Hydrogen Bromide → 1-Methyl-3-(5H-pyrrolo[2,3-b]pyrazin-6-yl)-1H-indol-5-ol

HRID 549004

Reaction equation

HRID 549004 reaction equation
C[O:2][C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][CH:11]=1)[N:8]([CH3:12])[CH:7]=[C:6]2[C:13]1[NH:21][C:16]2=[N:17][CH:18]=[CH:19][N:20]=[C:15]2[CH:14]=1.Br.C(=O)(O)[O-].[Na+]>C(O)(=O)C>[CH3:12][N:8]1[C:9]2[C:5](=[CH:4][C:3]([OH:2])=[CH:11][CH:10]=2)[C:6]([C:13]2[NH:21][C:16]3=[N:17][CH:18]=[CH:19][N:20]=[C:15]3[CH:14]=2)=[CH:7]1

Participants

5

Reactant 3

HCID 260Hydrogen BromideHCID 516892Sodium BicarbonateHCID 98604486-(5-methoxy-1-methyl-1H-indol-3-yl)-5H-pyrrolo[2,3-b]pyrazine

Product 1

HCID 224772321-Methyl-3-(5H-pyrrolo[2,3-b]pyrazin-6-yl)-1H-indol-5-olYield 94.8%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

A mixture of 6-(5-methoxy-1-methyl-1H-indol-3-yl)-5H-pyrrolo[2,3-b]pyrazine [200 mg, Example 1(a)] hydrobromic acid (48%, 500 μl) and glacial acetic acid (3 mL) was heated under reflux for 14 hours. After cooling the mixture was neutralised by addition of saturated sodium bicarbonate solution. The resulting dark solid was filtered and then dried to give the title compound (180 mg) as a black solid, m.p. 289-290° C. MS: 264 (MH+).

Workup

  1. temperaturewas heated
  2. temperatureunder reflux for 14 hours
  3. temperatureAfter cooling the mixture
  4. filtrationThe resulting dark solid was filtered
  5. customdried

Sources & evidence

ORD record
ord-bdec31d1594a40d0a02e007ce908d90c
Source dataset
uspto-grants-2011_05
Patent number
US07943616B2

Linked notes

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