Twenty-nine mercaptotriazinone derivatives were synthesized and their plant growth-promoting activities were examined by the rice (Oryza sativa) seedling test in the presence or absence of gibberellic acid (GA3). For high activity in promoting the GA3-induced shoot elongation, an isopropyl or an appropriately substituted phenyl group, a hydrogen atom and a lower alkyl thio group were required in the 1-, 3-and 4-positions, respectively, of the 1,3,5-triazine-2,6-dione structure. In more detailed experiments, 4-methylthio-1-(p-tolyl)-s-triazine-2,6(1H, 3H)-dione, one of the most potent mercaptotriazinones, was found to synergistically promote the GA3-induced elongation of the first and second leaves of rice seedlings. Several mercaptotriazinone derivatives, active or inactive, in the rice seedling test were examined by the radish (Raphanus sativus) leaf disk expansion test, but all of them were completely inactive. Structure-activity relationships of mercaptotriazinone derivatives are discussed in relation to those of the corresponding alkoxytriazinone derivatives.
合成了29种
硫代
三嗪酮衍
生物,并通过
水稻(Oryza sativa)幼苗测试在有无
赤霉素(
GA3)存在下检查其植物生长促进活性。为了在促进
GA3诱导的茎 elongation 中表现出高活性,1-、3-和4-位的
1,3,5-三嗪-2,6-二酮结构中分别需要存在异丙基或适当取代的苯基、氢原子和低级烷基
硫基。在更加详细的实验中,4-甲
硫基-1-(对甲基苯基)-s-三嗪-2,6(1H, 3H)-二酮被发现能够协同促进
水稻幼苗第一和第二片叶子的
GA3诱导伸长。通过萝卜(Raphanus sativus)叶盘扩展测试检查了多种在
水稻幼苗测试中显示活性或无活性的
硫代
三嗪酮衍
生物,但它们全部完全无活性。讨论了
硫代
三嗪酮衍
生物的结构-活性关系,并将其与相应的醇氧
三嗪酮衍
生物的关系进行了比较。