Solution-Phase Parallel Syntheses of Herbicidal 1-Phenyl-2,4,5- Imidazolidinetriones and 2-Thioxo-4,5-Imidazolidinediones
作者:Bin Li、Ying Man、Li-Ping Bai、Hai-Ying Ji、Xue-Geng Shi
DOI:10.2174/1386207311301010010
日期:2013.1.1
In order to find new herbicidally active compounds, a fifteen-member library, focusing on the variation of 3-
position substituents of 2,4,5-imidazolidine-trione or 2-thioxo-4,5-imidazolidinedione, was designed and prepared in
parallel by the reaction of various ureas or thioureas with oxalyl chloride using solution-phase technology. An interesting
and, to the best of our knowledge, unprecedented finding is that a by-product of 1-phenyl-3-propylcarbodiimide was
formed during the addition of oxalyl chloride into the solution of 1-phenyl-3-propylthiourea in the presence of
triethylamine in dichloromethane. It has been shown that the herbicidal activity of 2,4,5-imidazolidinetriones is about the
same as that of their analogous 2-thioxo-4,5-imidazolidinediones. Compound with propyl or isopropyl group at the 3-
position of 2,4,5-imidazolidinetrione ring demonstrated good herbicidal activity. The most active compound, 1-(2-fluoro-
4-chloro-5-propargyloxy)-phenyl-3-propyl-2-thioxo-4,5-imidazolidinedione, gave 95% control of the growth of velvetleaf
at 200 g/ha in the post-emergence test.
为了寻找新的具有除草活性的化合物,我们设计了一个由 15 个成员组成的化合物库,该化合物库侧重于 2,4,5-咪唑烷-三酮或 2-硫酮-4,5-咪唑烷二酮的 3 位取代基的变化,并采用溶液相技术,通过各种脲类或硫脲类化合物与草酰氯的反应进行平行制备。据我们所知,一个有趣的、前所未有的发现是,在二氯甲烷中有三乙胺存在的情况下,草酰氯加入 1-苯基-3-丙基硫脲的溶液中,形成了 1-苯基-3-丙基碳二亚胺的副产物。研究表明,2,4,5-咪唑烷三酮的除草活性与类似的 2-硫酮-4,5-咪唑烷二酮的除草活性大致相同。在 2,4,5-咪唑烷三酮环的 3-位上带有丙基或异丙基的化合物具有良好的除草活性。最有效的化合物是 1-(2-氟-4-氯-5-丙酰氧基)-苯基-3-丙基-2-硫酮-4,5-咪唑烷二酮,在萌发后试验中,每公顷用量为 200 克时,对绒毛菜生长的控制率为 95%。