Mild Silver-Mediated Geminal Difluorination of Styrenes Using an Air- and Moisture-Stable Fluoroiodane Reagent
作者:Nadia O. Ilchenko、Boris O. A. Tasch、Kálmán J. Szabó
DOI:10.1002/anie.201408812
日期:2014.11.17
conditions. One of the CF bonds is formed by transfer of electrophilic fluorine from the hypervalent iodine reagent, while the other one arises from the tetrafluoroborate counterion of silver. Deuterium‐isotope‐labelling experiments and rearrangement of methyl styrene substrates suggest that the reaction proceeds through a phenonium ion intermediate.
在 AgBF 4存在下,空气和水分稳定的氟碘适合在温和的反应条件下选择性地对苯乙烯进行孪生二氟化。C F 键之一是通过从高价碘试剂转移亲电子氟而形成的,而另一个是由银的四氟硼酸盐反离子产生的。氘同位素标记实验和甲基苯乙烯底物的重排表明反应是通过苯鎓离子中间体进行的。
Molecular Iodine as a Catalyst for Alkene Difluorination
The difluorination reaction of alkenes catalyzed by molecular iodine was revealed for the first time. This difluorination reaction affords a simple and practical experimental method and can be applied to many aliphatic and aromatic alkenes bearing synthetically useful functional groups, such as ester, amide, hydroxy, and aryl groups. Preliminary mechanistic studies of this alkene difluorination suggest
Hypervalent Iodine-Mediated Fluorination of Styrene Derivatives: Stoichiometric and Catalytic Transformation to 2,2-Difluoroethylarenes
作者:Tsugio Kitamura、Kensuke Muta、Juzo Oyamada
DOI:10.1021/acs.joc.5b01929
日期:2015.11.6
Fluorination of styrene derivatives with a reagent system composed of mu-oxo-bis[trifluoroacetato(phenyl)iodine] and a pyridine.HF complex gave the corresponding (2,2-difluoroethyl)arenes in good yields. Similarly, the reagent of PhI(OCOCF3)(2) and the pyridine.HF complex acted as a fluorinating agent for styrene derivatives. The fluorination of styrene derivatives with the pyridine. HF complex underwent under catalytic conditions using 4-iodotoluene as a catalyst and m-CPBA as a terminal oxidant.
Die Erfindung betrifft neue substituierte Piperidine, Verfahren zu ihrer Herstellung, ihre Verwendung zur Behandlung und/oder Prophylaxe von Krankheiten sowie ihre Verwendung zur Herstellung von Arzneimitteln zur Behandlung und/oder Prophylaxe von Krankheiten, insbesondere von Herz-Kreislauf-Erkrankungen und von Tumorerkrankungen.