Biomaterial Database

Synthesis and fungicidal activity of tubulin polymerisation promoters. Part 1: pyrido[2,3-b]pyrazines. 2010

Patrick J Crowley, and Clemens Lamberth, and Urs Müller, and Sebastian Wendeborn, and Kurt Nebel, and John Williams, and Olivia-A Sageot, and Neil Carter, and Tanya Mathie, and Hans-Joachim Kempf, and Jeremy Godwin, and Peter Schneiter, and Markus R Dobler

Syngenta, Chemistry Department, Jealott Hill International Research Centre, Bracknell, Berkshire RG42 6EY, UK.

BACKGROUND The excellent fungicidal activity of [1,2,4]triazolo[1,5-a]pyrimidines suggested the search for further analogues with improved properties. RESULTS A series of novel trisubstituted pyrido[2,3-b]pyrazines has been designed and prepared as 6,6-biheterocyclic analogues of related 5,6-bicyclic [1,2,4]triazolo[1,5-a]pyrimidines. Their fungicidal activity was evaluated against the plant pathogens Puccinia recondita Rob. ex Desm. f. sp. tritici (Eriks.) CO Johnston (wheat brown rust), Mycosphaerella graminicola (Fuckel) Schroter (Septoria tritici Rob., leaf spot of wheat) and Magnaporthe grisea (Hebert) Barr (Pyricularia oryzae Cav., rice blast). Structure-activity relationship studies revealed the advantage of a fluoro substituent in position 6 and of a secondary amine in position 8. CONCLUSIONS 8-Amino-7-aryl-6-halogen-substituted pyrido[2,3-b]pyrazines have been prepared as 6,6-biheterocyclic analogues of similarly substituted triazolopyrimidine fungicides. A concise four-step synthesis route has been worked out to prepare these novel compounds from commercially available starting materials. [(R)-(1,2-Dimethylpropyl)]-[6-fluoro-7-(2,4,6-trifluorophenyl)pyrido[2,3-b]pyrazin-8-yl]amine showed excellent activity against three economically important phytopathogens.

UI	MeSH Term	Description	Entries
D010935	Plant Diseases	Diseases of plants.	Disease, Plant,Diseases, Plant,Plant Disease
D011719	Pyrazines	A heterocyclic aromatic organic compound with the chemical formula C4H4N2.	Pyrazine
D005658	Fungi	A kingdom of eukaryotic, heterotrophic organisms that live parasitically as saprobes, including MUSHROOMS; YEASTS; smuts, molds, etc. They reproduce either sexually or asexually, and have life cycles that range from simple to complex. Filamentous fungi, commonly known as molds, refer to those that grow as multicellular colonies.	Fungi, Filamentous,Molds,Filamentous Fungi,Filamentous Fungus,Fungus,Fungus, Filamentous,Mold
D005659	Fungicides, Industrial	Chemicals that kill or inhibit the growth of fungi in agricultural applications, on wood, plastics, or other materials, in swimming pools, etc.	Industrial Fungicides
D013329	Structure-Activity Relationship	The relationship between the chemical structure of a compound and its biological or pharmacological activity. Compounds are often classed together because they have structural characteristics in common including shape, size, stereochemical arrangement, and distribution of functional groups.	Relationship, Structure-Activity,Relationships, Structure-Activity,Structure Activity Relationship,Structure-Activity Relationships
D014908	Triticum	A plant genus of the family POACEAE that is the source of EDIBLE GRAIN. A hybrid with rye (SECALE CEREALE) is called TRITICALE. The seed is ground into FLOUR and used to make BREAD, and is the source of WHEAT GERM AGGLUTININS.	Wheat,Durum Wheat,Triticum aestivum,Triticum durum,Triticum spelta,Triticum turgidum,Triticum turgidum subsp. durum,Triticum vulgare,Durum Wheats,Wheat, Durum
D050257	Tubulin Modulators	Agents that interact with TUBULIN to inhibit or promote polymerization of MICROTUBULES.	Microtubule Modulator,Tubulin Inhibitor,Tubulin Modulator,Tubulin Polymerization Inhibitor,Tubulin Polymerization Promoter,Tubulin Promoter,Microtubule Modulators,Tubulin Inhibitors,Tubulin Polymerization Inhibitors,Tubulin Polymerization Promoters,Tubulin Promoters,Inhibitor, Tubulin,Inhibitor, Tubulin Polymerization,Inhibitors, Tubulin,Inhibitors, Tubulin Polymerization,Modulator, Microtubule,Modulator, Tubulin,Modulators, Microtubule,Modulators, Tubulin,Polymerization Inhibitor, Tubulin,Polymerization Inhibitors, Tubulin,Polymerization Promoter, Tubulin,Polymerization Promoters, Tubulin,Promoter, Tubulin,Promoter, Tubulin Polymerization,Promoters, Tubulin,Promoters, Tubulin Polymerization