Acetone → 1-phenyl-2-[5-(toluene-4-sulfonyl)-2-(3,4,5-trimethoxy-phenyl)-5H-pyrrolo[2,3-b]pyrazin-7-yl]-ethanone

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7-Phenylethynyl-5-(toluene-4-sulfonyl)-2-(3,4,5-trimethoxy-phenyl)-5H-pyrrolo[2,3-b]pyrazine (154 mg, 0.29 mmol), mercury(II) sulfate (127 mg, 0.43 mmol), concentrated sulfuric acid (0.031 ml, 0.58 mmol) and 3 ml of a 3:1 mixture of acetone and water were added to a 5 ml microwave vial. The reaction was heated in a microwave reactor at 110° C. for one hour. The solvent was evaporated and ethyl acetate and aqueous sodium carbonate were added to the residue. The aqueous layer was removed using a reparatory funnel, the organic layer was washed with water twice, then dried and concentrated. The residue was purified by flash chromatography using a gradient of 0% ethyl acetate in hexanes up to 30% to give 100 mg of 1-phenyl-2-[5-(toluene-4-sulfonyl)-2-(3,4,5-trimethoxy-phenyl)-5H-pyrrolo[2,3-b]pyrazin-7-yl]-ethanone as the major product. MS: (M+H)+=558.

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