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

HRID 1042587Notes

Reaction equation

HRID 1042587 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-benzofuran

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 (tlc), diluted with ethyl acetate (10 mL) and washed with 1M hydrochloric acid (5 mL). The organic layer was dried over magnesium sulphate 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 creamy 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 sulphate
  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-1f207c77bfa049ad85376756813c4f4f
Source dataset
uspto-grants-2013_10
Patent number
US08557982B2

Reaction notes

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