pentachlorostannate, which is an excellent Lewis acid and is successfully used to catalyze the [2 + 2] cycloadditions of N-substituted maleimides and silyl enol ethers to afford cycloadducts with excellent enantioselectivities (17 examples, up to 96% ee). This efficient synthetic methodology provides a new viable and significantly efficient route to ring-fused cyclobutanes bearing quaternary stereogenic centers by
嗜盐
路易斯酸SnCl 4生成
硫稳定的
硼阳离子,导致形成氧
硫杂
硼五
氯锡酸盐,它是一种优良的
路易斯酸,成功用于催化 N-取代马来
酰亚胺的 [2 + 2] 环加成反应和
硅烯醇醚提供具有优异对映选择性的环加合物(17 个例子,高达 96% ee)。这种高效的合成方法通过结合锅、原子和步骤经济性来合成复杂的有机分子,为带有四元立体异构中心的环稠合
环丁烷提供了一种新的可行且显着有效的途径。