Iodine-catalyzed aromatization of tetrahydrocarbazoles and its utility in the synthesis of glycozoline and murrayafoline A: a combined experimental and computational investigation
A Tandem Reduction-Oxidation Protocol for the Conversion of 1-Keto-1,2,3,4-tetrahydrocarbazoles to Carbazoles via Tosylhydrazones through Microwave Assistance: Efficient Synthesis of Glycozoline, Clausenalene, Glycozolicine, and Deoxycarbazomycin B and th
作者:Suchandra Chakraborty、Gautam Chattopadhyay、Chandan Saha
DOI:10.1002/jhet.999
日期:2013.1
methodology for the synthesis of carbazoles from 1‐keto‐1,2,3,4‐tetrahydrocarbazoles via the corresponding tosylsulfonhydrazones by a one‐pot tandem reduction–oxidation protocol using a combination of NaBH4 and Pd–C on MgSO4·7H2O, a solidsupport, under microwave is developed. The reaction is successfully extended toward the synthesis of several naturally occurring carbazole alkaloids, namely 3‐methylcarbazole
Convenient and Efficient Synthesis of 1-Oxo-1,2,3,4-tetrahydrocarbazoles via Fischer Indole Synthesis
作者:Rong Sheng、Li Shen、You-Qin Chen、Yong-Zhou Hu
DOI:10.1080/00397910802499567
日期:2009.2.25
Abstract A convenient synthesis of 1-oxo-1,2,3,4-tetra-hydrocarbazoles has been developed by reaction of 2-aminocyclohexanone hydrochlorides with various phenylhydrazine hydrochlorides viaFischerindolesynthesis under mild conditions. The method is more satisfactory in terms of the easy availability of starting materials and the simple one-pot operation.
A novel CAN-SiO2-mediated one-pot oxidation of 1-keto-1,2,3,4-tetrahydrocarbazoles to carbazoloquinones: Efficient syntheses of murrayaquinone A and koeniginequinone A
作者:Suchandra Chakraborty、Gautam Chattopadhyay、Chandan Saha
DOI:10.1002/jhet.561
日期:2011.3
1‐keto‐1,2,3,4‐tetrahydrocarbazoles (1) to carbazole‐1,4‐quinones (2) are efficiently carried out by CAN‐SiO2‐mediated reaction. This generalized protocol was successfully extended to the synthesis of two naturally occurring carbazoloquinones: murrayaquinone A (2b) and koeniginequinone A (2g). A plausible mechanism for this novel reaction involves formation of a 9‐hydroxy‐2,3,4,9‐tetrahydro‐1H‐carbazole‐1‐one
Nickel(II)-Catalyzed [5 + 1] Annulation of 2-Carbonyl-1-propargylindoles with Hydroxylamine To Synthesize Pyrazino[1,2-<i>a</i>]indole-2-oxides in Water
作者:Hong-Yan Bi、Min Du、Cheng-Xue Pan、Yuhong Xiao、Gui-Fa Su、Dong-Liang Mo
DOI:10.1021/acs.joc.9b00784
日期:2019.8.16
the efficient synthesis of various pyrazino[1,2-a]indole-2-oxides was developed through a nickel(II)-catalyzed [5 + 1] annulation of 2-carbonyl-1-propargylindoles with hydroxylamine in water without using an organic solvent. The reaction involved an initial condensation of 2-carbonyl-1-propargylindoles with hydroxylamine to afford oxime intermediates, which then underwent a nickel(II)-catalyzed 6-exo-dig
通过镍(II)催化的2-羰基-1-炔丙基吲哚的[5 +1]环化反应,开发了一种原子经济实用的方法,可有效合成各种吡嗪并[1,2 - a ]吲哚-2-氧化物。在不使用有机溶剂的情况下与羟胺一起使用。该反应涉及2-羰基-1-炔丙基吲哚与羟胺的初始缩合以提供肟中间体,然后将其进行镍(II)催化的6-exo-dig环化。初步研究表明(n -Bu)4NI用作相转移催化剂,并促进了活性镍(II)物种的形成。更重要的是,镍(II)盐和水中的相转移催化剂可以循环使用七次,并且通过过滤和洗涤方案可以容易地以高收率获得克级可缩放产品。
Direct oxidation of bromo-derived Fischer–Borsche oxo-ring using molecular iodine with combined experimental and computational study
作者:Vivek T. Humne、Monica H. Ghom、Mahavir S. Naykode、Yuvraj Dangat、Kumar Vanka、Pradeep Lokhande
DOI:10.1039/d2ob00793b
日期:——
direct oxidation of the bromo-derived Fischer–Borsche oxo-ring leading to carbazolequinone has been developed by usingmoleculariodine. This unprecedented transformation has been used for the modular synthesis of the anti-cardiotonic agent murrayaquinone. Furthermore, the present method has been generalized to a broad range of functional groups, with good to excellent yield.