乙基 4-(2-甲基-1,3-二氧戊环-2-基)丁酸乙酯

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a freshly prepared solution of lithium diisopropylamide (40.0 mmol in tetrahydrofuran/hexane; 50 mL, 1:1) at −78° C. was added a solution of ethyl-4-(2-methyl-1,3-dioxolan-2-yl)butanoate (6.7 g, 33.3 mmol) in tetrahydrofuran (15 mL) over 15 minutes. After stirring for 15 minutes, ethyl iodide (4.0 mL, 50.0 mmol) was added rapidly via syringe. The reaction was stirred at −78° C. for 6 hours and then allowed to warm slowly to ambient temperature and stir for 16 hours. The reaction was quenched by the addition of water (50 mL) and extracted with ether (3×50 mL). The combined organics were washed with brine (50 mL), dried (magnesium sulfate), concentrated in vacuo and chromatographed (silica gel, ethyl acetate/hexane, 1:4) to afford ethyl 2-ethyl-4-(2-methyl-1,3-dioxolan-2-yl)butanoate (2.6 g, 33%) as a colorless liquid. The reaction was stirred at −78° C. for 6 hours stir for 16 hours The reaction was quenched by the addition of water (50 mL) extracted with ether (3×50 mL) The combined organics were washed with brine (50 mL) dried (magnesium sulfate) concentrated in vacuo chromatographed (silica gel, ethyl acetate/hexane, 1:4)