Reaction of bromomethylenebis(phosphonates) 1 with electrondeficient alkenes 2a-d as Michael acceptors in the presence of thallium(I) ethoxide leads to a new and facile route to 2-substituted 1,1-cyclopropanediylbis(phosphonates) 3 in satisfactory yield. These are converted into the corresponding free acids 7 by treatment with chlorotrimethylsilane in the presence of potassium iodide followed by treatment with water. The products resulted from bromomethylenebis(phosphonates) 1 and other alkenes 2e, f and methyl vinyl ketone are identified and discussed.
在
乙醇铊(I)存在下,
溴亚甲基双(
膦酸盐)1 与作为迈克尔受体的缺电烯烃 2a-d 发生反应,从而以一种新的简便方法制备出 2-取代的 1,1-环丙基双(
膦酸盐)3,收率令人满意。 在有
碘化钾存在的情况下,用三
甲基氯硅烷进行处理,然后用
水处理,这些物质就会转化成相应的
游离酸 7。
溴亚甲基双(
膦酸盐)1 与其他烯类 2e、f 和甲基
乙烯基酮生成的产物已被确认和讨论。