Direct Conversion of Phosphonates to Phosphine Oxides: An Improved Synthetic Route to Phosphines Including the First Synthesis of Methyl JohnPhos
作者:Alexander J. Kendall、Chase A. Salazar、Patrick F. Martino、David R. Tyler
DOI:10.1021/om500854u
日期:2014.11.10
reaction intermediate. A diverse array of phosphonates was converted to phosphine oxides using a variety of Grignard reagents for direct carbon–phosphorus functionalization. This new methodology especially simplifies the synthesis of dimethylphosphino (RPMe2)-type phosphines by using air-, water-, and silica-stable intermediates. To highlight this reaction, a new Buchwald-type ligand ([1,1′-biphenyl]-
A new and readily available bidentate ligand, namely, pyrrolidine-2-phosphonicacidphenylmonoester (PPAPM), has been developed for the copper-catalyzedformation of C-N, C-O, and P-C bonds, and various N-, O-, and P-arylation products were synthesized in good to excellent yields by using the CuI/PPAPM catalyst system. Addition of the PPAPM ligand greatly increases the reactivity of the copper catalyst
Photoinduced Transition-Metal-Free Cross-Coupling of Aryl Halides with H-Phosphonates
作者:Huiying Zeng、Qian Dou、Chao-Jun Li
DOI:10.1021/acs.orglett.8b04081
日期:2019.3.1
Photoinduced transition-metal- and photosensitizer-free cross-coupling of arylhalides (including Ar–Cl, Ar–Br, and Ar–I) with H-phosphonates (including dialkyl phosphonates and diarylphosphine oxides) is reported. Various functional groups were tolerated, including ester, methoxy, dimethoxy, alkyl, phenyl, trifluoromethyl, and heterocyclic compounds. This simple and green strategy provides a practical
Direct Aryloxylation/Alkyloxylation of Dialkyl Phosphonates for the Synthesis of Mixed Phosphonates
作者:Hai Huang、Johanna Denne、Chou‐Hsun Yang、Haobin Wang、Jun Yong Kang
DOI:10.1002/anie.201802082
日期:2018.5.28
A strategy for the direct functionalization strategy of inertial dialkyl phosphonates with hydroxy compounds to afford diverse mixed phosphonates with good yields and functional‐group tolerance has been developed. Mechanistic investigations involving both NMR studies and DFT studies suggest that an unprecedented highly reactive PV species (phosphoryl pyridin‐1‐ium salt), a key intermediate for this
The controllable phosphorylations of thioesters were developed. When the reaction was catalyzed by a palladium catalyst, aryl or alkenyl phosphoryl compounds were generated through decarbonylative coupling, while the benzyl phosphoryl compounds were produced through deoxygenative coupling when the reaction was carried out in the presence of only a base.