Relationship between Structure and Phytogrowth-Inhibitory Activity of 2,5-Dihydroxy-1,4-dithiane-Related Compounds.
作者:Yoshihiko INAMORI、Chikaaki MURO、Hirofumi OHISHI、Katsushiro MIYAMOTO、Hiroshi TSUJIBO、Kimiye BABA
DOI:10.1248/cpb.40.536
日期:——
Ten derivatives (II-VI and VIII-XII) from 2, 5-dihydroxy-1, 4-dithiane (I) and 2, 5-dihydroxy-2, 5-dimethyl-1, 4-dithiane (VII) showed inhibitory activity against the growth of root of Brassica rapa L. The inhibitory activity of all ten derivatives was higher than that of the original compounds I and VII. In particular, VIII-XII inhibited the germination of this plant at the concentration of 1.0×10-3M. Among the derivatives VIII-XII, IX exhibited the strongest inhibition. Compound III had the most potent inhibitory activity among the derivatives II-VI. The results indicate that acylation of hydroxyl group with propionic acid enhances the activity. The inhibitory effect of VIII-XII was much stronger than that of II-VI. The findings suggest that methyl groups at 2, 5 dipositions play an important role in the inhibitory activity of 2, 5-dihydrosy-1, 4-dithiane-related compounds. In both derivatives II-VI and VIII-XII, the inhibitory effect of the substituent was in the order of propionyl > acetyl > butyryl > valeryl > isobutyryl. All radicles of this plant treated with the compounds I-XII showed negative geotropism.
来自2,5-二羟基-1,4-二硫杂环己烷(I)和2,5-二羟基-2,5-二甲基-1,4-二硫杂环己烷(VII)的十个衍生物(II-VI和VIII-XII)显示出对芸苔(Brassica rapa L.)根部生长的抑制活性。所有十个衍生物的抑制活性均高于原始化合物I和VII。特别是,VIII-XII在1.0×10^-3 M浓度下抑制了该植物的发芽。在衍生物VIII-XII中,IX表现出最强的抑制作用。在衍生物II-VI中,化合物III具有最强的抑制活性。结果表明,用丙酸对羟基进行酰化可以增强活性。VIII-XII的抑制效果远强于II-VI。这些发现表明,在2,5位上的甲基基团对2,5-二羟基-1,4-二硫杂环己烷相关化合物的抑制活性起着重要作用。在衍生物II-VI和VIII-XII中,取代基的抑制效果顺序为丙酰基>乙酰基>丁酰基>戊酰基>异丁酰基。所有用化合物I-XII处理的该植物根系均表现出负向地性。