A practical and cost-effective synthetic method of P-chiral diarylalkyl, aryldialkyl, and triaryl phosphineoxides by using readily available chiral diphenyl-2-pyrrolidinemethanol as the auxiliary is developed. The long-standing racemization issue during solvolysis has been addressed and well controlled by employing a suitable solvent, a low reaction temperature, and an appropriate reaction time.
Simple unprecedented conversion of phosphine oxides and sulfides to phosphine boranes using sodium borohydride
作者:Kamalraj V. Rajendran、Declan G. Gilheany
DOI:10.1039/c1cc14856g
日期:——
A variety of phosphineoxides and sulfides can be efficiently converted directly to the correspondingphosphine boranes using oxalyl chloride followed by sodium borohydride. Opticallyactive P-stereogenic phosphineoxides can be converted stereospecifically to phosphine boranes with inversion of configuration by treatment with Meerwein's salt followed by sodium borohydride.
作者:Oleg M. Demchuk、Wioletta Świerczyńska、Kamil Dziuba、Sławomir Frynas、Anna Flis、K. Michał Pietrusiewicz
DOI:10.1080/10426507.2016.1225052
日期:2017.1.2
GRAPHICAL ABSTRACT ABSTRACT A variety of tertiary phosphine sulfides have been reduced by Raney-Ni to give the corresponding phosphines with high efficiency and under mild conditions. Alkyl, aryl, acyclic, cyclic, as well as sterically crowded phosphine sulfides are reduced with equal facility. Optically active P-stereogenic phosphine sulfides are reduced stereospecifically with clean retention of
图形摘要 摘要 多种叔膦硫化物已被 Raney-Ni 还原,在温和的条件下高效地生成相应的膦。烷基、芳基、无环、环状以及空间拥挤的硫化膦用相同的设备还原。光学活性的 P-立体异构膦硫化物被立体定向地还原,并在 P 处保持构型的清洁。不饱和硫化膦的还原不是完全化学选择性的,并且伴随着双键的部分还原而发生。通过在 H2 气氛(气球)下进行还原,可以一步实现将不饱和膦硫化物完全还原为相应的完全饱和膦。