反应详情

温度

100 °C

Manganese dioxide (6.94 g, 79.9 mmol) was added portionwise to a stirred solution of [2-(5-hydroxymethyl-3-phenoxymethyl-pyrazol-1-yl)-ethyl]-carbamic acid tert-butyl ester (2.5 g, 5.33 mmol) in 1,4-dioxane (45 mL). The mixture was stirred at 100° C. for 16 hours and then filtered through a pad of diatomaceous earth. The solvents were evaporated in vacuo and the crude product was purified by flash column chromatography (silica; AcOEt in heptane 0/100 to 50/50). The desired fractions were collected and the solvents were evaporated in vacuo to yield [2-(5-formyl-3-phenoxymethyl-pyrazol-1-yl)-ethyl]-carbamic acid tert-butyl ester (0.81 g, 44% yield) as a yellow solid.

1. filtrationfiltered through a pad of diatomaceous earth
2. customThe solvents were evaporated in vacuo
3. customthe crude product was purified by flash column chromatography (silica; AcOEt in heptane 0/100 to 50/50)
4. customThe desired fractions were collected
5. customthe solvents were evaporated in vacuo