环加成反应已被广泛研究,并为合成环状化合物提供了有效的策略。传统上,反应伙伴被广泛地掺入环状产物中而不会断裂。从不同的角度来看,如果在这种环加成反应中涉及通过化学键裂解的某些片段化,它将改变组装顺序并实现更多的产物多样性。在这里,我们报告通过部分或完全的NO自由基结合苯胺和炔烃的化学选择性亚硝基化。多个C–N键,意外的C–N键和N = O键断裂的形成使该片段性环加成反应成为2,5,2-二氢恶唑,1 H -1,2,3-三唑2-氧化物的有效方法或喹喔啉N-氧化物。在露天,无金属和温和条件下的简便操作使该协议特别实用且有吸引力。还进行了一系列的机理研究和密度泛函理论计算,这有助于解释零碎或完整的NO掺入过程,拓宽了新反应发现的领域。
Selective Synthesis of Fused 1,4- and 1,2-Dihydropyridines by Domino Reactions of Arylamines, Acetylenedicarboxylate, Aldehydes, and Cyclic 1,3-Diketones
作者:Jing Sun、Yan Sun、Hong Gao、Chao-Guo Yan
DOI:10.1002/ejoc.201101198
日期:2011.12
A practical procedure for the preparation of fused 1,4-dihydropyridines was developed through the domino four-component reactions of arylamines, acetylenedicarboxylate, aromatic aldehydes, and cyclic 1,3-diketones in acetic acid. Unusual fused 1,2-dihydropyridines can also be efficiently prepared by controlling the reaction conditions.
Efficient Synthesis of the Functionalized Spiro[indoline‐3,4′‐pyridine] via Four‐component Reaction
作者:Jing Sun、Qun Wu、Lijuan Zhang、Chaoguo Yan
DOI:10.1002/cjoc.201100657
日期:2012.7
An efficient synthetic procedure for the functionalizedspiro[indoline‐3,4′‐pyridine] was developed via the four‐componentreactions of arylamines, acetylenedicarboxylates, isatins and malononitrile with triethylamine as the base catalyst. The advantages of this reaction are using common starting material, mild reaction conditions, broad scope of reactants and operational simplicity.
Synthesis of fused pyrrolo[3,4-d]tetrahydropyrimidine derivatives by proline-catalyzed multicomponent reaction
作者:Zhi-Peng Chen、Hai-Bo Wang、Yu-Qin Wang、Qiu-Hua Zhu、Yang Xie、Shu-Wen Liu
DOI:10.1016/j.tet.2014.04.075
日期:2014.7
Novel proline-catalyzed multicomponent reactions (MCRs) for the synthesis of fused pyrrolo[3,4-d]tetrahydropyrimidines 7 and 9 with different substituted patterns have been developed, which provide rapid access to a library of compounds 7 and 9 in medium to excellent yields, by using N-methyl-α-aryl(alkyl)aminomaleimides, amines, and aldehydes as reactants. The catalyst and the ratio of reactants were
已开发出新型脯氨酸催化的多组分反应(MCR),用于合成具有不同取代模式的稠合吡咯并[3,4- d ]四氢嘧啶7和9,可在中等至极好的条件下快速访问化合物7和9的文库。通过使用N-甲基-α-芳基(烷基)氨基马来酰亚胺,胺和醛作为反应物,可得到苯甲酸酯。发现催化剂和反应物的比例对这些反应有显着影响,并提出了合理的机理。
Copper-Catalyzed Three-Component Cascade Michael Addition/Heck-Type Alkylation/Annulation: Accessing Fully Substituted 1,3-Dihydro-2<i>H</i>-pyrrol-2-ones
We report a highly efficient copper-catalyzed three-component reaction of alkylamines, acetylenedicarboxylates, and alpha-bromocarbonyls for the assembly of fully substituted 1,3-dihydro-2H-pyrrol-2-ones. A variety of alkylamines and ammonium salt are functionalized with acetylenedicarboxylates and alpha-bromocarbonyls. N-aryl enam-inoesters are also successfully alkylated with alpha-bromocarbonyls. This protocol is understood to proceed through radical Heck-type coupling of in-situ-generated bulky trisubstituted alkenes with bulky tertiary alkyl bromides, which is realized for the first time.