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]-
Design of a Brønsted acid with two different acidic sites: synthesis and application of aryl phosphinic acid–phosphoric acid as a Brønsted acid catalyst
作者:N. Momiyama、T. Narumi、M. Terada
DOI:10.1039/c5cc06787a
日期:——
A Brønsted acid with two different acidic sites, aryl phosphinic acid–phosphoric acid, was synthesized and its catalytic performance was assessed.
一种具有两个不同酸性位点的Brønsted酸,芳基膦酸-磷酸,已合成并评估了其催化性能。
Oxidative Phosphonylierung von Aromaten mit Cerammoniumnitrat
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.
We describe the direct synthesis of organophosphorus compounds from ubiquitous aryl and vinyl carboxylic acids via decarbonylative palladium catalysis. The catalytic system shows excellent scope and tolerates a wide range of functional groups (>50 examples). The utility of this powerful methodology is highlighted in the late-stage derivatization directly exploiting the presence of the prevalent carboxylic
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.