A phosgene and peroxide-free one-pot tandem synthesis of isatoic anhydrides involving anthranilic acid, Boc anhydride, and 2-chloro-N-methyl pyridinium iodide
摘要:
A phosgene and peroxide-free approach for the synthesis of isatoic anhydrides has been described. The synthesis involves the carbamate formation with Boc anhydride followed by in situ cyclization to afford the isatoic anhydride. The importance of this synthetic strategy is in the ease of operation, scalability, and preparation from readily available raw materials. (C) 2013 Elsevier Ltd. All rights reserved.
Transition-Metal-Catalyzed Hydroamination and Carboamination Reactions of Anthranilic Allenamides as a Route to 2-Vinyl- and 2-(α-Styryl)quinazolin-4-one Derivatives
2-Vinyl- and 2-(α-styryl)quinazolin-4-ones have been synthesized by intramolecular gold-catalyzed hydroamination and palladium-catalyzed carboamination of anthranilicallenamides, easily prepared by prototropic isomerization of the corresponding propargylamides. These procedures, which lead to N-Boc-protected quinazolinones, represent a more flexible alternative to the reported palladium-catalyzedamination
Ruthenium-Catalyzed Hydroamination of Aminoallenes: an Approach to Vinyl Substituted Heterocycles
作者:Gianluigi Broggini、Giovanni Poli、Egle M. Beccalli、Filippo Brusa、Silvia Gazzola、Julie Oble
DOI:10.1002/adsc.201400776
日期:2015.3.9
Heterosubstituted aminoallenes underwent smooth ruthenium‐catalyzed intramolecular exo‐hydroamination reactions yielding the corresponding five‐, six‐, or seven‐membered 1,3‐diaza‐ or 1,3‐oxaza‐heterocyclic structures. This procedure is a valuable and less expensive alternative to the already known transition metal‐catalyzed hydroamination reactions of aminoallenes.
Two-step syntheses of fused quinoxaline-benzodiazepines and bis-benzodiazepines
作者:Zhigang Xu、Justin Dietrich、Arthur Y. Shaw、Christopher Hulme
DOI:10.1016/j.tetlet.2010.06.116
日期:2010.8
A two-step solution phase synthesis employing a double UDC (Ugi/Deprotect/Cyclize) strategy has been utilized to obtain fused 6,7,6,6-quinoxalinone-benzodiazepines and 6,7,7,6-bis-benzodiazepines. Optimization of the methodology to produce these tetracyclic scaffolds was enabled by microwave irradiation, incorporation of trifluoroethanol as solvent, and the use of the convertible isocyanide, 4-tert-butyl
Use of Cyclohexylisocyanide and Methyl 2-Isocyanoacetate as Convertible Isocyanides for Microwave-Assisted Fluorous Synthesis of 1,4-Benzodiazepine-2,5-dione Library
作者:Hongyu Zhou、Wei Zhang、Bing Yan
DOI:10.1021/cc900157w
日期:2010.1.11
A new protocol in which cyclohexylisocyanide and methyl 2-isocyanoacetate are used as convertible isocyanides for Ugi/de-Boc/cyclization/Suzuki synthesis of biaryl-substituted 1,4-benzodiazepine-2,5-diones has been developed. Ugireactions of Boc-protected anthranilic acids, fluorous benzaldehydes, amines, and cyclohexylisocyanide or methyl 2-isocyanoacetate were carried out at room temperature. Microwave-promoted
作者:Timothy R. Ward、Brandon J. Turunen、Torsten Haack、Benjamin Neuenswander、William Shadrick、Gunda I. Georg
DOI:10.1016/j.tetlet.2009.09.024
日期:2009.11
A library of 72 quinolones was synthesized from substituted anthranilic acids, using ynone intermediates. These masked beta-dicarbonyl synthons allowed cyclization under milder conditions than previously reported quinolone syntheses. (C) 2009 Elsevier Ltd. All rights reserved