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

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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+).

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