INVESTIGADORES
SILBESTRI Gustavo Fabian
artículos
Título:
Threee-step synthesis of arylpolyboronic acids from phenols via organotin compounds
Autor/es:
P.M. FIDELIBUS; G.F. SILBESTRI; M.T. LOCKHART; S.D.MANDOLESI; A.B. CHOPA; J.C. PODESTÁ
Revista:
APPLIED ORGANOMETALLIC CHEMISTRY
Editorial:
Wiley- VCH
Referencias:
Lugar: Amsterdam; Año: 2007 p. 682 - 687
ISSN:
0268-2605
Resumen:
In this paper we describe a three-step synthesis of aryldi- and triboronic acids starting from phenols.
Several substituted phenols (I) were converted into the corresponding aryldiethylphosphates (II) in
good to excellent yields. The latter, on reaction with sodium trimethylstannide in liquid ammonia,
under irradiation, afforded the aryl- and heteroarylpoly(trimethylstannyl) derivatives in 6590%
yield. The third step is the reaction of the organotin compounds with borane in THF, which leads to
the corresponding arylpolyboronic acids in around 80% yield. In order to confirm their structure, some
of the diboronic acids were converted into the corresponding pinacol esters. The results obtained in
a study on the synthesis of various terphenyls through double and triple Suzuki couplings catalyzed
by palladium acetate between the obtained arylpolyboronic acids and various aryl halides are also
reported. These reactions proceeded with an average 65% yield, and also enabled us to confirm the
structures of some of the diboronic acids. The structure of the new compounds was determined by
1H, 13C and 119Sn NMR spectroscopy, mass spectrometry and IR spectroscopy.H, 13C and 119Sn NMR spectroscopy, mass spectrometry and IR spectroscopy.