<i>m-</i>C<sub>Ar</sub>–H Bond Alkylations and Difluoromethylation of Tertiary Phosphines Using a Ruthenium Catalyst
作者:Gang Li、Jiangzhen An、Chunqi Jia、Bingxu Yan、Lei Zhong、Junjie Wang、Suling Yang
DOI:10.1021/acs.orglett.0c03377
日期:2020.12.18
m-CAr–H bond functionalization of tertiaryphosphines was developed using [Ru(p-cymene)Cl2]2 as a catalyst. Desired product structures were confirmed by single-crystal X-ray diffraction. Mechanistic experiments indicated that m-CAr–H bond functionalization was a radical reaction and that a hexagonal ruthenacycle complex was a crucial intermediate in the process. Therefore, this study provides a novel
使用[Ru(p- Cymene)Cl 2 ] 2作为催化剂,开发了叔膦的m -C Ar -H键官能化。通过单晶X射线衍射确认了所需的产物结构。机理实验表明,m -C Ar -H键官能化是一个自由基反应,六角形钌环络合物是该过程中的关键中间体。因此,本研究提供了后期的新颖的方法的元联苯单膦配位体的位上修饰。
Pd-Catalyzed Asymmetric C–H Bond Activation for the Synthesis of P-Stereogenic Dibenzophospholes
作者:Zhen Li、Zi-Qi Lin、Chao-Guo Yan、Wei-Liang Duan
DOI:10.1021/acs.organomet.9b00216
日期:2019.10.28
Pd-catalyzed asymmetric C–Hbondactivation for the synthesis of P-stereogenic dibenzophospholes was efficiently achieved via two types of catalytic systems. Chiral phosphoric amides/acids as ligands provided the products with up to 5:95 er, and (R)-segphos as ligand resulted in enantioselectivities of up to 98:2.
A practical and efficient electrochemical approach for the synthesis of π-conjugated phosphonium salts via intramolecular annulation and the construction of the C–P bond is developed. This reaction proceeded under catalyst- and adscititious oxidant-free conditions at roomtemperature. A series of substituted π-conjugated phosphonium salt products were obtained with good functional group tolerance and