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]-
Oxidative Phosphonylation of Aromatics with Ammonium Cerium(IV) Nitrate Arylphosphonates 5 and 6 can be prepared in good yields in a one-step synthesis starting from arenes with tri- or diethylphosphites and cerium ammonium nitrate (CAN) as oxidant. The selectivity of the oxidative phosphonylation is relatively low; the reactive species is a phosphite radical cation.
Rhodium(iii)-catalyzed ortho-olefination of aryl phosphonates
作者:Bathoju Chandra Chary、Sunggak Kim
DOI:10.1039/c3ob41548a
日期:——
Rhodium(III)-catalyzed C–H olefination of aryl phosphonic esters is reported for the first time. In this mild and efficient process, the phosphonic ester group is utilized successfully as a new directing group. In addition, mono-olefination for aryl phosphonates is observed using a phosphonic diamide directing group.
Antibacterial activity is exhibited by .beta.-lactams having a phosphinic or phosphonic substituent in the 1-position and an acylamino substituent in the 3-position.
Palladium-Catalyzed Reaction of Aryl Polyfluoroalkanesulfonates with<i>O,O</i>-Dialkyl Phosphonates
作者:Xiyan Lu、Jingyang Zhu
DOI:10.1055/s-1987-28063
日期:——
Arylphosphonates were synthesized by the reaction of aryl polyfluoroalkanesulfonates with O,O-dialkyl phosphonates in the presence of triethylamine under palladium catalysis in good to excellent yield.