Herbicidal aryldiones incorporating a 5-methoxy-[1,2,5]triazepane ring

Area of Science:

• Agricultural Chemistry
• Organic Synthesis
• Plant Science

Background:

• Development of selective herbicides is crucial for sustainable agriculture.
• Acetyl-CoA carboxylase (ACCase) inhibitors are vital for controlling grass weeds in cereal crops.
• Novel chemical scaffolds are needed to overcome herbicide resistance.

Purpose of the Study:

• To synthesize and evaluate novel 2-aryl-cyclic-1,3-diones with a 5-methoxy-[1,2,5]triazepane unit.
• To investigate their efficacy as grass weed control agents in wheat.
• To elucidate structure-activity relationships (SAR) and understand their mode of action.

Main Methods:

• Synthesis of 7-membered heterocyclic [1,2,5]triazepane building blocks.
• Preparation of novel 2-aryl-cyclic-1,3-dione derivatives.
• Evaluation of herbicidal activity against grass weeds in wheat.
• Enzyme inhibition assays and binding site analysis.

Main Results:

• Successful synthesis of novel 2-aryl-cyclic-1,3-diones incorporating the [1,2,5]triazepane moiety.
• Demonstrated effective and wheat-safe control of grass weeds.
• Established SAR consistent with known pinoxaden family ACCase inhibitors.
• Identified the N-methoxy group as a bioisostere of the ether group in the triazepane ring.

Conclusions:

• Novel 2-aryl-cyclic-1,3-diones with a 5-methoxy-[1,2,5]triazepane unit represent a promising class of herbicides.
• These compounds offer a viable strategy for selective grass weed management in wheat.
• The N-methoxy-[1,2,5]triazepane unit provides a valuable scaffold for designing new ACCase inhibitors.