Acetic Acid → 1-{[2-(2-Fluorophenyl)-3-oxo-2,3-dihydropyrazolo[4,3-c]quinolizin-5-yl]methyl}-4-(4-methylpyridin-2-yl)piperidine-4-carbonitrile

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Reaction Steps

2-(2-Fluorophenyl)-3-oxo-2,3-dihydropyrazolo[4,3-c]quinolizine-5-carbaldehyde (0.025 g, 0.081 mmol) was suspended in a mixture of 1,2-dichloroethane (2 mL) and acetonitrile (4 mL) containing powdered 4 Å molecular sieves and treated with 4-(4-methylpyridin-2-yl)piperidine-4-carbonitrile (0.018 g, 0.094 mmol. 1.2 equiv), acetic acid (0.028 mL, 0.49 mmol, 6.0 equiv), and sodium triacetoxyborohydride (0.034 g, 0.16 mmol, 2.0 equiv). After stirring at ambient temperature for 60 hours, the mixture was poured into saturated aqueous sodium bicarbonate and extracted with dichloromethane (2×).

Provenance & Evidence