Synthesis and Herbicidal Activity of Novel 3-Aminocarbonyl-2-oxazolidinethione Derivatives Containing a Substituted Pyridine Ring

A series of 3-aminocarbonyl-2-oxazolidinethione derivatives containing a substituted pyridine ring were designed and synthesized. The structures of all of the title compounds were characterized by 1H NMR, 13C NMR, IR, and HRMS. Their agricultural bioactivities were evaluated, and some of these compounds exhibited good herbicidal activities against Echinochloa crusgalli, Sorghum vulgare, Digitaria sanguinalis, Eclipta prostrasta, Cucumis sativus, and Brassica campestris, which were associated mainly with their steric properties and lipophilicities based on the structure−activity relationship discussion. Keywords: 2-Oxazolidinethiones; pyridine ring; herbicidal activity