Tetrabutylammonium Fluoride → 3-(3,4,5-Trimethoxybenzoyl)-6-methoxy-benzofuran

HRID 1191984Notes

Reaction equation

HRID 1191984 reaction equation
[Si]([C:8]1[O:9][C:10]2[CH:30]=[C:29]([O:31][CH3:32])[CH:28]=[CH:27][C:11]=2[C:12]=1[C:13](=[O:26])[C:14]1[CH:19]=[C:18]([O:20][CH3:21])[C:17]([O:22][CH3:23])=[C:16]([O:24][CH3:25])[CH:15]=1)(C(C)(C)C)(C)C.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>O1CCCC1.C(OCC)(=O)C>[CH3:25][O:24][C:16]1[CH:15]=[C:14]([CH:19]=[C:18]([O:20][CH3:21])[C:17]=1[O:22][CH3:23])[C:13]([C:12]1[C:11]2[CH:27]=[CH:28][C:29]([O:31][CH3:32])=[CH:30][C:10]=2[O:9][CH:8]=1)=[O:26]

Participants

5

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 247872412-t-Butyldimethylsilyl-3-(3,4,5-trimethoxybenzoyl)-6-methoxy-benzofuran

Product 1

HCID 247866663-(3,4,5-Trimethoxybenzoyl)-6-methoxy-benzofuranYield 86%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a stirred solution of 2-t-butyldimethylsilyl-3-(3,4,5-trimethoxy-benzoyl)-6-methoxy-benzofuran (30 mg, 0.066 mmol) in tetrahydrofuran (1 mL) was added tetrabutylammoniumfluoride (76.5 μL, 0.076 mmol, 1M solution in tetrahydrofuran). The reaction mixture was stirred at room temperature for 20 minutes (monitored by tlc), diluted with ethyl acetate (10 mL) and washed with 1M hydrochloric acid (5 mL). The organic layer was dried over magnesium sulfate and the solvent was removed under vacuum. The crude product was purified by flash chromatography (silica gel, eluent=hexane/diethyl ether; 7:3) to afford the title product as a cream crystalline solid (19.3 mg, 86%); 1H NMR (300 MHz, CDCl3) δ 8.02 (d, 1H, J=8.97 Hz), 8.01 (s, 1H, C2H), 7.14 (s, 2H, benzoyl Hs), 7.05 (d, 1H, J=2.11 Hz), 7.00 (dd, 1H, J=8.63, 2.11 Hz), 3.93 (s, 3H, OMe), 3.90 (s, 6H, 2×OMe), 3.87 (s, 3H, OMe); 13C NMR (75 MHz, CDCl3) δ 188.71 (CO), 158.64, 156.31, 152.82, 150.22, 141.72, 133.97, 122.58, 120.87, 118.12, 113.11, 106.07, 95.53, 60.63, 55.99, 55.40.

Workup

  1. washwashed with 1M hydrochloric acid (5 mL)
  2. dry with materialThe organic layer was dried over magnesium sulfate
  3. customthe solvent was removed under vacuum
  4. customThe crude product was purified by flash chromatography (silica gel, eluent=hexane/diethyl ether; 7:3)

Sources & evidence

ORD record
ord-0b2193a99dcd464082dee7d88592ca2e
Source dataset
uspto-grants-2014_03
Patent number
US08680135B2

Reaction notes

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