Novel 4-Methylumbelliferone Amide Derivatives: Synthesis, Characterization and Pesticidal Activities.

A series of novel 4-methylumbelliferone amide derivatives were designed, synthesized and characterized by ¹H NMR, 13 C NMR and HR-ESI-MS. The structures of compounds 4bd and 4be (compounds named by authors) were further confirmed by X-ray single crystal diffraction. The acaricidal, herbicidal and antifungal activities of the synthesized compounds were assayed for their potential use as pesticide. The results indicated that compounds 4bi , 4ac and 4bd were strong acaricidals against Tetranychus cinnabarinus , with 72h corrected mortalities of greater than 80% at 1000 mg/L. Meanwhile, compounds 4bh and 4bf exhibit the strongest inhibition against the taproot development of Digitaria sanguinalis and Chenopodium glaucum , and were even more potent than the commercial herbicide Acetochlor against D. sanguinalis . In addition, compounds 4bk , 4bh and 4bp showed the highest antifungal activity against the mycelium growth of Valsa mali , which makes them more effective than commercial fungicide Carbendazim.