N,N'-Dimethylethylenediamine → N-(3-chloro-1-(pyridin-3-yl)-1H-pyrazol-4-yl)acetamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A 4-neck round bottom flask was charged with N,N-dimethylformamide (250 mL) and then degassed 2-3 times. Copper(I) iodide (17.9 g, 94.0 mmol) was added, followed by N,N′-dimethylethane-1,2-diamine (16.2 g, 188 mmol) at 25-30° C. The mixture was purged with nitrogen for 30 minutes. 3-Bromopyridine (59.4 g, 376 mmol) was added, followed by N-(3-chloro-1H-pyrazol-4-yl)acetamide (50.0 g, 313 mmol) and potassium carbonate (87.0 g, 188 mmol) at 25-30° C. The reaction mixture was purged with nitrogen for 30 minutes and heated at 95-100° C. for 3 hours, at which point HPLC analysis indicated that the reaction was complete. It was cooled to 25-30° C. and water (1 L) was added over 30-45 minutes. The resulting suspension was stirred at 25-30° C. for 30 minutes and cooled to 0-10° C. It was stirred for 12 hours at 0-10° C. and then filtered. The filter cake was rinsed with water (2×250 mL) and dried to afford an off-white solid (55 g, 74%). Characterization matched sample prepared by previous method.

Herkunft & Nachweise