The kinetic products of the intramolecular acylation of γâ²-benzoyloxyphosphine oxides were revealed by conducting the reaction in the presence of an internal trapping agent. A high level of stereocontrol over the formation of both the stereogenic centre α to phosphorus and the hemiacetal centre was observed. The stereochemistry of the products was determined by X-ray crystallography and 1H NMR and the stereoselectivity of the reaction is explained in terms of the known structure and configurational instability of lithiated phosphine oxides.
通过在内部捕获剂存在下进行反应,揭示了γ'-苯甲酰氧膦氧化物内分子酰化反应的动力学产物。观察到对
磷原子α位和
半缩醛中心的形成具有高度立体控制性。通过X射线晶体学和1H核磁共振确定了产物的立体
化学性质,反应的立体选择性根据已知的结构和
锂代膦氧化物的构型不稳定性进行了解释。