Upon activation by strong Brønsted acids, aziridinyl enolsilanes undergo (4+3) cycloadditions with dienes to afford aminoalkylated cycloheptenones as products. The use of a highly polar medium such as nitroalkane facilitates high cycloaddition yields of up to 99%. Optically pure aziridinyl enolsilanes react to yield (4+3) cycloadducts with up to 99% ee.
在强布朗斯特酸的激活下,氮杂环烯醇
硅烷与二烯发生(4+3)环加成反应,生成
氨基烷基化的
环庚烯酮作为产物。使用高极性介质如硝基烷可以促进高达99%的环加成产率。光学纯的氮杂环烯醇
硅烷反应生成的(4+3)环加成物具有高达99%的光学纯度(ee)。