Palladium catalysed cross-coupling of (fluoroarene)tricarbonylchromium(0) complexes
作者:René Wilhelm、David A. Widdowson
DOI:10.1039/b006576p
日期:——
(Fluoroarene)tricarbonylchromium(0) complexes were found to undergo Suzuki and Stille cross-coupling reactions to form functionalised biaryl and styrene complexes in up to 87 and 52% yields, respectively. The Suzuki reactions were optimal with dipalladium tris(dibenzylideneacetone)–trimethylphosphine–caesium carbonate in DME at reflux. The Stille reactions were optimal with dipalladium tris(dibenzylideneacetone)–trimethylphosphine–caesium fluoride in DME at reflux and neither was adversely affected by a methoxy group on the complexed ring. The Suzuki reaction tolerated a chloro group on the arylboronic acid ring but not a bromo group.
Ag/Pd Cocatalyzed Direct Arylation of Fluoroarene Derivatives with Aryl Bromides
作者:Adyasha Panigrahi、Daniel Whitaker、Iñigo J. Vitorica-Yrezabal、Igor Larrosa
DOI:10.1021/acscatal.9b05334
日期:2020.2.7
these functionalizations. However, all of these processes are limited by the wasteful requirement for (super)stoichiometric Ag(I) salts. Herein, we report the development of a Ag/Pd cocatalyzed directarylation of (fluoroarene) chromium tricarbonyl complexes with bromoarenes. The small organic salt, NMe4OC(CF3)3, added as a halide abstractor, enables the use of a catalytic amount of Ag, reversing the
Method of producing oxybutynin and its derivatives
申请人:THE UNIVERSITY OF TOKYO
公开号:US20040006243A1
公开(公告)日:2004-01-08
An oxybutynin and its derivatives are produced by reacting a phenylketone with a silylcyanide in the presence of a specified asymmetric catalyst to obtain a siloxynitrile, and then reacting the siloxynitrile with a reducing agent and oxidizing the resulting aldehyde, or subjecting the siloxynitrile to a hydrolysis.
Arene–Metal π-Complexation as a Traceless Reactivity Enhancer for C–H Arylation
作者:Paolo Ricci、Katrina Krämer、Xacobe C. Cambeiro、Igor Larrosa
DOI:10.1021/ja405936s
日期:2013.9.11
approach where C-H arylation is made possible without altering the connectivity of the arene via π-complexation of a Cr(CO)3 unit, greatly enhancing the reactivity of the aromatic C-H bonds. We apply this approach to monofluorobenzenes, highly unreactive arenes, which upon complexation become nearly as reactive as pentafluorobenzene itself in their couplings with iodoarenes. DFT calculations indicate that
Lithiation of 2-, 3-, and 4-fluoroanisole(tricarbonyl)chromium(0) complexes: a reversal of normal regiocontrol
作者:John P. Gilday、David A. Widdowson
DOI:10.1039/c39860001235
日期:——
Lithiation of tricarbonyl(fluoroanisole)chromium(0) complexes occurs exclusively ortho to the fluorine atom, not the oxygen atom as observed in the uncomplexed arenes; the X-ray structure of complex (1) shows that the specificity is not caused by steric inhibition of lithium base co-ordination by oxygen.