Development of an axially chiral sp3P/sp3NH/sp2N-combined linear tridentate ligand—fac-selective formation of Ru(II) complexes and application to ketone hydrogenation
作者:Tomoya Yamamura、Satoshi Nakane、Yuko Nomura、Shinji Tanaka、Masato Kitamura
DOI:10.1016/j.tet.2016.02.007
日期:2016.6
A newly developed chiral linear tridentate ligand, R-PN(H)N (R=H or Ph), possesses Ph2P and PyCH2NH groups at C(2) and C(2′) positions of the 1,1′-binaphthyl skeleton without or with a C(3)-Ph substituent. The steric effect of C(3)-Ph and the electronic effect of the DMSO co-ligand realize the facial selective generation of fac-RuCl2(Ph-PN(H)N)(dmso) and fac-[Ru(H-PN(H)N)(dmso)3](BF4)2, respectively
一种新开发的手性线性三齿配体R-PN(H)N(R = H或Ph),在1,1'的C(2)和C(2')位置具有Ph 2 P和PyCH 2 NH基团-具有或没有C(3)-Ph取代基的-萘基骨架。C(3)-Ph的空间效应和DMSO共配体的电子效应实现了fac -RuCl 2(Ph-PN(H)N)(dmso)和fac- [Ru(H- PN(H)N)(dmso)3 ](BF 4)2。H-Ru advantageoussp 3 N-H反应位点负责给体-受体双功能催化剂(DACat)和围栏/平面手性环境,均通过以下优点构建:i)sp3 P,sp 3 N和sp 2 N的连接原子具有不同的电子性质;ii)DMSO反式至sp 3 N与Ru强烈配位,并被PyC(6)H = O S氢键固定 iii)单个NH功能简化了DACat反应位点。协同作用已成功地实现了对空间需求的酮的不对称氢化。还研究了R-PN(H)N第一行过渡金属配合物的结构特征。