反应详情

温度

110 °C

A solution of 9.22 g of 3-(tert-Butyl-dimethyl-silanyloxy)-2,2-dimethyl-propionic acid methyl ester and acetonitrile (2.34 mL, 44.88 mmol) in toluene (25 mL) is added dropwise over 1 h at reflux to a suspension of 1.80 g (44.88 mmol) NaH (60% dispersion in mineral oil) in anhydrous toluene (50 mL). The reaction mixture is heated to 110° C. for 18 h. The reaction mixture is diluted with 1M aqueous HCl solution to pH 7 and extracted with ethyl acetate (3×200 mL). The organic layers are combined, washed with water and brine, dried over Na2SO4 and filtered. The filtrate is concentrated under reduced pressure to afford 4.79 g of 5-hydroxy-4,4-dimethyl-3-oxo-pentanenitrile as a dark biphasic oil which is used crude in the next step. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.17 (s, 6H), 3.55 (s, 2H), 3.61 (s, 2H). Spectrum recorded on crude material, signals of TBMDS are present.

1. extractionextracted with ethyl acetate (3×200 mL)
2. washwashed with water and brine
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationThe filtrate is concentrated under reduced pressure