Patent number: 6518433
Abstract: A process for the production of a compound of formula (I)
wherein
R1 is hydrogen or C1-C4-alkyl;
R2 is hydrogen, C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkinyl, C3-C6-cycloalkyl or a radical —CH2B;
A is selected from the group consisiting of 2-chloropyrid-5-yl, tetrahydrofuran-3 -yl, 5-methyl-tetrahydrofuran-3-yl or 2-chlorothiazol-5-yl; and
B is phenyl, 3-pyridyl or thiazolyl, which are optionally substituted by one to three substituents selected from the group consisting of C1-C3-alkyl, C1-C3-halogenalkyl, cyclopropyl, halogencyclopropyl, C2-C3-alkenyl, C2-C3-alkinyl, C1-C3-alkoxy, C2-C3-halogenalkenyl, C2-C3-halogenalkinyl, C1-C3-halogenalkoxy, C1-C3-alkylthio, C1-C3-halogenalkylthio, allyloxy, propargyloxy, allylthio, propargylthio, halogenallyloxy, halogenallylthio, halogen, cyano or nitro;
and optionally the possible E/Z isomers, E/Z isomeric mixtures and/or tautomers thereof, respectively in free form or in salt form;
characterised in that a compound of formula (II)
Type:
Grant
Filed:
September 18, 2000
Date of Patent:
February 11, 2003
Assignee:
Syngenta Crop Protection, Inc.
Inventors:
Peter Maienfisch, Thomas Rapold, Henry Szczepanski