Dimethylformamide → HCID 89783710, compound

Participants

Reaction Steps

To ethyl 4-bromo-3-methyl-1H-pyrazole-5-carboxylate (2.56 g, 10.98 mmol) in DMF (30 mL) were added Cs2CO3 (8.94 g, 27.4 mmol) and 4-(chloromethyl)-1-methyl-1H-pyrazole, HCl (2.2 g, 13.17 mmol). The reaction mixture was stirred at room temperature for 20 hours and then diluted with water. The product was extracted into EtOAc. The organic phase was dried over Na2SO4 and concentrated. The crude residue was purified by CombiFlash® chromatography (120 g, column) eluting with a gradient of 10-100% EtOAc in heptane over a period of 180 minutes. The product-containing fractions were combined and concentrated to give the title compound (0.82 g, 23%) and a regioisomer, ethyl 4-bromo-5-methyl-1-((1-methyl-1H-pyrazol-4-yl)methyl)-1H-pyrazole-3-carboxylate (1.32 g, 36.8%).

Provenance & Evidence