We report results regarding the development of condensations of chiral β-alkoxycarbonylallylboronates on aldehydes and imines. These allylboronates add in a highly enantioselective and diastereospecific manner to afford biologically and synthetically useful chiral α-methylene-γ-butyrolactones and lactams. The nature of the electrophile (aldehyde vs imine) is shown to have a dramatic influence on the
我们报告有关手性β-烷氧基羰基烯丙基
硼酸酯在醛和
亚胺上的缩合反应的发展结果。这些烯丙基
硼酸酯以高度对映选择性和非对映特异性的方式添加,以提供
生物学上和合成上有用的手性α-亚甲基-
γ-丁内酯和内酰胺。亲电子试剂的性质(醛对
亚胺)显示出对反应机理的巨大影响,可能通过不同的过渡态指导了过程的立体选择性。