根据鱼腥草素和β-内酰胺类抗生素的化学结构,设计合成了一系列新型的4-烷基苯基β-醛酮及其衍生物。研究了这些化合物的抗菌活性。结果表明,所测试的大多数化合物对革兰氏阳性病原体金黄色葡萄球菌(ATTC-25923)的抑制作用均比Houttuynin大,而革兰氏阳性菌比革兰氏阴性菌更容易受到该化合物的影响。发现化合物23是最有效的化合物,对金黄色葡萄球菌的MIC为1.0μg/ mL 。特别是,化合物16,22和23在临床上重要的病原细菌,耐甲氧西林的金黄色葡萄球菌(MRSA)表现出比Houttuynin和左氧氟沙星更强的抗菌活性。初步的结构-活性关系(SAR)分析表明:(1)在苯环的4位引入合适的烷基取代基可增强这些化合物的抗菌活性,而异丙基取代基可能更有利;(2)酮羰基部分的存在可能在确定这些化合物的显着抗菌活性中起着至关重要的作用。
Organische Phosphorverbindungen, I. Synthese und reaktives Verhalten vinyloger Phosphorsäureacylester
作者:Gerhard W. Fischer、Peter Schneider
DOI:10.1002/cber.19731060210
日期:1973.2
chlorid und 2-Hydroxyvinylketon-Natriumsalzen resultierende Phosphorsäure-(2-acylvinylester) 6 unterliegen einer spontanen Disproportionierung zu Pyrophosphorsäure-tetraäthylester (TEPP) 7 und Bis(2-acylvinyl)äthern 8. Ähnlich verhalten sich die in Substanz isolierbaren Phosphorsäure-diphenylester-(2-acylvinylester) 12. Verbindungen dieses Typs reagieren mit Nucleophilen im Sinne vinyloger Phosphorsäureacylester:
Mechanistic and Exploratory Investigations into the Synthesis of 1,3,5-Triaroylbenzenes from 1-Aryl-2-propyn-1-ones and 1,3,5-Triacetylbenzene from 4-Methoxy-3-buten-2-one by Cyclotrimerization in Hot Water in the Absence of Added Acid or Base
intermediate for the formation of 2, 2′ and the acetophenone derivatives as byproducts. When 4-methoxy-3-buten-2-one (4) was heated in hot pure water without any additive at 150 °C for 30 min, 1,3,5-triacetylbenzene (5) was obtained in an isolated yield of 77% just by removing water by filtering the crystalline product from the cooled reaction mixture. The reaction did not take place in the absence of
Effect of Diamine Bridge on Reactivity of Tetradentate ONNO Nickel(II) Complexes
作者:Kamila Pruszkowska、Olga A. Stasyuk、Anna Zep、Adam Krówczyński、Rafal R. Sicinski、Miquel Solà、Michał K. Cyrański
DOI:10.1002/cphc.202100741
日期:2022.1.19
C2 or C3? Comparison of two synthesized and characterized square planar Ni(II) complexes showed that the length of the diamine bridge in the equatorial ligand plays a crucial role in the reaction with N-heterocyclic aromatic amines. Only complex with propylenediamine bridge attaches pyridine derivatives switching from square planar low-spin to octahedral high-spin structure.