Design, synthesis, and biological activity of novel 4-(3,4-dimethoxyphenyl)-2-methylthiazole-5-carboxylic acid derivatives.

Novel 4-(3,4-dimethoxyphenyl)-2-methylthiazole-5-carboxylic acid derivatives (11-23) were synthesized from 3,4-dimethoxyacetophenone (5) in six-step procedure. Their biological activities were evaluated in the greenhouse. Some of the compounds had shown fungicidal and insecticidal activities at 375 g ai/ha and 600 g ai/ha, respectively.