Boron tribromide → 2-(6-Hydroxy-2-naphthyl)-3-pentyl-1H-indole

HRID 898291Notes

Reaction equation

HRID 898291 reaction equation
C[O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[CH:9]=[C:8]([C:13]1[NH:14][C:15]3[C:20]([C:21]=1[CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])=[CH:19][CH:18]=[CH:17][CH:16]=3)[CH:7]=[CH:6]2.B(Br)(Br)Br>C(Cl)Cl>[OH:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[CH:9]=[C:8]([C:13]1[NH:14][C:15]3[C:20]([C:21]=1[CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])=[CH:19][CH:18]=[CH:17][CH:16]=3)[CH:7]=[CH:6]2

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 223273422-(6-methoxy-2-naphthyl)-3-pentyl-1H-indole

Product 1

HCID 223273352-(6-Hydroxy-2-naphthyl)-3-pentyl-1H-indoleYield 77.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of 2-(6-methoxy-2-naphthyl)-3-pentyl-1H-indole (0.915 g, 2.66 mmol) in CH2Cl2 (30 mL) cooled to −78° C. was added BBr3 (9.86 mL, 1.0 M in CH2Cl2, 9.86 mmol) dropwise. The reaction was stirred at this temperature for 0.5 h and then warmed to rt for 2 h. The reaction mixture was quenched with MeOH (˜5 mL) followed by dilution with H2O (20 mL) and EtOAc (200 mL). The organic layer was washed with brine (20 mL) and then dried (Na2SO4). After concentration, the residue was purified by the Biotage Flash 40 apparatus (10 to 20% EtOAc:petroleum ether gradient) to afford the product (0.677 g, 77%) as a foamy solid; 1H NMR (DMSO-d6) δ 0.83 (t, J=7.3 Hz, 3H), 1.23-1.42 (m, 4H), 1.58-1.76 (m, 2H), 2.89 (t, J=8.2 Hz, 2H), 7.00 (t, J=8.2 Hz, 1H), 7.06-7.19 (m, 3H), 7.35 (d, J=8.2 Hz, 1H), 7.53 (d, J=8.2, 1H), 7.67 (d, J=9.1 Hz, 1H), 7.74-7.88 (m, 2H), 7.98 (s, 1H), 9.83 (s, 1H), 11.14 (s, 1H); mass spectrum [(+) ESI], m/z 330 (M+H)+ and [(−) ESI], m/z 328 (M−H)−.

Workup

  1. customThe reaction mixture was quenched with MeOH (˜5 mL)
  2. washThe organic layer was washed with brine (20 mL)
  3. dry with materialdried (Na2SO4)
  4. concentrationAfter concentration
  5. customthe residue was purified by the Biotage Flash 40 apparatus (10 to 20% EtOAc:petroleum ether gradient)

Sources & evidence

ORD record
ord-00e5faade9ec4c01b765269e2c965621
Source dataset
uspto-grants-2008_04
Patent number
US07351730B2

Reaction notes

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