Potassium Carbonate → 6-chloro-N-methyl-1-trityl-1H-pyrazolo[4,3-c]pyridin-3-amine

Participants

Reaction Steps

6-Chloro-3-iodo-1-trityl-1H-pyrazolo[4,3-c]pyridine (Intermediate 1C; 6.08 g, 11.65 mmol), proline (0.42 g, 3.65 mmol), copper(I) iodide (0.24 g, 1.260 mmol), potassium carbonate (9.83 g, 71.1 mmol), and methylamine hydrochloride (3.26 g, 48.3 mmol) were stirred in DMSO (45 mL) at 70° C. for 24 h. Room temperature was attained, ammonium hydroxide was added, and the products extracted into DCM (×2). The combined organic extracts were washed with brine, dried over MgSO4, filtered, and concentrated in vacuo. Purification of the residue by flash chromatography (6-50% EtOAc-hexanes) gave 6-chloro-N-methyl-1-trityl-1H-pyrazolo[4,3-c]pyridin-3-amine MS ESI calc'd. For C26H21ClN4 [M+1]+ 425. found 425.

Provenance & Evidence