Hydrogen Peroxide → 2-(5-Methoxy-1H-indol-3-yl)-1H-pyrrolo[2,3-b]pyridine-4 Carboxamide

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Reaction Steps

A suspension of 2-(5-methoxy-1H-indol-3-yl)-1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridine-4 carbonitrile [0.25 g, Reference Example 67(e)] in methanol (25 mL) was treated with sodium hydroxide solution (1.5 g in 4 mL water). The mixture was cooled in an ice-bath and then treated dropwise with hydrogen peroxide (0.35 mL, 30%). After stirring at room temperature for 1 hour a further aliquot of hydrogen peroxide (0.3 mL) was added to the reaction mixture and stirring was continued for a further 3 hours then the reaction was quenched by addition of sodium metabisulfite to remove excess hydrogen peroxide. The reaction mixture was then diluted with water (75 mL) and extracted twice with ethyl acetate (50 mL). The combined extracts were washed twice with brine (30 mL), then dried over sodium sulfate and then evaporated. The residual yellow solid was subjected to chromatography on silica eluting with a mixture of ethyl acetate and dichloromethane (1:1, v/v) to give, after trituration with methanol and washing with diethyl ether, the title compound (50 mg) as a yellow solid, m.p.>320° C. MS: 307 (MH+).

Provenance & Evidence