Ethyl Acetate → 1-(3,4,5-Trimethoxybenzyl)-2-oxopyrrolidine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Combine 2-pyrrolidinone (2.85 g, 33.5 mmol) and tetrahydrofuran (70 mL). Cool to −78° C. using a dry-ice/acetone bath. Add a solution of potassium bis(trimethylsilyl)amide (67 mL, 0.5 M in toluene, 33.5 mol). After 45 minutes, add a solution of 3,4,5-trimethoxybenzyl mesylate (8.8 g, 32.02 mmol) in tetrahydrofuran (60 mL). After the addition of 3,4,5-trimethoxybenzyl mesylate is complete, heat to reflux. After 18 hours, cool the reaction mixture and partition between water and ethyl acetate. Separate the aqueous layer and extract 4 times with ethyl acetate. Dry the combined organic layers over Na2SO4, filter, and concentrate in vacuo to obtain a residue. Chromatograph the residue on silica gel eluting with ethyl acetate to give the title compound: Rf=0.35 (silica gel, ethyl acetate).

Herkunft & Nachweise