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

HRID 348281Notes

Reaction equation

HRID 348281 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[S:36][CH:37]=[CH:38][CH:39]=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[S:36][CH:37]=[CH:38][CH:39]=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 86593517Toluene-4-sulfonic acid 2-[5-methyl-2-(3-thiophen-2-ylphenyl)oxazol-4-yl]ethyl ester

Product 1

HCID 693540532-Methyl-3-(4-{2-[5-methyl-2-(3-thiophen-2-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-2-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 (d, J=7.6 Hz, 1H), 7.65 (d, J=7.6 Hz, 1H), 7.44 (t, J=8.0 Hz, 1H), 7.42–7.41 (m, 1H), 7.31 (d, J=5.2 Hz, 1H), 7.23–7.09 (m, 5H), 6.96 (t, J=7.2 Hz, 1H), 6.85–6.81 (m, 4H), 4.25 (t, J=6.8 Hz, 2H), 7.20 (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=6.8 Hz, 2.40 (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-5dd5977e3ce04e34a0c5330029283060
Source dataset
uspto-grants-2007_02
Patent number
US07176224B2

Reaction notes

Loading…