Facile Synthesis and Biological Evaluation of Novel N-Nitro Urea Derivatives Incorporating Amino Acid Ethyl Esters

Abstract

A novel series of N-nitro urea derivatives 6a-w containing various amino acid ethyl esters were conveniently synthesized via three steps including nitration, carbamic chlorination, and aminolysis reactions. The structures of all compounds prepared have been confirmed by 1H NMR, IR spectroscopy and elemental analyses, and a part has been identified by 13C NMR. The preliminary bioassay indicates that some of the target compounds possesses moderate herbicidal activity against Echinochloa crusgalli and Amaranthus albus. However, some of the title compounds presented high plant growth regulating activity against rice.