Cesium carbonate → 2-(5-Benzyloxy-2-but-1-enylphenoxy)-2-methylpropionic Acid Ethyl Ester

HRID 898475Notes

Reaction equation

[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12]([CH:16]=[CH:17][CH2:18][CH3:19])=[C:13]([OH:15])[CH:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Br[C:21]([CH3:28])([CH3:27])[C:22]([O:24][CH2:25][CH3:26])=[O:23].C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C>[CH2:25]([O:24][C:22](=[O:23])[C:21]([O:15][C:13]1[CH:14]=[C:9]([O:8][CH2:1][C:2]2[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=2)[CH:10]=[CH:11][C:12]=1[CH:16]=[CH:17][CH2:18][CH3:19])([CH3:28])[CH3:27])[CH3:26]

Participants

Conditions

Temperature: 55 °C

Procedure

5-Benzyloxy-2-but-1-enylphenol (0.70 g, 2.75 mmol) was dissolved in anhydrous DMF (12 mL), followed by the addition of ethyl bromoisobutyrate (1.62 mL, 11.0 mmol), and cesium carbonate (3.58 g, 11.0 mmol). The mixture was then heated for 18 h (55° C.). The reaction mixture was then cooled and concentrated in vacuo. The crude residue was partitioned between EtOAc (70 mL) and water (40 mL). The organic layer was washed with brine, dried (Na2SO4), and removed in vacuo. The crude residue was purified using radial chromatography, eluting with 5% EtOAc/Hex to give 0.77 g (76%) of a colorless oil. 1H NMR (400 MHz, CDCl3) δ 7.41-7.28 (m, 6H), 6.65-6.59 (m, 2H), 6.40 (d, J=2.4 Hz, 1H), 6.14-6.07 (m, 1H), 4.99 (s, 2H), 4.22 (q, J=7.2 Hz, 2H), 2.22 (quintet, J=7.6 Hz, 2H), 1.56 (s, 6H), 1.26 (t, J=7.1 Hz, 3H), 1.08 (t, J=7.6 Hz, 3H), MS (ES) m/e 369 (M+1).

Workup

temperatureThe reaction mixture was then cooled
concentrationconcentrated in vacuo
customThe crude residue was partitioned between EtOAc (70 mL) and water (40 mL)
washThe organic layer was washed with brine
dry with materialdried (Na2SO4)
customremoved in vacuo
customThe crude residue was purified
washeluting with 5% EtOAc/Hex

Sources & evidence

ORD record: ord-68f65378b8ff496ab3bb676e3e71c0ca
Source dataset: uspto-grants-2008_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07351728B2

Reaction notes

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