Enantioselective addition of β-functionalized allylboronates to aldehydes and aldimines. Stereocontrolled synthesis of α-methylene-γ-lactones and lactams
作者:Isabelle Chataigner、Françoise Zammattio、Jacques Lebreton、Jean Villiéras
DOI:10.1016/j.tet.2007.12.046
日期:2008.3
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。