反应详情

温度

40 °C

Using the procedure of Example 17, 8 g of phosphorous oxychloride were slowly added to a mixture of 8 g of 3-methyl-1,2,4-oxadiazol-5-yl-acetic acid and 6.2 g of dry benzyl alcohol with the rate of addition adjusted to a reaction temperature of 40°-45° C. The resulting reaction mixture was stirred for 5 hours at 40° C. and then was treated in the usual manner. The obtained yellow oil was submitted to column chromatography over silica employing as eluents n-hexane and 3:1 hexane-toluene-, 1:1-toluene-hexane, 3:1 toluene-hexane mixture, toluene and finally a 3:1 toluene-diethyl ether mixture. The finally obtained colorless oil was 6.1 g (47% yield) of benzyl 3-methyl-1,2,4-oxadiazol-5-yl-acetate with a purity of about 95% (according to TLC and PMR spectrum) and a refractive index nD25 =1.518.

1. customadjusted to a reaction temperature of 40°-45° C
2. customThe resulting reaction mixture
3. additionwas treated in the usual manner