(2-氧代氧戊环-3-基) 乙酸甲酯

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

实验步骤: A mixture of racemic α-hydroxy-γ-butyrolactone (25 g; 0.25 mol), DMAP (1.5 g), acetylchloride (25.5 ml; 0.37 mol) in CH2Cl2 (325 mL) was added solid K2CO3 (50 g) in portions (slightly exothermic). The reaction mixture was stirred at room temperature overnight, filtered and evaporated to dryness. Column chromatography (Petrol ether 80-100:EtOAc=2:1) gave 26.4 g (75%) racemic α-acetoxy-γ-butyrolactone. filtered evaporated to dryness

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

实验步骤: reacting enantiopure (S) or (R) α-hydroxy-γ-butyrolactone with tosyl chloride to give enantiopure (S) or (R) α-tosyloxy-γ-butyrolactone (Step 5);