Sodium Carbonate → HCID 86680488, compound

HRID 2406459Notes

Reaction equation

HRID 2406459 reaction equation
Br[C:2]1[S:3][C:4]([CH:7]=[O:8])=[CH:5][N:6]=1.CC1(C)C(C)(C)OB([C:17]2[CH:18]=[N:19][NH:20][CH:21]=2)O1.C(=O)([O-])[O-].[Na+].[Na+]>C1(C)C=CC=CC=1.C(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>[NH:19]1[CH:18]=[C:17]([C:2]2[S:3][C:4]([CH:7]=[O:8])=[CH:5][N:6]=2)[CH:21]=[N:20]1

Participants

7

Reactant 3

HCID 10340Sodium CarbonateHCID 27732592-Bromo-1,3-thiazole-5-carbaldehydeHCID 27740104-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

Product 1

HCID 86680488HCID 86680488, compoundYield 54%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 702EthanolSolventHCID 1140TolueneSolvent

Conditions

Temperature
70 °C

Procedure

To a solution of 2-bromothiazole-5-carbaldehyde (500 mg, 2.6 mmol) in toluene (15 mL) and ethanol (7 mL) was added 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (606 mg, 3.1 mmol), 2M sodium carbonate solution (7.3 mL) and Pd(PPh3)4 (30 mg, 0.02 mmol). The reaction mixture was purged with argon for 15 min and the resulting mixture was heated at 70° C. for 4 h. The reaction mixture was concentrated, diluted with water (100 mL), and extracted with ethyl acetate (2×200 mL). The combined extracts were washed with brine solution (20 mL), dried over Na2SO4, filtered and concentrated to under vacuum to obtain crude product. The crude product was purified by flash chromatography (60-120μ; 50% ethyl acetate in hexane) to afford 2-(1H-pyrazol-4-yl)thiazole-5-carbaldehyde as yellow solid (250 mg, 54% yield). 1H NMR (400 MHz, DMSO-d6): δ 13.49 (br s, 1H), 10.00 (s, 1H), 8.61 (s, 1H), 8.55 (s, 1H), 8.09 (s, 1H); LC-MS m/z calculated for [M+H]+ 180.02, found 180.1.

Workup

  1. customThe reaction mixture was purged with argon for 15 min
  2. concentrationThe reaction mixture was concentrated
  3. additiondiluted with water (100 mL)
  4. extractionextracted with ethyl acetate (2×200 mL)
  5. washThe combined extracts were washed with brine solution (20 mL)
  6. dry with materialdried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated to under vacuum
  9. customto obtain crude product
  10. customThe crude product was purified by flash chromatography (60-120μ; 50% ethyl acetate in hexane)

Sources & evidence

ORD record
ord-7856d6ac1f2440b79b965b431228902c
Source dataset
uspto-grants-2014_08
Patent number
US08809372B2

Reaction notes

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