N'-Chlorophenyl- and N'-chlorobenzyl-N-furfuryloxamides (6b-e and 7b-d) were synthesized through the reaction of chloro-substituted anilines (12b-e) or chloro-substituted benzylamines (13b-d) with N-furfuryloxamic acid sodium salt (10), which was prepared via condensation of methyl oxalate (8) with furfurylamine, followed by hydrolysis of the resulting amide-ester with sodium hydroxide. The activity of the prepared compounds (6 and 7) as plant growth regulators was examined by a germination assay using rape and leek seeds.N'-(3-Chlorophenyl)-N-furfuryloxamide (6c) showed a little effectiveness as an inhibitor, whereas the parent compound, N'-phenyl-N-furfuryloxamide (6a) inhibited the root growth of rape seedlings. The 2-chlorophenyl derivative (6b) inhibited the root growth of rape seedlings as potently as 6a, but sufficiently promoted the root growth of leek seedlings. Further, the 4-chlorophenyl derivative (6d) promoted the root growth of both species. On the other hand, in the series of chlorinated benzyl derivatives (7b-d), N'-(3-chlorobenzyl)-N-furfuryloxamide (7c) showed a markedly superior inhibitory effect in both species, but 2- and 4-chlorobenzyl derivatives (7b and 7d) inhibited the root growth of only rape seedlings.
通过
氯代
苯胺(12b-e)或
氯代
苄胺(13b-d)与 N-糠酰氧
肟酸钠盐(10)反应合成了 N'-
氯苯基和 N'-
氯苄基-N-糠酰氧
肟(6b-e 和 7b-d),后者是通过
草酸甲酯(8)与
糠胺缩合,然后用
氢氧化钠水解生成的酰胺酯制备的。N'-(3-
氯苯基)-N-糠酰草胺(6c)作为一种
抑制剂显示出很小的效力,而母体化合物 N'- 苯基-N-糠酰草胺(6a)则抑制油菜幼苗根部的生长。2-chlorophenyl 衍
生物(6b)对油菜幼苗根系生长的抑制作用不亚于 6a,但却能充分促进韭菜幼苗的根系生长。此外,4-
氯苯基衍
生物(6d)对这两种植物的根系生长都有促进作用。另一方面,在
氯化苄基衍
生物系列(7b-d)中,N'-(
3-氯苄基)-N-糠基环氧酰胺(7c)对两种植物的抑制作用都很明显,但 2-和 4-
氯苄基衍
生物(7b 和 7d)只抑制油菜幼苗的根系生长。