Water → 4-bromo-1-((2,2-dimethyl-1,3-dioxolan-4-yl)methyl)-1H-pyrazole

関与物質

反応条件

反応手順

Cs2CO3 (5.3 g, 16.3 mmol) was added to a solution of 4-bromo-1H-pyrazole (2 g, 13.6 mmol) in DMF (10 mL), followed by 4-(chloromethyl)-2,2-dimethyl-1,3-dioxolane (2.46 g, 16.3 mmol) and the resulting mixture heated to an internal temperature of 65° C. After stirring for 14 h, water and EtOAc was added and the layers separated. The organic layer was washed a second time with water, dried with over anhydorus magnesium sulfate, filtered and concentrated under reduced pressure. The resulting crude residue was absorbed on silica gel and purified by column chromatography on silica (0 to 100% EtOAc/Hex) to afford 4-bromo-1-((2,2-dimethyl-1,3-dioxolan-4-yl)methyl)-1H-pyrazole as a light yellow oil, MS ESI calcd. for C9H14BrN2O2 [M+H]+ 261. found 261.

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