[CH3:1][O:2][C:3]1[C:11]([CH3:12])=[CH:10][CH:9]=[C:8]2[C:4]=1[CH:5]=[C:6]([C:13]([NH2:15])=O)[NH:7]2.P(Cl)(Cl)(Cl)=O.C(Cl)(Cl)Cl>O>[CH3:1][O:2][C:3]1[C:11]([CH3:12])=[CH:10][CH:9]=[C:8]2[C:4]=1[CH:5]=[C:6]([C:13]#[N:15])[NH:7]2A mixture of 79 mg of 4-methoxy-5-methyl-1H-indole-2-carboxamide (0.39 mmol), 0.19 mL of phosphorus oxychloride (2 mmol) and 1.5 mL of chloroform was refluxed for 2 hs. Then cooled solution was poured into 10 mL of water and stirred for 1 hr. After separation the organic layer was dried over sodium sulfate and concentrated. The residue was purified on silica gel column using hexane-ethyl acetate 5:1 to afford 51 mg of 4-methoxy-5-methyl-1H-indole-2-carbonitrile.
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