Domino bicyclization of 2,2-dihydroxyindene-1,3-dione with cyclic enaminones leading to isochromeno[4,3-b]indoles
摘要:
New and practical acid-promoted domino bicyclization between 2,2-dihydroxyindene-1,3-dione and cyclic enaminones has been established for the formation of tetracyclic isochromeno[4,3-b]indoles under microwave heating. The present method simultaneously installs C-N, C-O, and C-C bonds, allowing direct assemble of functionalized isochromeno[4,3-b]indole skeleton with a wide diversity in substituents. The reaction features reliable scalability, flexibility of structural modification, and wide substrate scope as well as operational simplicity, and it can avoid time-consuming and costly syntheses, tedious work-up, and isolation of intermediate. (C) 2014 Elsevier Ltd. All rights reserved.
Domino reactions of cyclic enaminones leading to selective synthesis of pentacyclic indoles and its functionalization
作者:Wei Fan、Yan-Rong Li、Qun Li、Bo Jiang、Guigen Li
DOI:10.1016/j.tet.2016.06.058
日期:2016.8
established, providing selective protocol to pentacyclic indoles with different substituted patterns (up to 50 examples). Both substitutions on the cyclic enaminone ring and reaction temperatures showed obvious impact on the reaction pathways. For instance, selective allylic hydroxylation and allylic esterification of in situ generated indoles depend on reaction temperatures. With special substituents
These microwave-assisted transformations in environmentally compatible ethanol resulted in continuous multiple bond-forming events including C–C, C–N, and C–O bonds, enabling catalyst-free multicomponentbicyclizations to rapidly build up functional N,O-heterocycles.
从具有环烯胺酮和氨基酸的简单易得的芳基乙二醛中,已经公开了一种新的,高度环保的方法,该方法具有高收率和高非对映选择性(高达> 99:1),可用于多样化和功能化的恶唑并[5,4- b ]吲哚。这些在环境相容的乙醇中的微波辅助转化导致连续的多个键形成事件,包括C–C,C–N和C–O键,从而使无催化剂的多组分双环化能够快速建立功能性的N,O-杂环。
Highly Selective Domino Multicyclizations for Forming Polycyclic Fused Acridines and Azaheterocyclic Skeletons
作者:Bo Jiang、Xue Wang、Hai-Wei Xu、Man-Su Tu、Shu-Jiang Tu、Guigen Li
DOI:10.1021/ol400322v
日期:2013.4.5
Highly selective four-component domino multicyclizations for the synthesis of new fused acridines and azaheterocyclic skeletons have been established by mixing common reactants in isobutyric acid under microwave irradiation. The reactions proceed at fast rates and were conducted to completion within 20-30 min. Up to seven new chemical bonds, four rings, and four stereocenters were assembled in a convenient one-pot operation. The resulting hexacyclic and pentacyclic fused acridines and their stereochemistry have been fully characterized and determined by X-ray structural analysis.
A new and efficient domino strategy to indole derivatives synthesis and its C3-bisfunctionalization
作者:Li-Yuan Xue、Bo Jiang、Man-Su Tu、Shu-Jiang Tu
DOI:10.1016/j.tetlet.2012.09.120
日期:2012.11
A series of new poly-functionalized indole derivatives were synthesized via domino reactions of alloxan monohydrate and N-aryl substituted enaminones in HOAc at room temperature. The direct C3-bisfunctionalization of indole ring was achieved in a one-pot operation. The reaction is easy to perform simply by mixing common reactants in acetic acid. The reaction proceeds at fast rates and can be finished within 24 min, which makes workup convenient to give good to excellent chemical yields. (C) 2012 Elsevier Ltd. All rights reserved.