Iodine-mediated intramolecular amination of ketones: the synthesis of 2-acylindoles and 2-acylindolines by tuning N-protecting groups
作者:Wen-Chao Gao、Shan Jiang、Ruo-Lin Wang、Chi Zhang
DOI:10.1039/c3cc40797g
日期:——
A general method for constructing both 2-acylindoles and 2-acylindolines via I2-mediated intramolecular C-N bond formation is presented, and the selective formation of either 2-acylindoles or 2-acylindolines just depends on the nitrogen protecting groups used in the same substrate skeletons.
A Novel Approach to Highly Substituted β‐Carbolines via Reductive Ring Transformation of 2‐Acyl‐3‐isoxazolylindoles
作者:Alexandra Kamlah、Franz Bracher
DOI:10.1002/ejoc.202000230
日期:2020.5.14
have worked out a new approach to 1,3,4‐trisubstituted β‐carbolines of pharmaceutical interest. As central building blocks we used 2‐acylindoles, which are readily available from indole‐2‐Weinreb amides. Bromination at C‐3, followed by Suzuki–Miyaura cross‐coupling with isoxazole‐4‐boronates gives 2‐acyl‐3‐isoxazolylindoles. Ring closure to the β‐carbolines was accomplished by reductive ring transformation
Formal [4 + 2] benzannulation of 2-alkenyl indoles with aldehydes: a route to structurally diverse carbazoles and bis-carbazoles
作者:Ankush Banerjee、Avishek Guin、Shuvendu Saha、Anushree Mondal、Modhu Sudan Maji
DOI:10.1039/c8ob02875c
日期:——
Construction of structurally diverse carbazoles and bis-carbazoles by protecting-group-free formal [4 + 2]-benzannulation of 2-alkenyl indoles and aldehydes is demonstrated. The sequence of four different reactions is executed in one-pot using readily available and cheap bottle reagents as catalysts rendering this method attractive. The incorporation of inexpensive and environmentally benign molecular
Batting the ylides: A simple procedure carried out under mild conditions allows the direct and efficientsynthesis of structurally diverse indoles. This approach involves a cascadereaction of sulfurylides and N‐(ortho‐chloromethyl)arylamides (see scheme).
A Practical Synthesis of 2-Aroylindoles from N-(2-Formylphenyl)trifluoroacetamides in PEG-400
作者:Jiancun Zhang、Yu Zhao、Deyao Li、Liwen Zhao
DOI:10.1055/s-0030-1258445
日期:2011.3
to the synthesis of highly functionalized 3-unsubstituted 2-aroylindoles is described. Moderate to good yields were obtained through the reaction of easily accessible N-(2-formylphenyl)trifluoroacetamides and α-bromoacetophenones in the presence of K2CO3. PEG-400 was found to be an efficient and reusable solvent in the process. 2-aroylindoles - PEG-400 - N-(2-formylphenyl)trifluoroacetamides - heterocycles
描述了一种一锅法且对环境无害的方法,用于合成高度官能化的3-未取代的2-芳酰基吲哚。在K 2 CO 3存在下,通过容易获得的N-(2-甲酰基苯基)三氟乙酰胺与α-溴乙酰苯的反应,可得到中等至良好的收率。发现PEG-400是该过程中有效且可重复使用的溶剂。 2-芳基吲哚-PEG-400- N-(2-甲酰基苯基)三氟乙酰胺-杂环-环化