Efficient Asymmetric Synthesis of <i>P</i>-Chiral Phosphine Oxides via Properly Designed and Activated Benzoxazaphosphinine-2-oxide Agents
作者:Zhengxu S. Han、Navneet Goyal、Melissa A. Herbage、Joshua D. Sieber、Bo Qu、Yibo Xu、Zhibin, Li、Jonathan T. Reeves、Jean-Nicolas Desrosiers、Shengli Ma、Nelu Grinberg、Heewon Lee、Hari P. R. Mangunuru、Yongda Zhang、Dhileep Krishnamurthy、Bruce Z. Lu、Jinhua J. Song、Guijun Wang、Chris H. Senanayake
DOI:10.1021/ja312352p
日期:2013.2.20
A general, efficient, and highly diastereoselective method for the synthesis of structurally and sterically diverse P-chiral phosphine oxides was developed. The method relies on sequential nucleophilic substitution on the versatile chiral phosphinyl transfer agent 1,3,2-benzoxazaphosphinine-2-oxide, which features enhanced and differentiated P N and P-O bond reactivity toward nucleophiles. The reactivities of both bonds are fine-tuned to allow cleavage to occur even with sterically hindered nucleophiles under mild conditions.
PROCESS FOR MAKING NOVEL CHIRAL PHOSPHORUS LIGANDS
申请人:HAN Zhengxu
公开号:US20140135506A1
公开(公告)日:2014-05-15
Disclosed are methods for making chiral phosphorus ligands including chiral phosphines, chiral phosphine oxides, phosphonamides, and aminophosphines. The chiral phosphorus ligands prepared by the methods of the invention are useful as components of chiral catalysts, e.g., transition metal complexes.