1,10-Phenanthroline → 1-(3-Chloro-phenyl)-3-methanesulfonyl-6-[4-(2-oxo-piperidin-1-yl)-phenyl]-1,4,5,6-tetrahydro-pyrazolo[3,4-c]pyridin-7-one

Participants

Reaction Conditions

Reaction Steps

Part B. In a round bottomed flask were combined 1-(3-chloro-phenyl)-6-(4-iodo-phenyl)-3-methanesulfonyl-1,4,5,6-tetrahydro-pyrazolo[3,4-c]pyridin-7-one (1.00 g, 1.89 mmol), δ-valerolactam (0.36 g, 3.79 mmol), anhydrous powdered potassium carbonate (1.05 g, 7.58 mmol), cuprous iodide (0.072 g, 0.38 mmol), and 1,10-phenanthroline (0.068 g, 0.38 mmol). The flask was purge with argon and degassed methylsulfoxide (10 mL) was added before heating to 120° C. Upon completion of the reaction, as judged by TLC or LC/MS, the reaction was cooled to ambient temperature and 50 mL each of 3M ammonium hydroxide and dichloromethane were added. The phases were separated and the aqueous extracted with an additional 30 mL of dichloromethane. The combined dichloromethane extracts are washed successively four times with water and once with brine. The solution was dried over sodium sulfate, filtered, and evaporated to give an oil that was purified by flash column chromatography eluting with ethylacetate to give 0.424 g (45%) of 1-(3-chloro-phenyl)-3-methanesulfonyl-6-[4-(2-oxo-piperidin-1-yl)-phenyl]-1,4,5,6-tetrahydro-pyrazolo[3,4-c]pyridin-7-one as a colorless solid. The material may be recrystallized from acetonitrile. 1H NMR (DMSO-d6) δ 7.79 (t, 1H, J=2 Hz), 7.63–7.49 (m, 3H), 7.32 (ab q, 4H, J=21, 9 Hz), 4.10 (t, 2H, J=6 Hz), 3.58 (t, 2H, J=5 Hz), 3.36 (s, 3H), 3.19 (t, 2H, J=6 Hz), 2.37 (t, 2H, J=5 Hz), 1.83 (m, 4H). LC/MS (ES+): 498.9/500.9 (C1 pattern) (>95% pure by ELSD).

Provenance & Evidence