反应详情

3,3-Dimethylglutaric anhydride (455 mg, 3.2 mmol) in tetrahydrofuran (THF, 5 ml) was treated with sublimed potassium t-butoxide (395 mg, 3.5 mmol). After 30 min the solution was concentrated, poured into saturated NaHCO3 solution and washed with ether. The aqueous phase was acidified to pH 4 with 0.5 M H3PO4 and extracted with chloroform which was dried over Na2SO4 and evaporated to afford 179 mg (26%) of the desired product as an oil. NMR (300 MHz, CDCl3, ppm), 1.13 (s,6H), 1.47 (s,9H), 2.33 (s,2H), 2.45 (s,2H).

1. concentrationAfter 30 min the solution was concentrated
2. additionpoured into saturated NaHCO3 solution
3. washwashed with ether
4. extractionextracted with chloroform which
5. dry with materialwas dried over Na2SO4
6. customevaporated