Pyridine → 3-[3-(1-[2-(trimethylsilyl)ethoxy]methyl-1H-pyrrolo[2,3-b]pyridin-4-yl)-1,2,4-oxadiazol-5-yl]benzonitrile

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The crude product N-hydroxy-1-[2-(trimethylsilyl)ethoxy]methyl-1H-pyrrolo[2,3-b]pyridine-4-carboximidamide (0.06 gm, 0.0002 mol) was dissolved in pyridine (1.0 mL, 0.012 mol) and then 3-cyanobenzoyl chloride (0.040 g, 0.00024 mol) was added at rt. This mixture was stirred for 1 h and heated to 80° C. in an oil bath. After heating for 18 h the reaction was allowed to cool to rt and then diluted with ACN and concentrated in vacuo to give 3-[3-(1-[2-(trimethylsilyl)ethoxy]methyl-1H-pyrrolo[2,3-b]pyridin-4-yl)-1,2,4-oxadiazol-5-yl]benzonitrile 0.08 gm as an off white residue, LC/MS (M+H)+ 418.

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