Cesium carbonate → 4-(4-(benzyloxy)phenyl)-5-(4-methoxyphenyl)-2,2-dimethylfuran-3(2H)-one

HRID 1842386Notes

Reaction equation

HRID 1842386 reaction equation
Br[C:2]1[C:3](=[O:17])[C:4]([CH3:16])([CH3:15])[O:5][C:6]=1[C:7]1[CH:12]=[CH:11][C:10]([O:13][CH3:14])=[CH:9][CH:8]=1.[CH2:18]([O:25][C:26]1[CH:31]=[CH:30][C:29](B2OC(C)(C)C(C)(C)O2)=[CH:28][CH:27]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.C([O-])([O-])=O.[Cs+].[Cs+]>C1(C)C=CC=CC=1.O.[Pd]>[CH2:18]([O:25][C:26]1[CH:31]=[CH:30][C:29]([C:2]2[C:3](=[O:17])[C:4]([CH3:16])([CH3:15])[O:5][C:6]=2[C:7]2[CH:12]=[CH:11][C:10]([O:13][CH3:14])=[CH:9][CH:8]=2)=[CH:28][CH:27]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 50574272-[4-(Benzyloxy)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolaneHCID 593547994-bromo-5-(4-methoxyphenyl)-2,2-dimethylfuran-3(2H)-one

Product 1

HCID 595801374-(4-(benzyloxy)phenyl)-5-(4-methoxyphenyl)-2,2-dimethylfuran-3(2H)-oneYield 85.7%

Reagents, catalysts & solvents 3

HCID 23938PalladiumCatalystHCID 962WaterSolventHCID 1140TolueneSolvent

Procedure

4-Bromo-5-(4-methoxyphenyl)-2,2-dimethylfuran-3(2H)-one (2 g, 6.7 mol), 2-(4-(benzyloxy)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (2.43 g, 0.0067 mol), and Cs2CO3 (11 g, 0.034 mol) in toluene (25 mL) and water (8 mL) was degassed, Pd (dppf) Cl2 (1.1 g, 0.0013 mol) was added under an inert atmosphere and the mixture degassed once again. The reaction was heated at reflux for 3 h, upon which the reaction mixture was filtered through a pad of Celite® and the filtrate was diluted with EtOAc (100 mL), washed with water (50 mL), brine (50 mL), dried over Na2SO4, filtered and concentrated in vacuo to obtain the crude product. The crude material was purified by flash column chromatography using 30% ethyl acetate in hexane and silica gel (230-400 Mesh), Rf=0.30 to afford 4-(4-(benzyloxy)phenyl)-5-(4-methoxyphenyl)-2,2-dimethylfuran-3(2H)-one (2.3 g, 73%) as solid. 1H NMR (500 MHz, d6-DMSO): δ 8.42 (d, J=7.6 Hz, 1H), 8.06-7.99 (m, 2H), 7.95 (t, J=7.2 Hz, 1H), 7.72 (t, J=7.2 Hz, 1H), 7.63 (t, J=7.8 Hz, 1H), 7.56 (d, J=7.2 Hz, 2H); 7.18 (d, J=7.4 Hz, 2H), 7.12 (d, J=7.2 Hz, 2H), 6.89 (d, J=7.2 Hz, 2H), 5.38 (s, 2H), 3.79 (s, 3H). 1.42 (s, 6H). MS: [M+H]+: m/z=452.1; [M+Na]+: m/z=474.2.

Workup

  1. customthe mixture degassed once again
  2. temperatureThe reaction was heated
  3. temperatureat reflux for 3 h, upon which the reaction mixture
  4. filtrationwas filtered through a pad of Celite®
  5. additionthe filtrate was diluted with EtOAc (100 mL)
  6. washwashed with water (50 mL), brine (50 mL)
  7. dry with materialdried over Na2SO4
  8. filtrationfiltered
  9. concentrationconcentrated in vacuo
  10. customto obtain the crude product
  11. customThe crude material was purified by flash column chromatography

Sources & evidence

ORD record
ord-64ac87aeeaf54e34a6b2df6c1f4b5911
Source dataset
uspto-grants-2015_02
Patent number
US08946222B2

Reaction notes

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