Design, synthesis and herbicidal activity of new iron chelating motifs for HPPD-inhibitors.

Abstract:

:HPPD (p-hydroxyphenylpyruvate dioxygenase) is a herbicidal target that all major companies active in plant protection research have worked on intensely in the last decade. Several modern herbicides with this mode of action have been introduced recently, or are currently in development. The activity of all commercialized HPPD-inhibitors is based on a chelating functionality, which binds to the redoxactive iron center in the enzyme. In the course of our research, leading to the new broad spectrum corn herbicide topramezone by BASF, this chelating functionality has been examined thoroughly, and many new chelating motifs have been synthesized. The chelating motif N-O in combination with C=O, which is known for its iron-binding potential from many natural siderophores, was especially promising. Examination of several different motifs of this type resulted in the identification of benzoyl-N-hydroxyimidazoles, which inhibited the HPPD-enzyme with potency comparable to the best known systems. Significant herbicidal activity in the greenhouse could also be identified for some of these compounds, but this activity was weaker than for the analogous benzoylpyrazolones of the topramezone-type.

journal_name

Bioorg Med Chem

authors

Witschel M

doi

10.1016/j.bmc.2008.11.006

subject

Has Abstract

pub_date

2009-06-15 00:00:00

pages

4221-9

issue

12

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(08)01060-2

journal_volume

17

pub_type

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