Radical Phosphorylation of Aliphatic C–H Bonds via Iron Photocatalysis
作者:Guang-Da Xia、Zi-Kui Liu、Yu-Lian Zhao、Feng-Cheng Jia、Xiao-Qiang Hu
DOI:10.1021/acs.orglett.3c01824
日期:2023.7.21
The synthesis of tertiary phosphines(III) has been a long-standing challenge in synthetic chemistry because of inevitable issues including harsh conditions, sensitive organometallic reagents, and prefunctionalized substrates in traditional synthesis. Herein, we report a strategically novel C(sp3)–H bond phosphorylation that enables the assembly of structurally diverse tertiary phosphines(III) from industrial
iron-catalyzed C(sp3)–H phosphorylation reaction enabled by a photoinduced ligand-to-metal charge transfer (LMCT) process. The reaction exhibits remarkably broad substrate scope (>66 examples), including various alkanes, halides, ketones, esters, nitriles, ethers, thioethers, and silanes as viable substrates. Notably, unconventional site selectivity of C–H phosphorylation is achieved, with the occurrence of
One-Pot Synthesis of 1,3-Bis(phosphinomethyl)arene PCP/PNP Pincer Ligands and Their Nickel Complexes
作者:Wei-Chun Shih、Oleg V. Ozerov
DOI:10.1021/acs.organomet.5b00671
日期:2015.9.28
A one-pot synthesis of arene-based PCP/PNP ligands has been developed. The reaction of 1,3-bis(bromomethyl)benzene or 2,6-bis(bromomethyl)pyridine with various chlorophosphines in acetonitrile afforded bis-phosphonium salts. These salts can then be reduced by magnesium powder to yield PCP or PNP ligands. In comparison to traditional synthetic methods for making PCP/PNP ligands involving the use of secondary phosphines, this new alternative method allows for the use of chlorophosphines, which are cheaper, safer to handle, and have a broader range of commercially available derivatives. This is especially true for the chlorophosphines with less bulky alkyl groups. Moreover, the one-pot procedure can be extended to allow for the direct synthesis of PCP/PNP nickel complexes. By using nickel powder as the reductant, the resulting nickel halide was found to directly undergo metalation with the PCP or PNP ligand to generate nickel complexes in high yields.