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 three-componentreaction involving arynes, trialkyl phosphites, and halides has been achieved under mild reaction conditions. This transformation provides a direct synthetic approach to ortho-halogenated arylphosphonates, which could be rapidly converted to diversely ortho-functionalized arylphosphorus compounds.
Synthesis of hydroxylated oligoarene-type phosphines by a repetitive two-step method
作者:Shunpei Ishikawa、Kei Manabe
DOI:10.1016/j.tet.2009.10.101
日期:2010.1
oligoarene-type phosphines with various substitution patterns were synthesized. Such phosphines have potential as ligands for transition metal-catalyzed reactions. A successful route, which includes a repetitive Suzuki–Miyaura coupling–triflation sequence, reduction, and salt formation, was established starting from 2-bromophenyldicyclohexylphosphine oxide. Other key aspects of the method are the use of
Diels-Alder reaction in organometallic chemistry. V. Tetramethyl acetylenediphosphonate and dimethyl chloroacetylenephosphonate and their reactions with cyclopentadiene, 1,3-cyclohexadiene, and diazomethane