A New Carboxylesterase fromBrevibacterium linensIFO 12171 Responsible for the Conversion of 1,4-Butanediol Diacrylate to 4-Hydroxybutyl Acrylate: Purification, Characterization, Gene Cloning, and Gene Expression inEscherichia coli
A process for the conversion of aldehydes to esters, specifically acrolein or methacrolein to methyl acrylate or methyl methacrylate, respectively. Essentially in the absence of water, an aldehyde is contacted with an oxidizing agent to form an intermediate and then the intermediate is contacted with a diol or an alcohol to form an ester or diester. Preferably, the oxidizing agent is also a chlorinating agent. Specifically, acrolein or methacrolein is contacted with an oxidizing/chlorinating agent, such as t-butyl hypochlorite, and the chlorinated compound is contacted with an alcohol, such as methanol, to form methyl acrylate or methyl methacrylate, respectively. Generally, the order of addition is for the oxidizing agent to be added to the aldehyde, specifically for t-butyl hypochlorite to be added to acrolein or methacrolein, and for the diol or alcohol to be added to the intermediate, specifically for the methanol to be added to the reaction product of acrolein or methacrolein and t-butyl hypochlorite. The process of the present invention can be carried out in the absence or in the presence of solvent. Generally, better methyl acrylate or methyl methacrylate yields are obtained at lower reaction temperatures.
Iodine-mediated one-pot synthesis of C-3 acylated indolizines from pyridines, aryl methyl ketones and acrylate derivatives
作者:Youlai Fang、Lisheng He、Weidong Pan、Yuzhu Yang
DOI:10.1016/j.tet.2019.05.058
日期:2019.7
reaction from pyridines, aryl methyl ketones and electron deficient acrylates has been accomplished in a “one-pot” manner, which provides a straightforward and efficient access to C-3 acylated indolizines. The key intermediate of N-ylides is hypothesized to be generated in situ from pyridines and (hetero)aryl methyl ketones in the presence of iodine. This method has been applied in the synthesis of two
A Facile Approach to Bis(isoxazoles), Promising Ligands of the AMPA Receptor
作者:Dmitry A. Vasilenko、Kirill S. Sadovnikov、Kseniya N. Sedenkova、Dmitry S. Karlov、Eugene V. Radchenko、Yuri K. Grishin、Victor B. Rybakov、Tamara S. Kuznetsova、Vladimir L. Zamoyski、Vladimir V. Grigoriev、Vladimir A. Palyulin、Elena B. Averina
DOI:10.3390/molecules26216411
日期:——
convenient synthetic approach to novel functionalized bis(isoxazoles), the promising bivalent ligands of the AMPA receptor, was elaborated. It was based on the heterocyclization reactions of readily available electrophilic alkenes with the tetranitromethane-triethylamine complex. The structural diversity of the synthesized compounds was demonstrated. In the electrophysiological experiments using the patch
详细阐述了一种新型功能化双(异恶唑)(AMPA 受体的有前途的二价配体)的便捷合成方法。它基于易于获得的亲电烯烃与四硝基甲烷-三乙胺络合物的杂环化反应。证明了合成化合物的结构多样性。在浦肯野神经元上使用膜片钳技术的电生理实验中,化合物 1,4-苯二(亚甲基)双(5-氨基异恶唑-3-羧酸盐)被证明是高效的 AMPA 受体正调节剂,增强红藻氨酸诱导的10 -11 M 时电流高达 70% 。