Stepwise Mechanism for the Bromination of Arenes by a Hypervalent Iodine Reagent
作者:Albert Granados、Alexandr Shafir、Ana Arrieta、Fernando P. Cossío、Adelina Vallribera
DOI:10.1021/acs.joc.9b02784
日期:2020.2.21
A mild, metal-free bromination method of arenes has been developed using the combination of bis(trifluoroacetoxy)iodobencene and trimethylsilyl bromide. In situ-formed dibromo(phenyl)-λ3-iodane (PhIBr2) is proposed as the reactive intermediate. This methodology using PIFA/TMSBr has been applied with success to a great number of substrates (25 examples). The treatment of mono-substituted activated arenes
An object of the present invention is to provide a novel substance that has a high reactivity as a fluorinating agent, is effectively used in various fluorination reactions, and is safely handled even in air. As the solution for achieving this object, the present invention provides a complex obtained by reacting bromine trifluoride with at least one metal halide selected from the group consisting of halogenated metals and halogenated hydrogen metals in a nonpolar solvent. This complex serves as a fluorinating agent that provides excellent fluorination performance and that is stable in air.
Synthesis and Application of a New Class of Planar and Centrally Chiral Ferrocenyl Amino Alcohol Ligands
作者:Annette Benson、Laura Cunningham、Patrick J. Guiry
DOI:10.1002/ejoc.202300951
日期:2024.5.13
The highly enantioselective, facile, scalable, and robust synthesis of a new family (14 examples) of aminoalcohol ligands possessing planar and central chirality that is described. They were applied to the diethylzinc and diphenylzinc additions to aldehydes with up to 98 % yield and 99 % ee and 82 % yield and 88 % ee, respectively.
BrF3-KHF2, an air-stable solid prepared from BrF3 and KHF2, was used in the various fluorination reactions, including desulfurizing fluorination reactions of benzylic sulfides, ketone and aldehyde dithioacetals, (phenylthio)glycosides, and trimethyl trithioorthocarboxylates. As the results, one to three fluorine atoms were selectively introduced to the substrates. (C) 2014 Elsevier B.V. All rights reserved.