Synthesis and photosynthetic inhibition activity of substituted 5-(bis-trifluoromethyl)methyl)-2-aminothiazoles

The reaction of 5,5,5-trifluoro-4-trifluoromethyl-pent-3-en-2-one with aminothiocarbonyls yielded aminothiourea precursors which readily cyclised to the corresponding thiazole derivatives, 5-(bis-trifluoromethyl)methyl)-2-aminothiazoles. The inhibitory potency of photosystem II activity of these thiazoles was evaluated using fluorescence measurement techniques. Two of the compounds showed a good activity in comparison with the reference compound DCMU, 3-(3,4-dichlorophenol)-1,1-dimethylurea. Calculation of lipophilicity according to Rekker and Frey, and a corresponding experimental determination are reported.