Synthesis and Herbicidal Evaluation of Novel 3-[(α-Hydroxy-substituted)benzylidene]pyrrolidine-2,4-diones
作者:Youquan Zhu、Xiaomao Zou、Fangzhong Hu、Changsheng Yao、Bin Liu、Huazheng Yang
DOI:10.1021/jf051510l
日期:2005.11.1
aroyl acetates with N-substituted glycine esters. The new compounds were identified by 1H NMR spectroscopy and elemental analyses. Their herbicidalactivities were evaluated. Some compounds exhibited excellent herbicidalactivities at a dose of 187.5 g/ha. A suitable electron-donating substituent at the 2- and/or 4-position of the phenyl ring was essential for high herbicidalactivity, a result that has
通过使不同的芳酰乙酸酯与N-取代的甘氨酸酯反应,合成了一系列3-[((α-羟基-取代的)亚苄基]吡咯烷-2,4-二酮衍生物作为候选除草剂。通过1H NMR光谱和元素分析鉴定了这些新化合物。对它们的除草活性进行了评估。一些化合物在187.5 g / ha的剂量下表现出优异的除草活性。在苯环的2位和/或4位上合适的供电子取代基对于高除草活性是必不可少的,这一结果以前没有报道。还发现标题化合物的结构-活性关系不同于其他类似种类的较早化合物,其结果可能取决于烯醇结构的不同。
A Quantitative Structure−Activity Relationship Study of Herbicidal Analogues of α-Hydroxy-Substituted 3-Benzylidenepyrrolidene-2,4-diones
作者:You-quan Zhu、Pei Liu、Xue-Kai Si、Xiao-Mao Zou、Bin Liu、Hai-Bin Song、Hua-zheng Yang
DOI:10.1021/jf061573j
日期:2006.9.1
A series of pyrrolidine-2,4-dione and piperidine-2,4-dione derivatives were prepared and evaluated for their herbicidal activities where some of these compounds exhibited good bioactivity against Echinochloa crus-galli in comparison with sulcotrione. Quantitative structure- activity relationship studies were performed on these compounds using physicochemical parameters ( hydrophobic, electronic, and Taft) as independent parameters and herbicidal activity as a dependent parameter, where herbicidal activity correlated best (r > 0.8) with hydrophobic (pi degrees + pi(p)), steric (Es), STERIMOL (B4), indicator (H-M), van der Waals volume (V), and electronic parameter (sigma(m) + sigma(p)) in this set of molecules; the optimum van der Waals volume for R-2 is about 41.8 A(3); when B4 is equal to 3, the target molecule possessed the lowest herbicidal activity.
Collective Total Synthesis of 4‐Azafluorenone Alkaloids
作者:Ilya A. P. Jourjine、Franz Bracher
DOI:10.1002/ejoc.202300399
日期:2023.7.21
Previous approaches to 4-azafluorenone alkaloid syntheses featuring 2-arylnicotinates are supplemented with tert-butyl hydroperoxide-mediated radical cyclization and/or bromine substituents as latent hydroxy groups which allows for flexible synthesis of highly oxygenated 4-azafluorenone alkaloids, including 5-oxygenated derivatives inaccessible via conventional Friedel-Crafts-type cyclization of 2-arylnicotinates