1-Benzyl-2-ethyl-4-methoxy-1H-indole → 1-Benzyl-2-ethyl-1H-indol-4-OL

HRID 1795189Notes

Reaction equation

HRID 1795189 reaction equation
[CH2:1]([C:3]1[N:4]([CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[C:5]2[C:10]([CH:11]=1)=[C:9]([O:12]C)[CH:8]=[CH:7][CH:6]=2)[CH3:2].B(Br)(Br)Br.C(Cl)Cl>>[CH2:1]([C:3]1[N:4]([CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[C:5]2[C:10]([CH:11]=1)=[C:9]([OH:12])[CH:8]=[CH:7][CH:6]=2)[CH3:2]

Participants

3

Reactant 2

HCID 99432411-Benzyl-2-ethyl-4-methoxy-1H-indoleHCID 22277759Boron tribromide dichloromethane

Product 1

HCID 98164161-Benzyl-2-ethyl-1H-indol-4-OLYield 54%

Procedure

3.1 g (11.7 mmol) of 2-ethyl-4-methoxy-1-(phenylmethyl)-1H-indole is O-demethylated by treating it with 48.6 mL of 1M BBr3/CH2Cl2, then stirred at room temperature for 5 hours and concentrated at reduced pressure. The residue is dissolved in ethyl acetate, then washed with brine and dried. The reaction product is then chromatographed on silica gel (eluted with 20% EtOAc/hexane) to give 1.58 g (54% yield) of 2-ethyl-4-hydroxy-1-(phenylmethyl)-1H-indole, mp, 86-90° C.

Workup

  1. concentrationconcentrated at reduced pressure
  2. dissolutionThe residue is dissolved in ethyl acetate
  3. washwashed with brine
  4. customdried
  5. customThe reaction product is then chromatographed on silica gel (eluted with 20% EtOAc/hexane)

Sources & evidence

ORD record
ord-0b6057a2820c41c192d8b260cf8f7b5e
Source dataset
uspto-grants-2006_04
Patent number
US07026348B2

Reaction notes

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