Potassium Carbonate → HCID 66681386, compound

HRID 909431Notes

Reaction equation

HRID 909431 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH:12]=[CH:11][CH:10]=[C:9]1B(O)O)=[O:7])([CH3:4])([CH3:3])[CH3:2].Br[C:17]1[S:18][C:19]([C:22]([O:24][CH2:25][CH3:26])=[O:23])=[CH:20][N:21]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(=O)([O-])[O-].[K+].[K+]>COCCOC.C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C(OCC)(=O)C.O>[C:1]([O:5][C:6]([N:8]1[CH:12]=[CH:11][CH:10]=[C:9]1[C:17]1[S:18][C:19]([C:22]([O:24][CH2:25][CH3:26])=[O:23])=[CH:20][N:21]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

9

Reactant 4

HCID 11430Potassium CarbonateHCID 11776TriphenylphosphineHCID 27343211-(tert-Butoxycarbonyl)-2-pyrroleboronic AcidHCID 3614103Ethyl 2-bromothiazole-5-carboxylate

Product 1

HCID 66681386HCID 66681386, compoundYield 74.1%

Reagents, catalysts & solvents 4

HCID 167845palladium(II) acetateCatalystHCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
100 °C

Procedure

Commercially available 1-(t-butoxycarbonyl)pyrrole-2-boronic acid (850 mg, 4.3 mmol) was dissolved in 1,2-dimethoxyethane (30 mL), and commercially available ethyl 2-bromo-1,3-thiazole-5-carboxylate (0.50 mL, 3.35 mmol), palladium (II) acetate (38.0 mg, 0.169 mmol), triphenylphosphine (176 mg, 0.671 mmol) and an aqueous potassium carbonate solution (3M, 2.20 mL, 6.60 mmol) were added, followed by stirring at 100° C. for 14 hours under nitrogen atmosphere. The reaction solution was cooled to room temperature, water (30 mL) and ethyl acetate (40 mL) were added, and the solution was separated. The organic layer was washed with saturated brine, and subsequently dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was purified using silica gel column chromatography (elution solvent: ethyl acetate/hexane=0%-30%) to afford the desired compound (800 mg, yield 74%) as a yellow solid.

Workup

  1. temperatureThe reaction solution was cooled to room temperature
  2. customthe solution was separated
  3. washThe organic layer was washed with saturated brine
  4. dry with materialsubsequently dried over anhydrous magnesium sulfate
  5. distillationThe solvent was distilled off under reduced pressure
  6. customthe resulting residue was purified
  7. washsilica gel column chromatography (elution solvent: ethyl acetate/hexane=0%-30%)

Sources & evidence

ORD record
ord-d4fb172a5504431fbfa165ac92997575
Source dataset
uspto-grants-2011_09
Patent number
US08017610B2

Reaction notes

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