Synthesis, Crystal Structure, and Diastereomeric Transfer of Pentacoordinated Phosphoranes Containing Valine or Iso-Leucine Residue
作者:Hua Fu、Jing-Hua Xu、Ru-Ji Wang、Zhong-Zhou Chen、Guang-Zhong Tu、Qin-Zhu Wang、Yu-Fen Zhao
DOI:10.1080/10426500390228648
日期:2003.9.1
4b were obtained from benzene and hexane mixed solution. The x-ray structure of the crystals 4a and 4b revealed that they are distorted TBP, exhibiting RP absolute configuration. The 31P NMR spectra showed that the SP diastereomer could transfer into the other one RP that came out from the solution during crystallization. Correspondingly, when it was dissolved in solvents the RP diastereomer transferred
通过合成含有缬氨酸或异亮氨酸残基的五配位正膦(2-苯基-2,75-螺[1,3,2-菲二氧杂磷-2,2'-1,3,2-氧氮杂膦]-5'-one)苯二氯膦与N,O-双(三甲基甲硅烷基)缬氨酸或异亮氨酸的反应产物依次为两步反应,然后加入菲醌,从苯和己烷混合溶液中得到4a和4b的晶体。晶体 4a 和 4b 的 X 射线结构表明它们是扭曲的 TBP,表现出 RP 绝对构型。31P NMR 谱表明,SP 非对映异构体可以转移到结晶过程中从溶液中出来的另一种 RP。相应地,当它溶解在溶剂中时,RP 非对映异构体转移到另一种 SP,并且这对非对映异构体在室温下通过羧酸鏻两性离子中间体在溶液中相互改变。该工作得到了国家自然科学基金(29902003)、国家科委、教育部和清华大学的支持。