Pyridachlometyl has a novel anti-tubulin mode of action which could be useful in anti-resistance management

Recent developments in fluorine-containing pesticides

To ensure ongoing sustainability, the modern agrochemical industry is faced with enormous challenges. These arise from provision of high-quality food to increasing water use and environmental impact as well as a growing world population. The loss of previous agrochemicals due to consumer perception, changing grower needs and ever-changing regulatory requirements is higher than the number of active ingredients that are being introduced into the crop protection market. Therefore, the development of novel agrochemicals is essential to provide improved efficacy and environmental profiles. In this context, the introduction of fluorine atoms and fluorine-containing motifs into a molecule is an important method to influence its physicochemical properties. These include, for example, small difluoro- and trifluoromethyl, or trifluoromethoxy groups at aryl or heterocyclic aryl moieties but also fragments like 2,2,2-trifluoroethoxycarbonyl, trifluoromethylsulfonyl, trifluoroacetyl, as well as the so far unusal rest like heptafluoro-iso-propyl. This review gives an overview of recent developments of fluorine-containing pesticides launched over the past 7 years and describes a selection of current fluorine-containing development candidates. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

Discovery and biological profile of pyridachlometyl

Pyridachlometyl is a novel tubulin dynamics modulator fungicide developed by Sumitomo as a new agent designed to tackle fungicide resistance. Pyridachlometyl is being developed as a first-in-class molecule with an anti-tubulin mode of action, the chemical structure of which is characterized by a unique tetrasubstituted pyridazine ring. The first commercial product 'Fuseki flowable' received initial registration in 2023 in Japan. The concepts of the discovery project, optimization of chemical structures, and biological profiles are reviewed herein. © 2024 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

Discovery of pyridachlometyl: A new class of pyridazine fungicides

Pyridachlometyl is a unique pyridazine fungicide with a novel mode of action. Herein, we describe the pathway for the invention of pyridachlometyl. First, we identified a diphenyl-imidazo[1,2-a]pyrimidine as our proprietary lead with potent fungicidal activity. Then, aiming to simplify the chemical structure, we applied judicious estimations to explore monocyclic heterocycles as pharmacophores. This enabled the identification of a novel class of tetrasubstituted pyridazine compounds with potent fungicidal activity, likely retaining the same mode of action as the aforementioned compounds. The findings indicated bioisosteric similarity between diphenyl-imidazo[1,2-a]pyrimidine and pyridazine. Further structure-activity and mammalian safety investigations of pyridazine compounds resulted in the discovery of pyridachlometyl as a candidate for commercial development.

Synthetic approaches to the 2015-2018 new agrochemicals

In this review, the synthesis of 33 agrochemicals that received an international standardization organization (ISO) name between January 2015 and December 2018 is described. The aim is to showcase the broad range and scope of reactions, reagents and intermediates used to discover and produce the latest active ingredients addressing the crop protection industry's needs.