Plant-growth inhibitory activity of heliannuol derivatives
摘要:
In addition to (+)-, (-)- and (+/-)-heliannuol E, growth-inhibitory activities of five synthetic chromans and four tetrahydrobenzo[b]oxepins were examined against oat and cress. All heliannuol E isomers exhibited similar biological activities against cress, whereas when tested against oat roots, the unnatural optical isomer (+) showed no inhibitory activity. Four brominated chromans and two tetrahydrobenzo[b]oxepin derivatives also showed apparent inhibition against both cress and oat. (C) 2004 Elsevier Ltd. All rights reserved.
A heliannane-type sesquiterpene, heliannuol E (1), has been successfully synthesized. The key step was conversion of the electrochemically produced spiro compounds (8, and 18) into the corresponding dihydrobenzopyrans (11, 12, 19, and 20) by a selective ring expansion process.
已成功合成了一种向日葵型倍半萜烯,向日葵 E (1)。关键步骤是通过选择性扩环过程将电化学产生的螺环化合物(8 和 18)转化为相应的二氢苯并吡喃(11、12、19 和 20)。
Synthesis of Chroman Derivatives by the Ring Expansion Reaction of Spirodienones, and an Assessment of their Plant Growth Inhibition
Lewis acid-promoted 1,2-shift rearrangement reactions of the spirodienones, generated by the anodic oxidation of phenol derivatives, provided corresponding chromans. In addition to steric repulsion...
In addition to (+)-, (-)- and (+/-)-heliannuol E, growth-inhibitory activities of five synthetic chromans and four tetrahydrobenzo[b]oxepins were examined against oat and cress. All heliannuol E isomers exhibited similar biological activities against cress, whereas when tested against oat roots, the unnatural optical isomer (+) showed no inhibitory activity. Four brominated chromans and two tetrahydrobenzo[b]oxepin derivatives also showed apparent inhibition against both cress and oat. (C) 2004 Elsevier Ltd. All rights reserved.