Triethylamine → HCID 9812818, compound

HRID 902064Notes

Reaction equation

HRID 902064 reaction equation
Br[C:2]1[S:3][CH:4]=[CH:5][N:6]=1.C(N(CC)CC)C.[CH:14]#[C:15][CH2:16][CH2:17][CH3:18]>COCCOC.[Cu]I.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[C:14]([C:2]1[S:3][CH:4]=[CH:5][N:6]=1)#[C:15][CH2:16][CH2:17][CH3:18]

Participants

7

Reactant 3

HCID 8471TriethylamineHCID 123091-Pentyne2×HCID 764302-Bromothiazole

Product 1

HCID 9812818HCID 9812818, compoundYield 45.2%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 178418476HCID 178418476, compoundCatalystHCID 80711,2-DimethoxyethaneSolvent

Procedure

2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and CuI (183 mg, 0.96 mmol) were combined in DME (30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8 mL, 60 mmol) and PdCl2(PPh3)2 (337 mg, 0.48 mmol) were added and 1-pentyne (979 mg, 14.4 mmol) was added dropwise. The reaction mixture was stirred at ambient temperature for 6 h at which time GC/MS analysis indicated that the reaction was not complete. Additional 1-pentyne (3.0 mL, 29 mmol) was added and the reaction was heated to 35° C. under a condenser. After heating for 16 h, GC/MS analysis indicated that the reaction was complete. The mixture was filtered through Celite.™, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4 filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, 99:1, then 97:3 hexane:ethyl acetate to 2-(1-pentynyl)-1,3-thiazole (820 mg, 44% yield) as a yellow oil. 1H NMR (CDCl3, 300 MHz) Δ7.76 (d, J=3.0 Hz, 1H), 7.28 (d, J=3.0 Hz, 1H), 2.47-2.42 (m, 2H), 1.68-1.60 (m, 2H), 1.08-0.99 (m, 3H). MS (ESI) 151.6 (M+).

Workup

  1. customargon gas was bubbled through the suspension for several minutes
  2. customto deoxygenate the mixture
  3. temperaturethe reaction was heated to 35° C. under a condenser
  4. temperatureAfter heating for 16 h
  5. filtrationThe mixture was filtered through Celite
  6. wash™, and the filter pad was washed thoroughly with ethyl acetate
  7. concentrationThe combined filtrates were concentrated in vacuo
  8. dissolutionthe residue was dissolved in ethyl acetate (300 mL)
  9. washwashed with water (300 mL), brine (300 mL)
  10. dry with materialdried over Na2SO4
  11. filtrationfiltered
  12. concentrationconcentrated in vacuo
  13. customThe residue was purified by column chromatography
  14. washeluting with hexane, 99:1

Sources & evidence

ORD record
ord-a772ad7ab8e94d458c18516331b6f31e
Source dataset
uspto-grants-2008_04
Patent number
US07365074B2

Reaction notes

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