Difluoromethylation of the activated X–H bond and aliphatic thiols, and gem-difluorocyclopropenation of alkynes with difluorocarbene generated by decarboxylation are described.
Die vorliegende Erfindung betrifft die neue Verwendung der teilweise bekannten 2-Halogenalkylthio-substituierten Pyrimidin-Derivate der Formel (I)
in welcher
R¹ für Halogenalkyl steht,
R für Wasserstoff, Alkyl, Halogenalkyl, Halogenalkylthio, Halogenalkoxy, gegebenenfalls substituiertes Aryl oder für Halogen steht und
m für eine Zahl 0, 1, 2, oder 3 steht,
gegen tierische Schädlinge, insbesondere gegen Insekten, Spinnentiere und Nematoden.
Die Erfindung betrifft auch neue Verbindungen der Formel (Ia)
in welcher
R und m die unter (I) angegebene Bedeutung besitzen und
R² für Wasserstoff, Chlor, Brom oder Iod steht,
ausgenommen die Verbindungen 2-(Difluormethylthio)-4,6-dimethyl-pyrimidin, 2,4-bis(Difluormethylthio)-6-methyl-pyrimidin und 4-(Difluormethoxy)-2-(difluormethylthio)-6-methyl-pyrimidin.
本发明涉及部分已知的式 (I) 2-卤代烷基硫代嘧啶衍生物的新用途
其中
R¹ 代表卤代烷基、
R 是氢、烷基、卤代烷基、卤代烷硫基、卤代烷氧基、任选取代的芳基或卤素,以及
m 是数字 0、1、2 或 3、
防治动物害虫,特别是昆虫、蛛形纲动物和线虫。
本发明还涉及式 (Ia) 的新化合物
其中
R 和 m 具有 (I) 项下给出的含义,且
R² 是氢、氯、溴或碘、
但 2-(二氟甲硫基)-4,6-二甲基嘧啶、2,4-双(二氟甲硫基)-6-甲基嘧啶和 4-(二氟甲氧基)-2-(二氟甲硫基)-6-甲基嘧啶化合物除外。
Radical Difluoromethylation of Thiols with (Difluoromethyl)triphenylphosphonium Bromide
作者:Niklas B. Heine、Armido Studer
DOI:10.1021/acs.orglett.7b02109
日期:2017.8.4
A method for facile difluoromethylation of various thiols using (difluoromethyl)triphenylphosphonium bromide under mild reaction conditions is presented. The transformation proceeds in the absence of any transition metal using a bench-stable and readily accessible phosphonium salt. Deuterium labeling experiments and cyclic voltammetry measurements reveal that the difluoromethylation occurs via a S(RN)1-type mechanism. Substrate scope is broad, and various functional groups are tolerated (OH, NH2, amide, ester).
Radical Difluororomethylation of Thiols with Difluoromethylphosphonium Triflate under Photoredox Catalysis
作者:Yang Ran、Qing-Yu Lin、Xiu-Hua Xu、Feng-Ling Qing
DOI:10.1021/acs.joc.7b01041
日期:2017.7.21
A convenient, visible light-induced radical difluoromethylation of aryl-, heteroaryl-, and alkylthiols with difluoromethyltriphenylphosphonium triflate was developed to afford various difluoromethyl thioethers in moderate to excellent yields. The key reaction features include the use of a readily available CF2H radical source, mild reaction conditions, and excellent chemoselective "thiol-difluoromethylation.
<i>N</i>-Tosyl-<i>S</i>-difluoromethyl-<i>S</i>-phenylsulfoximine: A New Difluoromethylation Reagent for S-, N-, and C-Nucleophiles
作者:Wei Zhang、Fei Wang、Jinbo Hu
DOI:10.1021/ol900567c
日期:2009.5.21
The first alpha-difluoromethyl sulfoximine compound, 2, was successfully prepared by using the copper(II)-catalyzed nitrene transfer reaction. Compound 2 was found to be a novel and efficient difluoromethylation reagent for transferring the CF2H group to S-, N-, and C-nucleophiles. Deuterium-labeling experiments suggest that a difluorocarbene mechanism is involved in the current difluoromethylation reactions.