1. C--H arylation enables synthesis of imidazole-4-carboxamide (ICA) based fairy chemicals with plant growth-promoting activity
- Author
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Ueda, Ayaka, Amaike, Kazuma, Shirotani, Yoko, Warstat, Robin, Ito, Hideto, Choi, Jae-Hoon, Kawagishi, Hirokazu, and Itami, Kenichiro
- Subjects
Amides -- Identification and classification -- Properties ,Imidazole -- Identification and classification -- Properties ,Carboxylic acids -- Identification and classification -- Properties ,Chemical synthesis -- Methods -- Analysis ,Chemistry - Abstract
Imidazole-4-carhoxamide (ICA), which is one of the groups of 'fairy chemicals' (FCs) that cause the fairy ring phenomena, has plant growth inhibitory activity. FCs have the potential as candidates for a new family of plant hormones as they have been found endogenously in all plant species tested and show growth-regulating activities against the plants. While basic research on FCs is progressing, they are also expected to be applied not only to agrochemicals but also as pharmaceuticals. Derivatization of one of the FCs, 2-azahypoxanthine, and the structure-activity relationship (SAR) studies have clarified its activity as a plant growth promoter. Yet, ICA has not been derivatized at all and SAR regarding its activity remains unknown. In this study we synthesized the derivatives of ICA by direct C--H arylation of ICA precursors and evaluated its activity in rice. The 12 total compounds including the arylated ICAs and their precursors were evaluated for root and shoot elongation in rice, resulting in the discovery that a number of compounds unexpectedly have an elongation activity in the root and shoot. Key words: C--H arylation, fairy chemicals, plant growth activity, imidazole-4-carboxamide, 'Fairy rings' is a phenomenon in which ring-shaped thick growths or necrotic spots of grasses occur. Since the first publication of a scientific paper on fairy rings in 1675, (1) [...]
- Published
- 2023
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