In the present study, using chalcone as a lead compound, a series of its derivatives (compounds 1-30) were designed and synthesised. Their activity of anti-pathogenic fungi of plants has been evaluated. It is found that these compounds have good antifungal activity against Sclerotinia sclerotiorum, Helminthosprium maydis, Botrytis cinerea, Rhizoctonia solani and Gibberella zeae. Among them, the inhibition of growth for compound 30 against S. sclerotiorum showed 89.9%, with the median effective concentrations (EC50) of 15.4gmL(-1). The inhibition of growth for compounds 28, 29 and 30 at a concentration of 100gmL(-1) against H. maydis is 90.3%, 90.7% and 91.1%, with EC50 of 15.1, 18.3 and 18.1gmL(-1), respectively.
Design, Synthesis, and Bioactivities Screening of a Diaryl Ketone-Inspired Pesticide Molecular Library as Derived from Natural Products
Three natural products, 1,5‐diphenylpentan‐1‐one, 1,5‐diphenylpent‐2‐en‐1‐one, and 3‐hydroxy‐1,5‐diphenylpentan‐1‐one, with good insecticidal activities were extracted from Stellera chamaejasme L. Based on their shared diaryl ketone moiety as ‘pharmacophores’, a series of diaryl ketones were synthesized and tested for insecticidal activity, acetylcholinesterase inhibitory activity, and antifungal activity. All synthesized compounds showed poor insecticidal and acetylcholinesterase inhibitory activities. Compound III with a furyl ring showed strong activities against plant pathogenic fungi. The IC50 of compound (E)‐1‐(2,4‐dichlorophenyl)‐3‐(furan‐2‐yl)‐ ‐prop‐2‐en‐1‐one (III2) was 1.20 mg/L against Rhizoctonia solani, suggesting its strong potential as a novel antifungal drug.
Ultrasounds-mediated 10-seconds synthesis of chalcones as potential farnesyltransferase inhibitors
synthesized, following Claisen-Schmidt condensation of (hetero)aryl ketones and (hetero)aryl aldehydes using a ultrasound probe. A comparison was made with classical magnetic stirring experiments, and an optimization study was realized, showing lithium hydroxide to be the best basic catalyst of the studied condensations. By-products of the reactions (β-hydroxy-ketone, diketones, and cyclohexanols) were also