The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 2017
Filed:
Aug. 04, 2015
Syngenta Participations Ag, Basel, CH;
Tomas Smejkal, Stein, CH;
Helmars Smits, Stein, CH;
Syngenta Participations AG, Basel, CH;
Abstract
The present invention relates to a process for the preparation of a compound of formula (I) wherein Aand Aare C—H, or one of Aand Ais C—H and the other is N; Ris C-Calkyl, C-Chaloalkyl or C-Ccycloalkyl; each Ris independently bromo, chloro, fluoro or trifluoromethyl; Ris hydrogen; Ris hydrogen, halogen, methyl, halomethyl or cyano; or Rand Rtogether form a bridging 1,3-butadiene group; Ris chlorodifluoromethyl or trifluoromethyl; n is 2 or 3; by reacting a compound of formula (II) wherein A, A, R, R, R, R, Rand n is as defined under formula (I) above, with hydroxylamine, a base and a chiral catalyst, characterized in that the chiral catalyst is a dimeric chiral catalyst of formula (III) wherein R, R, R, R, Rand X are as defined in claim.