ketospiro-enesulfonamides. By treatment with ZrCl4 and allylsilane, an intramolecular electrophilic aromatic substitution and subsequent allylation is observed. By treatment with TiCl4 and allylsilane, a double enamine-type reaction takes place, thus creating simultaneously four contiguous stereogenic centers diastereoselectively.
从酮螺-烯磺酰胺开始,描述了两个前所未有的多米诺骨牌反应。通过用ZrCl 4和烯丙基
硅烷处理,观察到分子内亲电子芳族取代和随后的烯丙基化。通过用TiCl 4和烯丙基
硅烷处理,发生了双烯胺型反应,从而同时非对映选择性地产生了四个连续的立体异构中心。