反应详情

Isopropylmagnesium chloride (2.0M in diethyl ether) (18.75 ml, 37.5 mmol) was added dropwise to a solution of 2-(2,3-dimethoxyphenyl)-4,4-dimethyl-4,5-dihydrooxazole (7.06 g, 30.0 mmol) in freshly distilled tetrahydrofuran at room temperature. The mixture was stirred overnight, quenched with water, and diluted with diethyl ether. The layers were separated, and the aqueous layer was washed twice with diethyl ether. The combined organic extracts were dried over anhydrous sodium sulfate, and concentrated in vacuo. Purification by silica gel flash chromatography, eluting with hexane/ethyl acetate, gave 2-(2-isopropyl-3-methoxyphenyl)-4,4-dimethyl-4,5-dihydrooxazole as a clear oil (7.08 g, 95.4%).

1. customquenched with water
2. additiondiluted with diethyl ether
3. customThe layers were separated
4. washthe aqueous layer was washed twice with diethyl ether
5. dry with materialThe combined organic extracts were dried over anhydrous sodium sulfate
6. concentrationconcentrated in vacuo
7. customPurification by silica gel flash chromatography
8. washeluting with hexane/ethyl acetate