active clusters, which encouraged us to synthesize further dibenzyl-α-diphenyl-OPP derivatives that elicited pronounced cell killing. Further structure–activity relationships showed the relevance of hydrophobicity and the position of substituents on the main benzene ring as determinants of toxicity. The most active analogs proved to be equally, or even more toxic to the multidrug resistant (MDR) cell line
Knoevenagel condensation reaction of an aldehyde and Meldrum's acid produces a 5-arylmethylidene Meldrum's acid, which undergoes Michael addition of a trialkyl phosphite under solvent-free conditions to afford the title compounds in good yields.
Synthesis and herbicidal activity of O,O-dialkyl phenoxyacetoxyalkylphosphonates containing fluorine
作者:Ting Chen、Ping Shen、Yanjun Li、Hongwu He
DOI:10.1016/j.jfluchem.2005.11.013
日期:2006.2
A series of substituted phenoxyacetoxyalkylphosphonates bearing fluorine were designed and synthesized. All the new compounds were identified by elemental analysis, IR, 1H NMR and MS and were tested for herbicidal activity in greenhouse at a rate of 1.5 kg/ha. The results of preliminary bioassay showed that fluorine moiety introduced to the core structure could help to improve the herbicidal activity
设计并合成了一系列带有氟的取代苯氧基乙酰氧基烷基膦酸酯。通过元素分析,IR,1 H NMR和MS鉴定了所有新化合物,并以1.5 kg / ha的速率测试了温室中的除草活性。初步生物测定的结果表明,引入核心结构的氟部分可以帮助提高除草活性,苯环中带有3-三氟甲基的化合物表现出更高的抑制活性。
Magnetic Fe<sub>3</sub>O<sub>4</sub>Nanoparticle-Supported Phosphotungstic Acid as a Recyclable Catalyst for the Kabachnik-Fields Reaction of Isatins, Imines, and Aldehydes under Solvent-Free Conditions
作者:Mohd Nazish、S. Saravanan、Noor-ul H. Khan、Prathibha Kumari、Rukhsana I. Kureshy、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1002/cplu.201402191
日期:2014.9.22
reaction of isatins, imines, and aldehydes using dimethyl and diethylphosphite as a nucleophile to give the corresponding α‐hydroxy and α‐amino phosphonates in excellent yields for a wide range of substrates. The reaction conditions were simple, green, and efficient. The catalyst was recycled up to five times with retention of its activity. Based on the NMR spectroscopy studies, a probable catalytic cycle