Abstract:
Process for preparing substituted isoxazoline compounds and their precursors The present invention relates to a new method of preparing halogenated styrene compounds of Formula (VIII), which are precursors in the process of synthesis of substituted isoxazoline compounds of Formula (I), wherein R 1 to R 5 , R 8 and R 9 are described as in the description. The present invention relates further to the synthesis of compounds of formula (I) starting from acetophenones. The desired styrenes of formula are prepared from the appropriate substituted acetophenone. Asides bromo anilines react with formoxime. Obtained oximes undergo a cycloaddition with the styrenes and give isoxazolines. Compounds of formula (I) can then be prepared in a palladium catalyzed carbonylative ami- nation reaction of the isoxazolines.
Abstract:
A process for preparing alkyl 2-alkoxymethylene-4,4-difluoro-3-oxobutyrates (VI) where R is methyl or ethyl, from crude reaction mixtures of alkyl 4,4-difluoroacetoacetates (I) by a) reacting alkyl acetate (II), RO M alkoxide (III), where M is a sodium or potassium ion, and alkyl difluoroacetate (IV), without additional solvent to form an enolate (V), b) releasing the corresponding alkyl 4,4-difluoroacetoacetate (I) from the enolate (V) by means of acid, c) removing the salt formed from cation M and acid anion as a solid and d) converting (I), without isolation from the crude reaction mixture, to the alkyl 2-alkoxymethylene-4,4-difluoro-3-oxobutyrate (VI), and the use of (VI) for preparing 1-methyl-3-difluoromethyl-pyrazol-3-ylcarboxyates (VII).
Abstract:
The present invention relates to pyrimidin-4-ylmethyl-sulfonamides of formula (I) wherein R a , n, R, A, Y and Het are as defined in the Claims and to the N-oxides, and salts thereof and their use for combating harmful fungi, and also to compositions and seed comprising at least one such Compound. The invention also relates to a process for preparing these compounds.
Abstract:
Gegenstand der vorliegenden Erfindung ist ein Verfahren zur Herstellung von Isoxazolen der Formel I
wobei die Substituenten folgende Bedeutung haben: R 1 Wasserstoff, C 1 -C 6 -Alkyl, R 2 C 1 -C 6 -Alkyl, R 3 ,R 4 ,R 5 Wasserstoff, C 1 -C 6 -Alkyl oder R 4 und R 5 bilden zusammen eine Bindung, R 6 heterocyclischer Ring, n 0, 1 oder 2; umfassend die Herstellung einer zwischenverbindung der Formel VI
wobei R 1 , R 3 , R 4 und R 5 die oben angegebenen Bedeutungen haben, und anschließender Halogenierung, Thiomethylierung, Oxidation und Acylierung zu Verbindungen der Formel I. Die Erfindung betrifft ferner neue Zwischenprodukte zur Herstellung der Verbindungen der Formel I und neue Verfahren zur Herstellung der Zwischenprodukte.
Abstract:
The present invention relates to a process for the chlorination of 3-halopyridine with molecular chlorine in the presence of water under UV light irradiation in the vapor phase. The present invention further relates to a multi-step process for producing 5-chloro-3,6-difluoropyridin-2-amine.
Abstract:
The invention relates to hydroxymethyl compounds of formula (VI), wherein Z is hydrogen or halogen; and Z 1 is hydrogen, halogen, cyano or nitro; as well as their use as intermediates in the synthesis of herbicidal imidazolinones.