反应详情

温度

0 °C

In a dry four-necked flask with stirrer motor, internal thermometer, dropping funnel with pressure equalizer and reflux condenser with argon inlet (aspirator with tap), 9.3 g of LiAlH4 are covered with 600 ml of diethyl ether. The suspension is cooled to 0° C. 30 g of ethyl 5-methyl-2-p-tolyloxazole-4-carboxylate are dissolved in 100 ml of diethyl ether and added dropwise to the suspension. After one hour of stirring at room temperature, the reaction has ended (TLC (heptane/ethyl acetate 1:1): Rf, starting material=0.66, Rf, product=0.18). 80 g of MgSO4, 300 ml of methyl tert-butyl ether and 30 ml of ethyl acetate are added successively, and the suspension is stirred at room temperature. The mixture is then cooled to 0° C., 90 ml of 10N KOH are added dropwise and the mixture is stirred for another 60 min. The solids are filtered off, the residue is washed three times with ethyl acetate and the filtrate is concentrated, giving 24 g of 5-methyl-2-p-tolyl-oxazole-4-methanol as a yellow solid. C12H13NO2 (203.24), LCMS(ESI): 204.1 (MH+).

1. customIn a dry four-necked flask with stirrer motor, internal thermometer, dropping
2. additionadded dropwise to the suspension
3. stirringthe suspension is stirred at room temperature
4. temperatureThe mixture is then cooled to 0° C.
5. stirringthe mixture is stirred for another 60 min
6. filtrationThe solids are filtered off
7. washthe residue is washed three times with ethyl acetate
8. concentrationthe filtrate is concentrated