Efficient synthesis of new butenolides by subsequent reactions: application for the synthesis of original iminolactones, bis-iminolactones and bis-lactones
We have developed the synthesis of twenty four new iminolactones, bis-iminolactones and bis-lactones by subsequent esterification–condensation or addition–condensation reactions according to two strategies from α-hydroxyketones. The X-ray diffraction data of a bis-iminolactone is described and present an interesting helical column packing.
Interactions of aliphatic β-amino-β-trifluoromethylvinyl ketones with ethylenediamine
作者:V. Ya. Sosnovskikh、M. Yu. Mel'nikov、I. A. Kovaleva
DOI:10.1007/bf02494288
日期:1998.11
The reactions of aliphatic β-amino-β-trifluoromethylvinyl ketones with an excess of ethylenediamine at room temperature afforded the corresponding 2,3-dihydro-1H-1,4-diazepines or substituted 2-acetonyl-2-trifluoromethylimidazolidines (the latter were obtained when the approach to the carbonyl group was sterically hindered).
Ag<sup>I</sup>
/TMG-Promoted Cascade Reaction of Propargyl Alcohols, Carbon Dioxide, and 2-Aminoethanols to 2-Oxazolidinones
作者:Xue-Dong Li、Qing-Wen Song、Xian-Dong Lang、Yao Chang、Liang-Nian He
DOI:10.1002/cphc.201700297
日期:2017.11.17
the conventional 2‐aminoethanol/CO2 coupling was ameliorated. Mechanistic investigations including control experiments, DFT calculation, kinetic and NMR studies suggest that the reaction proceeds through a cascade pathway and TMG could activate propargyl alcohol and 2‐aminoethanol through the formation of hydrogen bonds and also activate CO2.
从可持续化学的角度来看,对CO 2进行化学增值以获取各种增值化合物一直是一项长期且具有挑战性的目标。在此,开发了一种末端三炔丙醇,CO 2和2-氨基乙醇的单锅三组分反应方法,用于合成2-恶唑烷酮和由Ag 2 O / TMG促进的等量α-羟基酮(1, 1,3,3-四甲基胍)的TON(周转数)高达1260。通过添加末端炔丙醇,是常规2-氨基乙醇/ CO 2的热力学缺点。耦合得到改善。包括控制实验,DFT计算,动力学和NMR研究在内的机理研究表明,该反应通过级联途径进行,而TMG可以通过氢键的活化来活化炔丙醇和2-氨基乙醇,还可以活化CO 2。
Cobaltocene-Catalyzed Reaction of Carbon Dioxide with Propargyl Alcohols
The reaction of carbon dioxide with α-ethynyl tertiary alcohols has been catalyzed by cobaltocene to give α-methylene cyclic carbonates in good yields. α-Ethynyl primary or secondary alcohols give noncyclic alkyl carbonates in fair yields.