Fused piperidinones were assembled from chiral allylsilanes possessing an oxime moiety using a stereocontrolled formal [2+2+2] radical-ionic process. The cascade involves the addition of an α-iodo ester to an ene oxime, which is then followed by a 5-exo-trig cyclization onto the aldoxime function producing an alkoxyaminyl radical species that finally lactamizes to afford piperidinones. Application of the radical cascade to ketoximes led instead to cyclopentanes incorporating two ester fragments as a result of a recombination process.
                                    利用立体可控的正规[2+2+2]自由基-离子过程,从具有
肟分子的手性烯丙基
硅烷组装出了融合
哌啶酮。级联过程包括在烯
肟中加入δ-
碘酯,然后在醛
肟官能团上进行 5-外-
三环化反应,产生烷氧基
氨基自由基,最后内酰胺化生成
哌啶酮。将自由基级联应用于酮
肟(ketoximes)时,由于
重组过程的结果,
环戊烷中含有两个酯片段。