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.