碳二亚胺9a在138℃下在γ-萜品烯中的热解产生2-(苯氨基)喹啉(11a,49%)和母体6H-吲哚并[2,3-b]喹啉(14a,16%)。显然,通过双自由基10a生成11a,然后从γ-萜品烯中提取氢原子。通过12a的两步双自由基途径或一个分子内Diels-Alder反应一步可提供13a,然后将其进行互变异构化得到14a。对于在乙炔基末端具有三甲基甲硅烷基取代基的碳二亚胺9b,在138℃下在回流的对二甲苯中热解仅产生6H-吲哚并[2,3-b]喹啉14b(86%)。在回流的乙醇中用6 N NaOH处理14b,然后以92%的收率得到14a。类似地,通过碳二亚胺9c-f的热解获得6H-吲哚并[2,3-b]喹啉14c-f。通过使用4-甲氧基苯基异氰酸酯与亚氨基膦酸酯2d和2f之间的氮杂-维蒂希反应来产生相应的碳二亚胺,然后进行热分解,得到在C上具有甲氧基取代基的6H-吲哚并[2,3-b]喹啉16d和16f。
A Concise Formal Synthesis of Alkaloid Cryptotackiene and Substituted 6<i>H</i>-Indolo[2,3-<i>b</i>]quinolines
作者:G. S. M. Sundaram、C. Venkatesh、U. K. Syam Kumar、H. Ila、H. Junjappa
DOI:10.1021/jo049227t
日期:2004.8.1
A five-step formal synthesis of alkaloid cryptotackiene and its 2-formyl, 11-methyl/phenyl derivatives involving conjugate addition of enolate anion from cyclohexanone (or 4-methylcyclohexanone) to bis[(methylsulfanyl)methylene]-2-oxindole followed by heterocyclization in the presence of ammonium acetate as the key step has been developed. The 11-methylsulfanyl group in the initial precursor can be
An efficient iron-promoted synthesis of 6H-indolo[2,3-b]quinolines and neocryptolepine derivatives
作者:Zicong Yan、Changfeng Wan、Jianyong Wan、Zhiyong Wang
DOI:10.1039/c6ob00469e
日期:——
A facile and practical method for the preparation of 6H-indolo[2,3-b]quinolines and neocryptolepines was developed under the promotion of the easily available ferric trichloride, affording the desired products with moderate to good yields.
在容易获得的三氯化铁的促进下,开发了一种简便实用的制备6 H-吲哚并[2,3- b ]喹啉和新隐油菜碱的方法,从而以中等至良好的收率提供了所需的产物。
Microwave-Assisted Cascade Strategy for the Synthesis of Indolo[2,3-<i>b</i>]quinolines from 2-(Phenylethynyl)anilines and Aryl Isothiocynates
作者:Wajid Ali、Anjali Dahiya、Ramdhari Pandey、Tipu Alam、Bhisma K. Patel
DOI:10.1021/acs.joc.6b02912
日期:2017.2.17
The in situ generated o-alkynylthioureas obtain by reacting 2-(phenylethynyl)anilines and aryl isothiocynates undergo efficient cascade cyclization in the presence of Ag2CO3 to form indoloquinolines under microwave heating. The present tandem process allows the generation of a variety of indolo[2,3-b]quinolinesderivatives in good to moderate yields with a wide functional group tolerance.
通过使2-(苯基乙炔基)苯胺与异硫氰酸芳基酯反应获得的原位生成的邻炔基硫脲在微波加热下在Ag 2 CO 3存在下进行有效的级联环化反应形成吲哚喹啉。本发明的串联方法允许以良好的至中等的产率产生具有宽泛的官能团耐受性的多种吲哚并[2,3- b ]喹啉衍生物。
Domino N<sub>2</sub>-Extrusion–Cyclization of Alkynylarylketone Derivatives for the Synthesis of Indoloquinolines and Carbocycle-Fused Quinolines
New synthetic approaches for the synthesis of indoloquinolines and carbocycle-fused quinolines have been developed employing alkynylketone substrates. These synthetic transformations involved the application of N2-extrusion of azido complexes as a key step to generate carbodiimidium ion and nitriliumion in situ, which further cyclized intramolecularly with alkyne via a domino process to provide indoloquinolines
Efficient two-step synthesis of structurally diverse indolo[2,3-<i>b</i>]quinoline derivatives
作者:Sandip Kundal、Baitan Chakraborty、Kartick Paul、Umasish Jana
DOI:10.1039/c8ob03033b
日期:——
A general and efficient synthesis of diverse tetracyclic indolo[2,3-b]quinoline derivatives was achieved through palladium-catalyzed domino carboannulation/cross-coupling and DDQ-mediated double cross-dehydrogenative C–N bond formation. This approach provides a straightforward, atom-economical and concise route to easily access a diverse range of tetracyclic indolo[2,3-b]quinolines and their analogues
通过钯催化的多米诺碳环化/交叉偶联和DDQ介导的双交叉脱氢C-N键的形成,可以实现多种四环吲哚并[2,3- b ]喹啉衍生物的一般有效合成。该方法提供了一种简单,原子经济且简洁的途径,可以轻松获得具有优良收率且对官能团具有良好耐受性的各种四环吲哚并[2,3- b ]喹啉及其类似物。