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]-
Some aliphatic diphosphonic tetrachlorides. Part II. Some reactions of diphosphonic tetrachlorides
作者:Gennady M. Kosolapoff、Alfred D. Brown
DOI:10.1039/j39670001789
日期:——
Aliphaticdiphosphonictetrachlorides and Grignard reagents containing aryl groups readily gave diphosphine dioxides, of which several are described. In a similar reaction of the tetrachlorides with Grignard reagents containing branched alkyl groups the products were not the expected diphosphine dioxides, but the products of mono-substitution at each phosphorus atom accompanied by a reduction. A similar
Reduction of tertiary phosphine oxides to phosphine-boranes using Ti(Oi-Pr)4/BH3-THF
作者:Sylwia Sowa、K. Michał Pietrusiewicz
DOI:10.1016/j.tet.2021.132057
日期:2021.4
A new method for reduction of tertiaryphosphine oxides leading to the formation of tertiary phosphine-boranes has been developed. The BH3-THF/Ti(Oi-Pr)4 reducing system enables conversion of triaryl, diarylalkyl and trialkylphosphine oxides directly to their borane analogues in good to high yields. In contrast to the previously reported protocols, the presence of activating groups in the structure
已经开发出一种用于还原叔膦氧化物的新方法,该方法导致形成叔膦硼烷。BH 3 -THF / Ti(O i -Pr)4还原系统能够将三芳基氧化物,二芳基烷基氧化物和三烷基膦氧化物直接转化为它们的硼烷类似物,并且产率高至高。与先前报道的方案相反,起始材料的结构中活化基团的存在对于反应的发生不是必需的。该反应是高度立体选择性的,并且主要保留在磷原子处的构型。已经提出了通过BH 3 -THF / Ti(O i -Pr)4还原P O键的合理机理。
Formation of aryl dialkylphosphinates from dialkylphosphinous chlorides and arylmagnesium bromides under oxidative conditions