Antimony Trichloride: An Efficient and Mild Catalyst for Cyclization of 2-Aminochalcones to the Corresponding 2-Aryl-2,3-Dihydroquinolin-4(1H)-ones
摘要:
Antimony trichloride is an efficient catalyst for the cyclization of 2-amino chalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones under mild reaction conditions and in almost quantitative yields.
A Convenient Formal [4+2] Heterocylization Route to Bis(triflyl)tetrahydroquinolines
作者:Carlos Lázaro‐Milla、Pedro Almendros
DOI:10.1002/chem.202102254
日期:2021.9.24
We report the sustainable and efficient synthesis of a new type of quinoline derivatives bearing one or two SO2CF3 groups. The protocol is metal-, catalyst- and irradiation-free, involves the use of readily available and stable precursors, and avoids the formation of side products. Also, the mild conditions of the process allow the tolerance of a wide range of functional groups.
Chiral Phosphoric Acid Catalyzed Asymmetric Synthesis of 2-Substituted 2,3-Dihydro-4-quinolones by a Protecting-Group-Free Approach
作者:Kodai Saito、Yuka Moriya、Takahiko Akiyama
DOI:10.1021/acs.orglett.5b01654
日期:2015.7.2
Chiral 2-substituted 2,3-dihydro-4-quinolones were synthesized based on the chiral phosphoric acid catalyzed intramolecular aza-Michael addition reaction using N-unprotected 2-aminophenyl vinyl ketones as substrates in good yields with high enantioselectivities.
A copper-catalyzed [4+1] cycloannulation of 2-aminochalcones with ethyl 2-diazo-2-phenylacetates, along with migration of the ester group, has been developed in this study, providing a simple and effective method for the synthesis of various indole heterocyclic compounds. This strategy displayed a wide range of substrates and good tolerance of functional groups. Mechanistic studies show that the reaction
Metal organic frameworks (MOFs) are one of the solid porous materials, frequently used as heterogeneous catalysts for organic transformations. In this aspect, we report here the catalytic performance of Cu3(BTC)2 (BTC: 1,3,5-benzenetricarboxylate) as a solid porous material for the synthesis of 4-styrylquinazolines from the sequential reactions between 2-aminochalcone and alcohols in good yields in
金属有机骨架(MOFs)是一种固体多孔材料,经常用作有机转化的非均相催化剂。在这方面,我们在此报告了 Cu 3 (BTC) 2 (BTC: 1,3,5-苯三羧酸盐) 作为固体多孔材料的催化性能,用于从 2-氨基查耳酮和醇之间的连续反应合成 4-苯乙烯基喹唑啉反应时间短,产率高。在针对这种转化测试的 MOF 中,Cu 3 (BTC) 2在 60 °C 下 10 分钟后,2-氨基查耳酮和乙醇的 2-甲基-4-苯乙烯基喹唑啉产率为 86%。在这些条件下,Cu 3 (BTC) 2对合成一系列 4-苯乙烯基喹唑啉衍生物具有广泛的底物范围。还通过进行可重复使用性实验来确定催化剂稳定性,并且活性保持至少四个循环。此外,通过粉末 XRD、FT-IR、UV-Vis 和 SEM 方法观察到新鲜和四次使用的固体之间的显着变化。此外,还将优化的反应条件扩展到从2-氨基苯乙酮、2-氨基二苯甲酮和醇类中获得喹唑啉衍生物。
Copper(II)-Catalyzed Synthesis of Pyrrolo[3,4-<i>b</i>]quinolinediones from <i>o</i>-Amino Carbonyl Compounds and Maleimides
作者:Dhananjay S. Nipate、Krishnan Rangan、Anil Kumar
DOI:10.1021/acs.orglett.3c00240
日期:2023.3.3
A copper(II)-catalyzed cascade synthesis of 1H-pyrrolo[3,4-b]quinoline-1,3(2H)-diones has been achieved from readily available o-amino carbonyl compounds and maleimides. This one-potcascade strategy involves a copper-catalyzed aza-Michael addition followed by condensation and oxidation to deliver the target molecules. The protocol features a broad substrate scope and excellent functional group tolerance
铜 (II) 催化的 1 H-吡咯并 [3,4- b ] 喹啉-1,3(2 H )-二酮的级联合成已经从容易获得的邻氨基羰基化合物和马来酰亚胺中实现。这种单锅级联策略涉及铜催化的氮杂-迈克尔加成,然后进行缩合和氧化以传递目标分子。该协议具有广泛的底物范围和出色的官能团耐受性,并提供中等至良好 (44–88%) 产量的产品。