Toluene → 2-(4-{2-[2-(4'-Trifluoromethylbiphenyl-4-yl)-5-methyloxazol-4-yl]ethoxy}phenoxy)-2-methylpropionic acid ethyl ester

HRID 398179Notes

Reaction equation

HRID 398179 reaction equation
[CH2:1]([O:3][C:4](=[O:31])[C:5]([O:8][C:9]1[CH:14]=[CH:13][C:12]([O:15][CH2:16][CH2:17][C:18]2[N:19]=[C:20]([C:24]3[CH:29]=[CH:28][C:27](Br)=[CH:26][CH:25]=3)[O:21][C:22]=2[CH3:23])=[CH:11][CH:10]=1)([CH3:7])[CH3:6])[CH3:2].[F:32][C:33]([F:44])([F:43])[C:34]1[CH:39]=[CH:38][C:37](B(O)O)=[CH:36][CH:35]=1.C1(C)C=CC=CC=1.C(=O)([O-])[O-].[Na+].[Na+]>C(O)C>[CH2:1]([O:3][C:4](=[O:31])[C:5]([O:8][C:9]1[CH:14]=[CH:13][C:12]([O:15][CH2:16][CH2:17][C:18]2[N:19]=[C:20]([C:24]3[CH:29]=[CH:28][C:27]([C:37]4[CH:38]=[CH:39][C:34]([C:33]([F:44])([F:43])[F:32])=[CH:35][CH:36]=4)=[CH:26][CH:25]=3)[O:21][C:22]=2[CH3:23])=[CH:11][CH:10]=1)([CH3:7])[CH3:6])[CH3:2]

Participants

6

Reactant 4

HCID 1140TolueneHCID 10340Sodium CarbonateHCID 27343894-(Trifluoromethyl)phenylboronic acidHCID 110273422-(4-{2-[2-(4-Bromophenyl)-5-methyloxazol-4-yl]ethoxy}phenoxy)-2-methylpropionic acid ethyl ester

Product 1

HCID 698719662-(4-{2-[2-(4'-Trifluoromethylbiphenyl-4-yl)-5-methyloxazol-4-yl]ethoxy}phenoxy)-2-methylpropionic acid ethyl ester

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

To a 25 mL round-bottomed flask equipped for magnetic stirring and fitted with a reflux condenser was added 2-(4-{2-[2-(4-bromophenyl)-5-methyloxazol-4-yl]ethoxy}phenoxy)-2-methyl propionic acid ethyl ester (0.410 mmoles, 200 mg) (see Ex. 2, Part B), 4-trifluoromethylphenyl boronic acid (0.451 mmoles), toluene (5 mL), ethanol (5 mL), and sodium carbonate (0.819 mmoles, 0.410 mL of a 2M solution). This mixture was vacuum degassed and nitrogen was added in at a positive pressure. Pd(PPh3)4 (catalytic, spatula tip) was added and the reaction was heated to reflux for 3 h. Distilled water was added to the mixture. Subsequently, this was extracted with ethyl acetate and washed with brine. The organic layer was collected, filtered over a thin pad of silica gel, and concentrated in-vacuo. The crude mixture was then purified by chromatography on silica gel affording 2-(4-{2-[2-(4′-trifluoromethylbiphenyl-4-yl)-5-methyloxazol-4-yl]ethoxy}phenoxy)-2-methylpropionic acid ethyl ester.

Workup

  1. customTo a 25 mL round-bottomed flask equipped
  2. customfitted with a reflux condenser
  3. customdegassed
  4. additionnitrogen was added in at a positive pressure
  5. additionPd(PPh3)4 (catalytic, spatula tip) was added
  6. temperaturethe reaction was heated
  7. temperatureto reflux for 3 h
  8. additionDistilled water was added to the mixture
  9. extractionSubsequently, this was extracted with ethyl acetate
  10. washwashed with brine
  11. customThe organic layer was collected
  12. filtrationfiltered over a thin pad of silica gel
  13. concentrationconcentrated in-vacuo
  14. customThe crude mixture was then purified by chromatography on silica gel

Sources & evidence

ORD record
ord-a57acff4e29c4de2bad402bf670fec9c
Source dataset
uspto-grants-2003_08
Patent number
US06610696B2

Reaction notes

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