反应详情

温度

0 °C

3.46 g of methyl 3-(5-methyl-1,2,4-oxadiazol-3-yl)benzoate (15.86 mmol) are dissolved in 50 ml of abs. THF in a 250 ml three-necked flask, and 0.691 g of LiBH4 (31.71 mmol) is subsequently introduced in portions with stirring at 0° C. under a nitrogen atmosphere, and the mixture is stirred without cooling for a further 20 h. For work-up, the reaction mixture is adjusted to pH 7 by slow dropwise addition of 1 N HCl with stirring, diluted with 100 ml of water and extracted 3× with 50 ml of dichloromethane. The combined organic phases are washed 1×100 ml of water, dried over sodium sulfate and evaporated to dryness in a rotary evaporator. The purification is carried out by chromatography (50 g of silica gel/DCM+0-1% of MeOH). The product is crystallised from diethyl ether/petroleum ether; m.p. 57-58° C.

1. stirringthe mixture is stirred
2. temperaturewithout cooling for a further 20 h
3. stirringwith stirring
4. extractionextracted 3× with 50 ml of dichloromethane
5. washThe combined organic phases are washed 1×100 ml of water
6. dry with materialdried over sodium sulfate
7. customevaporated to dryness in a rotary evaporator
8. customThe purification
9. customThe product is crystallised from diethyl ether/petroleum ether