公开(公告)号：US20210171540A1

公开(公告)日：2021-06-10

申请号：US16770377

申请日：2018-12-04

Applicant: Syngenta Participations AG

Inventor： James Alan MORRIS ,  Alexandr SHAFIR ,  Mallikharjuna GONU ,  Iffat BILAL ,  David Alexander SALE

IPC: C07D498/04 ,  B01J31/28 ,  B01J31/24

Abstract: The present invention relates to a novel process for the synthesis of herbicidal pyrazolidinedione compounds. In particular, a process for the preparation of a compound of formula (I), wherein R1, R2 and R3 are as defined herein. The present invention further relates to novel intermediate compounds utilized in said process, and methods for preparing said intermediate compounds.