Structure-Activity Relationships of N-benzylsalicylamides for Inhibition of Photosynthetic Electron Transport
作者:Katarina Kralova、Milan Perina、Karel Waisser、Josef Jampilek
DOI:10.2174/1573406410666140815125004
日期:2015.1.30
Inhibition of photosynthetic electron transport (PET) in spinach chloroplasts by sixty-one ring-substituted
N-benzylsalicylamides was investigated. The inhibitory potency of the compounds expressed by IC50 value varied from
2.0 to 425.3 μmol/L. Several evaluated compounds can be considered as effective PET inhibitors; these include N-(3,4-
dichlorobenzyl)-2-hydroxy-5-nitrobenzamide (IC50 = 2.0 μmol/L), 3,5-dibromo-N-(3,4-dichlorobenzyl)-2-hydroxybenzamide
(IC50 = 2.3 μmol/L) and 3,5-dibromo-N-(4-chlorobenzyl)-2-hydroxybenzamide (IC50 = 2.6 μmol/L) with activity
comparable with that of the standard Diuron (IC50 = 1.9 μmol/L). The PET inhibiting activity increased approximately
linearly with increasing lipophilicity of the compounds as well as with the increasing sum of Hammett σ constants of the
substituents on the acyl fragment (R1 = H, 5-OCH3, 5-CH3, 5-Cl, 5-Br, 5-NO2, 4-OCH3, 4-Cl, 3,5-Cl and 3,5-Br) and the
benzylamide fragment (R2 = H, 4-OCH3, 4-CH3, 4-F, 4-Cl and 3,4-Cl). Based on the evaluated structure-PET inhibiting
activity relationships (QSAR) it was confirmed that the inhibitory activity of the compounds depends on lipophilicity
(log P or distributive parameters π 1 and ▂of individual substituents) and electronic properties of the substituents on the
acyl (σ1) and the benzylamide fragments (σ2), the contribution of σ1 being more significant than that of σ2.
研究了61种环取代的N-苄基水杨酰胺对菠菜叶绿体中光合电子传递(PET)的抑制作用。这些化合物的抑制能力以IC50值表示,范围从2.0到425.3 μmol/L。评估的化合物中有几种可被视为有效的PET抑制剂;其中包括N-(3,4-二氯苄基)-2-羟基-5-硝基苯甲酰胺(IC50 = 2.0 μmol/L)、3,5-二溴-N-(3,4-二氯苄基)-2-羟基苯甲酰胺(IC50 = 2.3 μmol/L)和3,5-二溴-N-(4-氯苄基)-2-羟基苯甲酰胺(IC50 = 2.6 μmol/L),这些活性与标准敌草隆(IC50 = 1.9 μmol/L)相当。PET抑制活性随着化合物亲脂性的增加以及酰基片段(R1 = H, 5-OCH3, 5-CH3, 5-Cl, 5-Br, 5-NO2, 4-OCH3, 4-Cl, 3,5-Cl和3,5-Br)和苄胺片段(R2 = H, 4-OCH3, 4-CH3, 4-F, 4-Cl和3,4-Cl)上取代基的Hammett σ常数之和的增加而大致线性增加。基于评估的结构-PET抑制活性关系(QSAR)证实,这些化合物的抑制活性依赖于亲脂性(log P或分布参数π1和▂)以及酰基(σ1)和苄胺片段(σ2)上取代基的电子性质,其中σ1的贡献比σ2更为显著。