Boron trifluoride etherate → 4-(2-Butyl-benzofuran-3-ylmethyl)-phenol

HRID 1280939Notes

Reaction equation

HRID 1280939 reaction equation
[CH2:1]([C:5]1[O:6][C:7]2[CH:22]=[CH:21][CH:20]=[CH:19][C:8]=2[C:9]=1[CH:10](O)[C:11]1[CH:16]=[CH:15][C:14]([OH:17])=[CH:13][CH:12]=1)[CH2:2][CH2:3][CH3:4].C([SiH](CC)CC)C.B(F)(F)F.CCOCC>CC#N>[CH2:1]([C:5]1[O:6][C:7]2[CH:22]=[CH:21][CH:20]=[CH:19][C:8]=2[C:9]=1[CH2:10][C:11]1[CH:12]=[CH:13][C:14]([OH:17])=[CH:15][CH:16]=1)[CH2:2][CH2:3][CH3:4]

Participants

5

Reactant 3

HCID 8000Boron trifluoride etherateHCID 12052TriethylsilaneHCID 234456214-[(2-Butyl-benzofuran-3-yl)-hydroxy-methyl]-phenol

Product 1

HCID 234456454-(2-Butyl-benzofuran-3-ylmethyl)-phenolYield 89.3%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

At −10° C., to a stirred solution of 4-[(2-butyl-benzofuran-3-yl)-hydroxy-methyl]-phenol (2.78 g, 9.39 mmol) in CH3CN was added portionwise triethylsilane (two×1.50 mL, 18.78 mmol total, @ 0.5 h interval). To the reaction was added BF3.Et2O (1.19 mL, 9.39 mmol) and the reaction was stirred for 10 min. The reaction was quenched with sat. aq. K2CO3 and extracted with CH2Cl2. The organic extracts were washed with brine (3×), dried (MgSO4) and concentrated. Purification on silica gel gave 2.35 g (89%) the title compound as a white solid, mp 67-70° C. (DMSO-d6) δ 0.87 (t, 3H), 1.31 (sextet, 2H), 1.62 (quintet, 2H), 2.78 (t, 2H), 3.84 (s, 2H), 6.64 (d, 2H), 7.02 (d, 2H), 7.09 (dt, 1H), 7.16 (dt, 1H), 7.31 (d, 1H), 7.42 (d, 1H), 9.16 (s, 1H). IR (KBr) 3300, 2950, 1610, 1510 and 1450 cm−1. mass spectrum (EI) m/z 280 (M+

Workup

  1. customThe reaction was quenched with sat. aq. K2CO3
  2. extractionextracted with CH2Cl2
  3. washThe organic extracts were washed with brine (3×)
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated
  6. customPurification on silica gel

Sources & evidence

ORD record
ord-e0a0024563964001b8154d7bff72adf0
Source dataset
uspto-grants-2002_09
Patent number
US06451845B1

Reaction notes

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