Cesium carbonate → Tert-butyl 2-(2-phenylpyrimidin-5-yl)thiazole-4-carboxylate

HRID 2096347Notes

Reaction equation

HRID 2096347 reaction equation
C(=O)([O-])[O-].[Cs+].[Cs+].[C:7]([O:11][C:12]([C:14]1[N:15]=[CH:16][S:17][CH:18]=1)=[O:13])([CH3:10])([CH3:9])[CH3:8].C1(P(C2C=CC=CC=2)C2C3OC4C(=CC=CC=4P(C4C=CC=CC=4)C4C=CC=CC=4)C(C)(C)C=3C=CC=2)C=CC=CC=1.Br[C:62]1[CH:63]=[N:64][C:65]([C:68]2[CH:73]=[CH:72][CH:71]=[CH:70][CH:69]=2)=[N:66][CH:67]=1>CN(C=O)C.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[C:68]1([C:65]2[N:64]=[CH:63][C:62]([C:16]3[S:17][CH:18]=[C:14]([C:12]([O:11][C:7]([CH3:10])([CH3:8])[CH3:9])=[O:13])[N:15]=3)=[CH:67][N:66]=2)[CH:69]=[CH:70][CH:71]=[CH:72][CH:73]=1

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 143877455-Bromo-2-phenylpyrimidineHCID 16744294Tert-butyl 1,3-thiazole-4-carboxylate

Product 1

HCID 59252449Tert-butyl 2-(2-phenylpyrimidin-5-yl)thiazole-4-carboxylate

Reagents, catalysts & solvents 2

HCID 167845palladium(II) acetateCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
110 °C

Procedure

In a sealed tube, cesium carbonate (1.95 g, 6.00 mmol), tert-butyl-4-thiazolecarboxylate (556 mg, 3.00 mmol; prepared according to the procedure described in Organic Letters, 2008, 10(13), 2909), palladium(II) acetate (47 mg, 0.21 mmol) and 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (240 mg, 0.42 mmol) were combined with 5-bromo-2-phenylpyrimidine (705 mg, 3.00 mmol) in dry DMF (11 mL) and the mixture heated at 110° C. for 18 hours with stirring. The mixture was cooled to room temperature and filtered through Celite washing with hot ethyl acetate. Solvent was removed under reduced pressure and the residue purified by silica gel flash chromatography (9:1 to 3:2 v/v hexane-ethyl acetate gradient) through a 40-g Silicycle® flash silica cartridge. The title compound was obtained as a white solid (646 mg, 63% yield); Rf 0.75 with 1:1 v/v hexane-ethyl acetate; 1H-NMR (300 MHz; CDCl3) δ 9.37 (s, 2H), 8.52 (dd, 2H), 8.15 (s, 1H), 7.54 (m, 3H), 1.64 (s, 9H); MS (ESI+) m/z 340 (M+1); H-PGDS FPBA IC50: 5.9 μM.

Workup

  1. customprepared
  2. temperatureThe mixture was cooled to room temperature
  3. filtrationfiltered through Celite
  4. washwashing with hot ethyl acetate
  5. customSolvent was removed under reduced pressure
  6. customthe residue purified by silica gel flash chromatography (9:1 to 3:2 v/v hexane-ethyl acetate gradient) through a 40-g Silicycle® flash silica cartridge

Sources & evidence

ORD record
ord-79895c7be54d4571a43e416c5363cbfd
Source dataset
uspto-grants-2013_05
Patent number
US08450326B2

Reaction notes

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