反应详情

To a cooled solution of 355 mg (1.17 mmol) 2-(2-methoxy-3-methyl-4-trifluoromethyl-phenyl)-4,4-dimethyl-4,5-dihydro-oxazole in 4 ml THF were added at <10° C. drop-wise over 20 min 2.35 ml (4.7 mmol) 2M ethylmagnesium chloride solution in THF. The resulting brown solution was stirred at ambient temperature for 1 h, then quenched with saturated aqueous NH4Cl solution (cooling with ice bath) and extracted three times with tert-butyl methyl ether. The combined organic phases were washed three times with brine, dried over Na2SO4, filtered and evaporated. 2-(2-Ethyl-3-methyl-4-trifluoromethyl-phenyl)-4,4-dimethyl-4,5-dihydro-oxazole was obtained as yellow oil: MS (ISP): 286.1 ((M+H)+.).

1. customquenched with saturated aqueous NH4Cl solution (cooling with ice bath)
2. extractionextracted three times with tert-butyl methyl ether
3. washThe combined organic phases were washed three times with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. customevaporated