Hypervalent iodine(<scp>iii</scp>)-promoted N-incorporation into N-aryl vinylogous carbamates to quinoxaline diesters: access to 1,4,5,8-tetraazaphenanthrene
作者:A. Sagar、Shinde Vidaycharan、Anand H. Shinde、Duddu S. Sharada
DOI:10.1039/c6ob00447d
日期:——
A novel oxidative N-incorporation strategy for synthesis of quinoxaline diesters under metal-free conditions is described for the first time. The mild reaction conditions allow for this transformation via the formation of two C(sp2)–N bonds utilizing cheaply available NaN3 as the N-atom source. N-Aryl vinylogous carbamates in this study undergo azidation at enamino C(sp2)–H selectively. The robustness
Application and developing of iron‐doped multi‐walled carbon nanotubes (Fe/MWCNTs) as an efficient and reusable heterogeneous nanocatalyst in the synthesis of heterocyclic compounds
Iron‐dopedmulti‐walledcarbonnanotubes (Fe/MWCNTs) is an efficient, ecofriendly and reusableheterogeneousnanocatalyst for the one‐pot synthesis of heterocycliccompounds including bis‐spiro piperidines, piperidines, dihydro‐2‐oxopyrroles, pyrazoles and diazepines at room temperature with good to excellent yields. The heterogeneousnanocatalyst was fully characterized by scanning electron microscopy
铁掺杂的多壁碳纳米管(Fe / MWCNTs)是一种高效,生态友好且可重复使用的多相纳米催化剂,用于在室温下单锅合成杂环化合物,包括双螺哌啶,哌啶,二氢-2-氧吡咯,吡唑和二氮杂s温度高到极好的产量。通过扫描电子显微镜(SEM),X射线衍射(XRD),电感耦合等离子体(ICP)和FT-IR分析充分表征了多相纳米催化剂。同样,所有制备的化合物的结构均通过1 H NMR表征,13C NMR,FT-IR,质谱(MS)和元素分析。这些规程的主要优点是温和且绿色的反应条件,较短的反应时间,清洁的反应,操作简单,易于纯化以及可重复使用的多相纳米催化剂的产率高至优异。将该催化剂循环十次而活性没有明显损失。
TRIFLUOROACETIC ACID CATALYZED ONE-POT FOUR-COMPONENT DOMINO REACTION FOR THE SYNTHESIS OF SUBSTITUTED DIHYDRO 2-OXYPYRROLES
Trifluoroaceticacid was applied as an efficient catalyst for the one-pot four-component synthesis of N-aryl/alkyl-3-aminodihydropyrrol-2-one-4-carboxylates via the domino reaction of amines, formaldehyde and dialkyl acetylenedicarboxylates at ambient temperature in methanol. This methodology includes number of advantages such as: short reaction time, clean work-up, use of inexpensive catalyst, high
l-Proline-catalyzed synthesis of highly functionalized multisubstituted 1,4-dihydropyridines
作者:Huanfeng Jiang、Ronghuan Mai、Hua Cao、Qiuhua Zhu、Xiaohang Liu
DOI:10.1039/b914659h
日期:——
Highlyfunctionalized multisubstituted 1,4-dihydropyridines 5 have been concisely synthesized in moderate to good yields viaL-proline-catalyzed one-pot multicomponentreactions (MCRs) of alkynoates or alkynones 1, amines 2, β-dicarbonyl compounds 3 and aldehydes 4 under mild conditions. The MCR process involves hydroamination/Knoevenagel condensation/Michael-type addition/intramolecular cyclization
Hydroamination Reactions of Alkynes with<i>ortho</i>-Substituted Anilines in Ball Mills: Synthesis of Benzannulated N-Heterocycles by a Cascade Reaction
electrophilic alkynes and anilines with OH, NH, or SH groups in the ortho position. For the heterocycle formation, it was shown that several stress conditions were able to initiate the reaction in the solid state. Processing in a ball mill seemed to be advantageous over comminution with mortar and pestle with respect to process control. In the latter case, significant postreaction modification occurred during