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Efficient Asymmetric Synthesis of P‑Chiral Phosphine Oxides via Properly Designed and Activated Benzoxazaphosphinine-2-oxide Agents

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journal contribution
posted on 19.02.2016, 22:05 authored by 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
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.