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

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A 100-mL, 3-neck round bottom flask was charged with copper(I) chloride (59.6 mg, 0.602 mmol) and acetonitrile (10 mL), N,N′-dimethyethane-1,2-diamine (106 mg, 1.203 mmol) was added and the mixture was stirred under nitrogen to afford a solution. N-(3-Chloro-1H-pyrazol-4-yl)acetamide (480 mg, 3.01 mmol) and potassium carbonate (831 mg, 6.02 mmol) were added, followed by 3-bromopyridine (570 mg, 3.61 mmol). The mixture was purged with nitrogen three times and heated at 80° C. for 18 hours. Thin layer chromatography analysis [Eluent: ethyl acetate, SM Rf=0.5, Product Rf=0.3] indicated that a trace of starting material remained and a major product formed. It was filtered through a pad of Celite® and the Celite® pad rinsed with acetonitrile (10 mL). The combined filtrates were concentrated to about 5 mL and water (10 mL) was added to the resulting suspension. The suspension was stirred for 1 hour and filtered. The solid was rinsed with water (2×5 mL) and dried under vacuum at room temperature to afford a white solid (458 mg, 64%). Characterization matched sample prepared by previous method.

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