Cesium carbonate → 2-Methyl-3-(4-{2-[5-methyl-2-(3-thiophen-3-ylphenyl)oxazol-4-yl]ethoxy}phenyl)-2-phenoxypropionic acid ethyl ester

HRID 348283Notes

Reaction equation

HRID 348283 reaction equation
[CH2:1]([O:3][C:4](=[O:22])[C:5]([CH3:21])([O:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)[CH2:6][C:7]1[CH:12]=[CH:11][C:10]([OH:13])=[CH:9][CH:8]=1)[CH3:2].[CH3:23][C:24]1[O:28][C:27]([C:29]2[CH:34]=[CH:33][CH:32]=[C:31]([C:35]3[CH:39]=[CH:38][S:37][CH:36]=3)[CH:30]=2)=[N:26][C:25]=1[CH2:40][CH2:41]OS(C1C=CC(C)=CC=1)(=O)=O.C([O-])([O-])=O.[Cs+].[Cs+]>CN(C=O)C.C(OCC)(=O)C>[CH2:1]([O:3][C:4](=[O:22])[C:5]([CH3:21])([O:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)[CH2:6][C:7]1[CH:12]=[CH:11][C:10]([O:13][CH2:41][CH2:40][C:25]2[N:26]=[C:27]([C:29]3[CH:34]=[CH:33][CH:32]=[C:31]([C:35]4[CH:39]=[CH:38][S:37][CH:36]=4)[CH:30]=3)[O:28][C:24]=2[CH3:23])=[CH:9][CH:8]=1)[CH3:2]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 11220314Ethyl 3-(4-hydroxyphenyl)-2-methyl-2-phenoxypropionateHCID 86593518HCID 86593518, compound

Product 1

HCID 693540362-Methyl-3-(4-{2-[5-methyl-2-(3-thiophen-3-ylphenyl)oxazol-4-yl]ethoxy}phenyl)-2-phenoxypropionic acid ethyl ester

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
55 °C

Procedure

3-(4-Hydroxyphenyl)-2-methyl-2-phenoxypropionic acid ethyl ester (495 mg, 1.7 mmol) (see Ex. 1, Part C), toluene-4-sulfonic acid 2-[5-methyl-2-(3-thiophen-3-ylphenyl)oxazol-4-yl]ethyl ester (2.2 mmol) and Cs2CO3 (700 mg, 2.2 mmol) are combined in anhydrous DMF (25 mL) and stirred for 16 h at 55° C. under an atmosphere of nitrogen. The mixture was then cooled and diluted with ethyl acetate (100 mL), and washed with water then brine. The organic layer was dried with Na2SO4 and concentrated in vacuo to a viscous yellow oil. The residue was purified by flash column chromatography (100 g silica, 60×15 mL fractions, gradient elution 0–20% ethyl acetate in hexanes) to provide the title compound as a colorless oil. 1H NMR (400 MHz, CDCl3) δ 8.23 (s, 1H), 7.90 (dt, J=7.6 Hz, J=1.2 Hz, 1H), 7.64 (dt, J=7.6 Hz, J=1.2 Hz, 1H), 7.56–7.55 (m, 1H), 7.48–7.39 (m, 3H), 7.23–7.14 (m, 5H), 6.96 (t, J=7.2 Hz, 1H), 6.83–6.81 (m, 4H), 4.24 (t, J=6.8 Hz, 2H), 4.12 (q, J=7.2 Hz, 2H), 3.26 (d, J=14.0 Hz, 1H), 3.10 (d, J=14.0 Hz, 1H), 3.00 (t, J=6.4 Hz, 2H), 2.39 (s, 3H), 1.38 (s, 3H) 1.21 (t, J=7.2 Hz, 3H); MS (EI) 568.2 (M+H)+.

Workup

  1. temperatureThe mixture was then cooled
  2. washwashed with water
  3. dry with materialThe organic layer was dried with Na2SO4
  4. concentrationconcentrated in vacuo to a viscous yellow oil
  5. customThe residue was purified by flash column chromatography (100 g silica, 60×15 mL fractions, gradient elution 0–20% ethyl acetate in hexanes)

Sources & evidence

ORD record
ord-a989098b8b7445248a99d08c8c56b524
Source dataset
uspto-grants-2007_02
Patent number
US07176224B2

Reaction notes

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