Catalyst-free diastereoselective synthesis of 2-methyl-4-amino-1,2,3,4-tetrahydro-quinoline derivatives in water
摘要:
A diastereoselective synthesis of 2-methyl-4-amino-1,2,3,4-tetrahydro-quinoline derivatives was achieved through the reaction of aromatic amines and tert-enamides in water under reflux conditions. The desired products could be obtained in moderate to excellent yields utilizing water as solvent without any catalyst or additive. (C) 2013 Published by Elsevier Ltd.
Recyclable NaHSO4 catalyzed alkylation of tert-enamides with indoles or amines in water: facile construction of pharmaceutically analogous bis-alkaloid scaffolds
作者:Xue-Qiang Chu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1039/c3ra40833g
日期:——
An efficient sodium hydrogen sulfate catalyzed alkylation of indoles or amines with tertiary enamides has been accomplished in water, affording the pharmacologically and biologically active 2-oxo-1-pyrrolidine derivatives in moderate to excellent yields. The key to our success is the use of NaHSO4 as a low loading, inexpensive, green and recyclable catalyst and the reactions could be scaled up to gram level.
ABSTRACT Reaction of aromatic amines with tertiary enamides was performed in n-hexane in the presence of acetic acid as an inexpensive and green catalyst at roomtemperature. This protocol provides the protected aminals through Markovnikov addition reaction with high to excellent yields and regiospecificity. In addition, this procedure was expanded for the synthesis of aminals from commercially available
Direct alkylation of indoles and amines by tert-enamides: facile access to pharmaceutically active 2-oxo-1-pyrrolidine analogues
作者:Ran Jiang、Hai-Yan Xu、Xiao-Ping Xu、Xue-Qiang Chu、Shun-Jun Ji
DOI:10.1039/c1ob05546a
日期:——
Direct alkylation of indoles and amines by tertiary enamides for the synthesis of pharmaceutically active 2-oxo-1-pyrrolidine analogues was described. With only a 0.5 mol% catalyst loading, molecular iodine was demonstrated to be efficiently enough to promote the reaction under neat condition. Only Markovnikov addition product was obtained indicating that the reactions proceeded with excellent regioselectivity.
A green approach for the one-pot multi-component synthesis of N-substituted γ, δ and ε-lactams involving C–N bond formation catalyzed by FeCl3
作者:Venkatesan Sathesh、Munusamy Sathishkumar、Gunasekar Ramachandran、Ravindranath S. Rathore、Kulathu Iyer Sathiyanarayanan
DOI:10.1039/c3ra44472d
日期:——
A green trend and efficient method for the synthesis of N-substituted γ, δ and ε-lactam derivatives has been developed through one pot multi-component reaction under environmentally benign reaction conditions using FeCl3 as a green catalyst with high atom economy. The present green synthetic protocol shows fascinating properties such as enhanced yield in solvent-free conditions, with high reaction rate, easy workup and absence of column chromatography and also avoids the use of ligands or additives. The versatility of the reaction has been ascertained by using various substituted benzaldehydes, anilines and homologues of lactams.
Cation Radical Aza-Diels-Alder Reaction between <i>N</i>-Arylimines and <i>N</i>-Vinyllactams: A Facile Synthesis of 4-Lactam-<i>N</i>-yl Tetrahydroquinolines
作者:Xiaodong Jia、Li Yang、Bing Han、Wei Zhang、Xiaoling Jin、Zhong-Li Liu
DOI:10.1055/s-2006-942521
日期:2006.9
Cycloaddition of N-arylimines with N-vinylpyrrolidin-2-one or N-vinylazepan-2-one was efficiently induced by tris(4-bromophenyl)aminium hexachloroantimonate producing stereoselectively the corresponding cis-2-aryl-4-(2-oxopyrrolidin-1-yl)- or cis-2-aryl-4-(2-oxoazepan-l-yl)tetrahydroquinoline derivative in good yields.