Treatment of derivatives of δ-lactones having a leaving group at C-2 with methanol in the presence of base gives methyl tetrahydrofuran-α-carboxylates in good to excellent yield with a high degree of stereocontrol of the carbon substituents at C-2 and C-5.
在碱存在下,用
甲醇处理C-2位带有保护基的γ-内酯衍
生物,可以得到甲基
四氢呋喃-γ-
羧酸酯,收率良好到极佳,且C-2和C-5位碳取代基具有高度的立体选择性。