Dichloromethane → 2-Phenyl-5-(2-phenylpyrimidin-5-yl)oxazole

HRID 2274496Notes

Reaction equation

HRID 2274496 reaction equation
C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(Cl)Cl.Br[C:24]1[CH:25]=[N:26][C:27]([C:30]2[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=2)=[N:28][CH:29]=1.[C:36]1([C:42]2[O:43][CH:44]=[CH:45][N:46]=2)[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=1>C(=O)([O-])[O-].[Ag+2].C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2].O>[C:36]1([C:42]2[O:43][C:44]([C:24]3[CH:25]=[N:26][C:27]([C:30]4[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=4)=[N:28][CH:29]=3)=[CH:45][N:46]=2)[CH:37]=[CH:38][CH:39]=[CH:40][CH:41]=1

Participants

8

Reactant 4

HCID 6344DichloromethaneHCID 11776TriphenylphosphineHCID 5892802-Phenyl-1,3-oxazoleHCID 143877455-Bromo-2-phenylpyrimidine

Product 1

HCID 592523852-Phenyl-5-(2-phenylpyrimidin-5-yl)oxazoleYield 11%

Reagents, catalysts & solvents 3

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 178418647HCID 178418647, compoundCatalystHCID 962WaterSolvent

Conditions

Temperature
60 °C

Procedure

Silver carbonate (317 mg, 1.15 mmol), triphenylphosphine (16 mg, 0.06 mmol) and Pd(dppf)Cl2.CH2Cl2 (24 mg, 5 mole %) were stirred together at room temperature under nitrogen. 5-Bromo-2-phenylpyrimidine (163 mg, 0.69 mmol) was added followed by 2-phenyl-oxazole (84 mg, 0.58 mmol; prepared according to Ohnmacht, S. A. et al., Chemical Communications, 2008, 1241-1243). Finally water (6 mL) was added and the mixture heated for 18 hours at 60° C. The mixture was cooled to room temperature and filtered through Celite washing with DCM and acetone. Purification by silica gel flash chromatography (100% DCM) through a 12-g Silicycle® flash silica cartridge gave title compound as light yellow solid (19 mg, 11% yield); Rf 0.68 with DCM; melting point 228-231° C.; 1H-NMR (300 MHz; DMSO-d6) δ 9.39 (s, 2H), 8.45 (dd, 2H), 8.17 (dd, 2H), 8.11 (s, 1H), 7.54-7.65 (m, 6H); MS (ESI+) m/z 300 (M+1), (ESI−) m/z 298 (M−1); H-PGDS FPBA IC50: 125 μM.

Workup

  1. customprepared
  2. temperatureThe mixture was cooled to room temperature
  3. filtrationfiltered through Celite
  4. washwashing with DCM and acetone
  5. customPurification by silica gel flash chromatography (100% DCM) through a 12-g Silicycle® flash silica cartridge

Sources & evidence

ORD record
ord-b7c062e05b2e451dad37413485ec5a45
Source dataset
uspto-grants-2015_09
Patent number
US09126973B2

Reaction notes

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