Photochemical transformation of a cellulose biosynthesis inhibitor into phytoene desaturase inhibitors.
2021
Abstract Mode of action studies showed that 5-methyl-N,N-bis[6-(trifluoromethyl)pyridin-3-yl]pyridin-2-amine (4), a representative from a new class of herbicidal tris-pyridyl amines, is an inhibitor of cellulose biosynthesis (CB). The compound undergoes an oxidative photocyclization, when exposed to UV-B light (300–340 nm) in the presence of oxygen, to give a new class of herbicidal pyrrolodipyridines. These compounds are potent inhibitors of the herbicide target enzyme phytoene desaturase and no longer inhibit CB.
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