Ammonium Chloride → 2-(5-fluoro-2,3-dimethyl-1H-pyrrolo[2,3-c]pyridin-7-yl)-1,2,3,4-tetrahydroisoquinoline

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Reaction Steps

1-Methyl-1-propenyl magnesium bromide (0.5M in tetrahydrofuran solution; 138 ml, 68.9 mmol) was slowly added at −78° C. to a solution of 2-(6-fluoro-3-nitropyridin-2-yl)-1,2,3,4-tetrahydroisoquinoline (5.38 g, 19.7 mmol) prepared in Step 2 in anhydrous tetrahydrofuran (150 ml). The reaction mixture was stirred for 1 hour at the same temperature, slowly warmed to room temperature, and then stirred overnight. 20% (w/v) Ammonium chloride solution was added to the reaction mixture, which was then extracted with ethyl acetate. The resulting organic layer was dried on anhydrous magnesium sulfate and then filtered. The resulting filtrate was concentrated under reduced pressure. The resulting residue was purified with silica gel column chromatography. The resulting product was crystallized with ethyl ether to give the titled compound as red oil. (Yield: 32%)

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