General and Stereoselective Method for the Synthesis of Sterically Congested and Structurally Diverse <i>P</i>-Stereogenic Secondary Phosphine Oxides
作者:Zhengxu S. Han、Hao Wu、Yibo Xu、Yongda Zhang、Bo Qu、Zhibin Li、Donald R. Caldwell、Keith R. Fandrick、Li Zhang、Frank Roschangar、Jinhua J. Song、Chris H. Senanayake
DOI:10.1021/acs.orglett.7b00568
日期:2017.4.7
A general and efficient method for the synthesis of bulky and structurally diverse P-stereogenic chiral secondary phosphine oxides (SPOs) by using readily available chiral amino alcohol templates is described. These chiral SPOs could be used as chiral building blocks for the synthesis of difficult-to-access bulky P-stereogenic phosphine compounds or ligands for organic catalysis.
Comparison of Dynamic HPLC and Dynamic NMR in the Study of Conformational Stereodynamics: Case of the Enantiomers of a Hindered Secondary Phosphine Oxide<sup>1</sup>
作者:F. Gasparrini、L. Lunazzi、A. Mazzanti、M. Pierini、K. M. Pietrusiewicz、C. Villani
DOI:10.1021/ja9941779
日期:2000.5.1
Static and dynamic stereochemistry of HP(O)ButAr (Ar = 2-methyl-1-naphthyl) has been studied by a combination of variable-temperature NMR (1H and 13 P), HPLC, and CD measurements as well as by MM calculations. Two unequally populated stereolabile isomers for each configurational enantiomer have been detected and their anticlinal and synclinal structures assigned. All the four species have been physically
HP(O)ButAr(Ar = 2-methyl-1-naphthyl)的静态和动态立体化学已通过变温 NMR(1H 和 13P)、HPLC 和 CD 测量以及 MM 计算的组合进行了研究. 已检测到每个构型对映体的两种不等量的立体不稳定异构体,并指定了它们的背斜和向斜结构。所有四种物质均已在 -83 °C 的低温 HPLC 对映选择性柱上进行物理分离和鉴定。动态 NMR 测得的互变势垒与动态 HPLC 测得的值基本相同(分别为 14.75 和 14.95 kcal mol-1)。