the first [2+2] cycloaddition between a keteniminium salt and an alkene followed by a nucleophilic addition on the in situ generated cyclobuteniminium salts. This one-pot sequence enables the formation of quaternary centers with high level of stereoselectivity and is largely applicable to the synthesis of highly strained intermediates as well as precursor for spirohydantoïns. Moreover, DFT calculations
我们描述了酮
亚胺盐和烯烃之间的第一个[2 + 2]环加成反应,然后在原位生成的
环丁烯胺盐上进行了亲核加成反应。这种一锅法序列能够形成具有高立体选择性的四级中心,并且可广泛用于合成高张力中间体和螺乙内酰
脲的前体。此外,DFT计算支持
氘代实验,表明在[2 + 2]环加成过程中不存在自发的
亚胺-烯胺互变异构。