Piperidine → 4-(1H-Indazol-5-yl)-2-methyl-5-oxo-4,5,6,7-tetrahydro-1H-cyclopenta[b]pyridine-3-carbonitrile

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Reaction Steps

100 mg (1.026 mmol) cyclopentane-1,3-dione, 150 mg (1.026 mmol) 1H-indazole-5-carbaldehyde and piperidine (0.1 ml) in ethanol (8 ml) were heated to reflux for 4 h. The mixture was then evaporated to dryness, the remaining solid was dissolved in acetic acid (8 ml), and 84 mg (1.026 mmol) 3-aminobut-2-enenitrile were added. The solution was heated to reflux for 2 h. After cooling, the mixture was evaporated to dryness again, and the remaining solid was purified by preparative RP-HPLC (acetonitrile/water gradient) to yield 40 mg (13% of th.) of the title compound.

Provenance & Evidence