反应详情

To a solution of 2,4,6-trichloro-pyrimidin-5-ol (250 mg, 1.25 mmol), cyclopropyl-hydroxy-acetic acid methyl ester (245 mg, 1.88 mmol) and triphenylphosphine (493 mg, 1.88 mmol) in THF (12 mL) was added DIAD (370 μL, 1.88 mmol) dropwise. The resultant suspension was stirred for 18 hours before the addition of dioxane (10 mL) and the reaction stirred for a further 6 hours. The heterogeneous mixture was concentrated in vacuo and the resultant residue was purified by column chromatography (SiO2, gradient 0-30% ethyl acetate in cyclohexane) affording Cyclopropyl-(2,4,6-trichloro-pyrimidin-5-yloxy)-acetic acid methyl ester as a white solid (224 mg, 32%). LCMS: RT=3.66 min, [M+H]+=311/313/315.

1. concentrationThe heterogeneous mixture was concentrated in vacuo
2. customthe resultant residue was purified by column chromatography (SiO2, gradient 0-30% ethyl acetate in cyclohexane)