Methyl 2-siloxycyclopropanecarboxylates (1) smoothly add to dimethylmethyleneammonium trifluoromethanesulphonate, generated in situ, or to the corresponding minium chloride (4) in the presence of TiCl4, giving α-aminomethylated γ-oxoesters (6) in good yield; these can serve as precursors for α-methylene-γ-butyrolactones (7) as well as for acrylic ester derivatives (8).
                                    将2-甲
硅烷氧基
环丙烷甲酸甲酯(1)平稳地添加到原位生成的
三氟甲磺酸二甲基亚甲基
铵盐中,或在存在TiCl 4的情况下添加到相应的最小
氯化物(4)中,以高收率得到α-
氨基甲基化的γ-氧酸酯(6);这些可用作α-亚甲基-
γ-丁内酯(7)和
丙烯酸酯衍
生物(8)的前体。