C:10](Br)[C:9]2[N:13]=[C:14]([C:16]([CH3:19])([CH3:18])[CH3:17])[S:15][C:8]=2[C:7]=1[OH:20])=[O:5])[CH3:2].[CH:21](B(O)O)=[CH:22][C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.C(OCC)(=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:1]([O:3][C:4]([C:6]1[N:11]=[C:10]([CH:21]=[CH:22][C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)[C:9]2[N:13]=[C:14]([C:16]([CH3:19])([CH3:18])[CH3:17])[S:15][C:8]=2[C:7]=1[OH:20])=[O:5])[CH3:2]

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 27343812-Phenylvinylboronic acidHCID 86617377HCID 86617377, compound

Product 1

HCID 68428553HCID 68428553, compound

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Procedure

Under a nitrogen atmosphere 4-bromo-2-tert-butyl-7-hydroxy-thiazolo[4,5-c]pyridine-6-carboxylic acid ethyl ester (300 mg, 0.835 mmol), styreneboronic acid (185 mg, 1.25 mmol), cesium carbonate (675 mg, 2.08 mmol), and tetrakis(triphenylphosphine)palladium(0)(143 mg, 0.12 mmol) were suspended in 4 mL of anhydrous 1,4 dioxane. The reaction was heated at reflux temperature for 18 h, then cooled to room temperature and diluted with ethyl acetate. The organic mixture was successively washed with water, saturated sodium bicarbonate, and brine solutions. The organic fractions were dried over anhydrous sodium sulfate and concentrated to a crude solid residue, which was then purified by column chromatography, eluting the desired product from silica gel with a gradient of 10-90% ethyl acetate in hexanes: 180 mg of a yellow oil. MS: (+) m/z 382.9 (M+1).

Workup

  1. temperatureThe reaction was heated
  2. temperatureat reflux temperature for 18 h
  3. washThe organic mixture was successively washed with water, saturated sodium bicarbonate, and brine solutions
  4. dry with materialThe organic fractions were dried over anhydrous sodium sulfate
  5. concentrationconcentrated to a crude solid residue, which
  6. customwas then purified by column chromatography
  7. washeluting the desired product from silica gel with a gradient of 10-90% ethyl acetate in hexanes

Sources & evidence

ORD record
ord-019a3075bb2743adb602ff869a340712
Source dataset
uspto-grants-2010_04
Patent number
US07696223B2

Reaction notes

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