A silver‐mediated oxidative difluoromethylation of styrenes and vinyl trifluoroborates with TMSCF2H is reported for the first time. This method enables direct and facile access to CF2H‐alkenes from abundant alkenes with excellent functional‐group compatibility. Moreover, this Ag/TMSCF2H protocol could further enable a series of radical difluoromethylation reactions of a wide array of substrates, offering
Pd‐Catalyzed Synthesis of Vinyl Arenes from Aryl Halides and Acrylic Acid
作者:Yang Gao、Yang Ou、Lukas J. Gooßen
DOI:10.1002/chem.201902022
日期:——
reaction of acrylic acid, immediately followed by protodecarboxylation of the cinnamic acid intermediate. The use of the carboxylate group as a deciduous directing group ensures high selectivity for monoarylated products. The vinylation process is generally applicable to diversely substituted substrates. Its utility is shown by the synthesis of drug‐like molecules and the gram‐scale preparation of key intermediates
[EN] MICROBIOCIDAL QUINOLINE (THIO)CARBOXAMIDE DERIVATIVES<br/>[FR] DÉRIVÉS MICROBIOCIDES DE QUINOLÉINE (THIO)CARBOXAMIDE
申请人:SYNGENTA PARTICIPATIONS AG
公开号:WO2019053010A1
公开(公告)日:2019-03-21
Compounds of the formula (I) wherein the subsitiuents are as defined in claim 1. Furthermore, the present invention relates to agrochemical compositions which comprise compounds of formula (I), to preparation of these compositions, and to the use of the compounds or compositions in agriculture or horticulture for combating, preventing or controlling infestation of plants, harvested food crops, seeds or non-living materials by phytopathogenic microorganisms, in particular fungi.
Methylenespiro[2.3]hexanes via Nickel-Catalyzed Cyclopropanations with [1.1.1]Propellane
作者:Songjie Yu、Adam Noble、Robin B. Bedford、Varinder K. Aggarwal
DOI:10.1021/jacs.9b10689
日期:2019.12.26
with poor selectivity. Herein, we report that nickel(0) catalysis enables the use of [1.1.1]propellane as a carbene precursor in cyclopropanations of a range of functionalized alkenes to give methylenespiro[2.3]hexane products. Computational studies provide support for initial formation of a Ni(0)-[1.1.1]propellane complex followed by concerted double C-C bond activation to give the key 3-methylenecyclobutylidene-nickel