Dimethylformamide → tert-Butyl 2-(3-(2,5-Dimethyl-1H-pyrrol-1-yl)-5-(methoxy(methyl)carbamoyl)-1H-pyrazol-1-yl)ethylcarbamate

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A 250-mL round-bottomed flask equipped with a magnetic stirrer was charged with 287c (10.4 g, 1.0 eq., 41.9 mmol), tert-butyl 2-chloroethylcarbamate (37.7 g, 5.0 eq., 210.0 mmol), Na2CO3 (22.3 g, 5.0 eq., 210.0 mmol), and DMF (100 mL). The reaction mixture was stirred at 110° C. overnight. After cooling to room temperature, the resulting mixture was poured into water (200 mL) and extracted with ethyl acetate (3×100 mL). The combined organic layer was concentrated under reduced pressure. The resulting residue was purified by silica-gel column chromatography eluting with ethyl acetate to afford 287d (10.8 g, 66%) as yellow oil. MS-ESI: [M+H]+ 392.0

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