N-Sulfonyl Amino Acid Amides, a Novel Class of Compounds with Fungicidal Activity [1]

Novel types of oomycete fungicides have been designed and prepared. The synthetic approach to these N-sulfonyl amino acid amides is outlined. Bioassays demonstrate their high efficacy against important plant diseases like Phytophthora infestans (tomato and potato late blight) and Plasmopara viticola (grape downy mildew). Structure–activity relationship studies are discussed

Azine Derivatives as a New Generation of Insect Growth Regulators

A new generation of insect-growth-regulator insecticides, the azines, are presented. They inhibit the chitin biosynthesis process and are active against lepidopteran pests. Their synthesis and a structure–activity relationship will be discussed

Applications of Parallel Synthesis to Lead Optimization

Parallel synthesis of focused compound libraries for hit confirmation and lead optimization are certainly important drivers for shortening the lead discovery phase in the pharmaceutical and crop protection industries. In this article we show with permission of Roche and Syngenta three real case studies where Polyphor synthesized focused libraries for lead validation and optimization using high-throughput parallel synthesis and purification techniques. The three examples differ significantly in the synthetic strategies which were employed as well as in the chemical complexity of the final products. A multigeneration approach towards insecticidal triazines, the application of a sequential three-component reaction towards insecticidal and fungicidal thiazoles and finally a multistep synthesis approach of advanced building blocks followed by a two-step final derivatization towards novel antiviral N-hydroxy-indolin-2-ones are presented. In all cases 100–200 analogues were synthesized using parallel synthesis in solution followed by purification of the final products by parallel flash or high-throughput (unattended) HPLC (coupled to MS) within four months. Promising biological results were obtained in all three cases