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.
Manganese(III)-mediated direct phosphonylation of arenes
作者:Wei Xu、Jian-Ping Zou、Wei Zhang
DOI:10.1016/j.tetlet.2010.03.029
日期:2010.5
Manganese (III)-promoted direct phosphonylation of mono- and disubstituted arenes with dialkylphosphite afforded regioselective dialkylphosphonates in good yields. The reactions can apply to arenesbearing electron-donating groups and electron-withdrawinggroups such as ester and nitrile.
There are provided a compound capable of being a novel ligand allowing regioselective borylation to be performed in the aromatic borylation reaction, and a catalyst using the same compound. There is provided a bipyridyl compound represented by a general formula (
1
): (wherein A represents a single bond, a vinylene group or an ethynylene group;
X represents an oxygen atom or a sulfur atom;
n pieces of R
1
may be the same or different, and R
1
represents a hydrogen atom, a halogen atom, an optionally substituted hydrocarbon group, an optionally substituted alkoxy group, an optionally substituted aryloxy group, an optionally substituted amino group, a cyano group, a nitro group, or an alkoxycarbonyl group, or two adjacent R
1
may form a saturated or unsaturated ring structure optionally containing a hetero atom together with the carbon atoms bonded to the two R
1
;
R
2
represents a hydrogen atom, an optionally substituted hydrocarbon group, an optionally substituted alkoxy group, or an optionally substituted aryloxy group; and
n represents a number of
1
to
4
).
Arylphosphonate-Directed Ortho C–H Borylation: Rapid Entry into Highly-Substituted Phosphoarenes
作者:Feiyang Xu、Olivia M. Duke、Daniel Rojas、Hanka M. Eichelberger、Raphael S. Kim、Timothy B. Clark、Donald A. Watson
DOI:10.1021/jacs.0c04159
日期:2020.7.15
Phosphonate-directed ortho C-H borylation of aromatic phosphonates is reported. Using simple starting materials and com-mercially accessible catalysts, this method provides steady access to ortho-phosphonate aryl boronic esters bearing pendant functionality and flexible substitution patterns. These products serve as flexible precursors for a variety of highly-substituted phosphoarenes, and in situ