The reaction of dialkyl acetylenedicarboxylates with 2-oxo-2-phenylacetaldehyde in the presence of primary amines: synthesis of alkyl 2-benzoyl-4-alkylamino-5-oxo-2,5-dihydro-3-furan carboxylate derivatives
A novel and facile one-pot reaction has been developed to synthesize a variety of penta-substituted pyrroles from α-nitroepoxides, primary amines and dialkyl acetylenedicarboxylates under the conditions without catalyst. Furthermore, the controlled experiments has been performed and a possible mechanism has also been proposed.
An expedient synthesis strategy to the 1,4-dihydropyridines and pyrido[1,2-a]quinoxalines: iodine catalyzed one-pot four-component domino reactions
作者:Atieh Rezvanian
DOI:10.1016/j.tet.2016.08.049
日期:2016.10
achieved. The synthesis involves reaction of the intermediates formed by the 1:1 interaction between primary amines (or o-phenylenediamine) and dialkyl acetylenedicarboxylate with pyruvic acid and benzaldehyde through an iodine-catalyzed Knoevenagel/Michael/cyclization sequence. The reaction is particularly attractive due to the following advantages: atom economy, optimum convergence, high bond-forming efficiency
已经描述了有关烯胺酮化学的另一个方面,该化学导致一锅合成功能化的新型1,4-二氢吡啶和吡啶并[1,2- a ]喹喔啉。通过高效的一锅碘催化的四组分反应,通过两种方法将一组烯胺中间体和亚芳基丙酮酸(APA)结合在一起,可以实现杂环骨架的多样性。合成涉及由伯胺(或邻胺)之间的1:1相互作用形成的中间体反应(苯二胺)和乙二酸二烷基酯与丙酮酸和苯甲醛通过碘催化的Knoevenagel / Michael /环化序列进行合成。由于以下优点,该反应特别有吸引力:原子经济,最佳收敛,高键形成效率以及避免繁琐的后处理和产物纯化。值得注意的是,在产品9位上的酸性基团的存在使这些化合物成为进一步合成修饰的优异前体,以满足各种化学输入的需要。
The reaction of dialkyl acetylenedicarboxylates with 2-oxo-2-phenylacetaldehyde in the presence of primary amines: synthesis of alkyl 2-benzoyl-4-alkylamino-5-oxo-2,5-dihydro-3-furan carboxylate derivatives
A 3-component domino reaction approach between a primary amine, a dialkyl acetylenedicarboxylate, and 2-oxo-2- phenylacetaldehyde that affords novel alkyl 2-benzoyl-4-alkylamino- 5-oxo-2,5-dihydro-3-furan carboxylate derivatives is reported. The reaction sequence consists of an initial Michael addition of primary amines to dialkyl acetylenedicarboxylates, followed by an aldol-like reaction with 2-oxo-2-phenylacetaldehyde, and then \gamma -lactonization to afford the products. This cascade reaction sequence represents a rapid and unprecedented route to the described biologically interesting molecules.
Catalyst-free synthesis of functionalized dihydro-2-oxypyrroles by the reaction of enaminones and N,N′-bis(phenylmethylidene)phenylmethane
作者:Abdolali Alizadeh、Javad Mokhtari、Long-Guan Zhu
DOI:10.1016/j.crci.2013.01.020
日期:2013.10
Résumé A catalyst-free and convenient approach for the preparation of substituted dihydro-2-oxypyrrole is described. This three-component reaction between primary amines, dialkyl acetylenedicarboxylate, and N,N′-bis(phenylmethylidene)phenylmethane proceeds in MeOH under reflux conditions in good to excellent yields.