Catalyst-free 1,3-dipolar cycloaddition of 3-nitrochromen with sodium azide: a facile method for the synthesis of 4-aryl-1,4-dihydrochromeno[4,3-d][1,2,3]triazole derivatives
摘要:
1,3-Dipolar cycloaddition of 3-nitrochromen with sodium azide under catalyst-free conditions afforded 4-aryl-1,4-dihydrochromeno[4,3-d][1,2,3]triazole derivatives at 80 degrees C in DMSO is described. The generality of this reaction was demonstrated by synthesizing an array of 4-aryl-1,4-dihydrochromeno[4,3d][1,2,3]triazole derivatives. Clean reaction conditions, easy isolation, and good yields of the triazoles are the salient features of the methodology. (C) 2009 Elsevier Ltd. All rights reserved.
Molecular diversity of the domino annulation reaction of 2-aryl-3-nitrochromenes with pivaloylacetonitriles
作者:Wang Jiang、Jing Sun、Ru-Zhang Liu、Chao-Guo Yan
DOI:10.1039/c8ob01504j
日期:——
In the presence of triethylamine, the domino annulation reaction of two molecules of pivaloylacetonitrile with one molecule of 2-aryl-3-nitrochromene in tetrahydrofuran resulted in the unprecedented imino-substituted dihydrofuro[2,3-c]chromene derivatives in high yields.
“On-Water”-Promoted<i>C</i>-Alkylation of Indoles with 2-Aryl-3-nitro-2<i>H</i>-chromenes under Catalyst-Free Conditions
作者:Pateliya Mujjamil Habib、Veerababurao Kavala、B. Rama Raju、Chun-Wei Kuo、Wen-Chang Huang、Ching-Fa Yao
DOI:10.1002/ejoc.200900207
日期:2009.9
An environmentally benign method for the synthesis of indolyl(nitro)chromans from indoles and 2-aryl-3-nitro-2Hchromenes undercatalyst-freeconditions by use of an “onwater” concept is described. The salient features of the methodology are its clean reaction conditions, the eco-friendly
Microwave‐assisted rapid and efficient synthesis of chromene‐fused pyrrole derivatives through multicomponent reaction and evaluation of antibacterial activity with molecular docking investigation
current study aimed to identify a new strategy of FeCl3 catalyzed multicomponent synthesis of substituted2H‐chromene–fused pyrrole derivatives. A series of chromene‐based pyrrole prepared by employing an array of 3‐nitro‐2H‐chromenes, aniline, and acetylacetone in toluene under microwave irradiation. Using FeCl3 as a prompt catalyst and microwave irradiation to synthesize 2H‐chromene–fused pyrrole motifs
Abstract An expedient one-pot sequential three-component synthesis of a series of diverse spiroindenoquinoxaline pyrrolidine fused nitrochromene derivatives following 1,3-dipolarcycloaddition of azomethine ylides generated in situ by the condensation of indenoquinoxalone and α-amino acids (L-proline and L-phenyl alanine) with 3-nitrochromenes as dipolarophile under classical as well as microwave irradiation
摘要 通过茚并喹喔啉和 α-氨基酸(L-脯氨酸和 L -苯基丙氨酸)与 3-硝基色烯作为偶极剂在经典和微波辐射下进行了描述。该协议提供了温和的反应条件、产品的高产率、高区域选择性和操作简单性,可在单次操作中组装复杂的结构实体,并具有良好的收率。环加成反应的区域和立体化学结果通过光谱和单晶 X 射线分析确定。图形概要
One-pot Michael addition–oxidation reaction for the synthesis of coumarin–chromene hybrid compounds from 4-hydroxycoumarin and 3-nitro-2-phenyl-2H-chromene
An efficient and mild method for coumarin–chromene hybrid compounds involving Michael addition of 4-hydroxycoumarin with 3-nitro-2-phenyl-2H-chromene followed by aerial oxidation has been developed. Out of several bases screened for the above reaction, a few furnished the desired compounds in moderate-to good yields. Several hybrids of 4-hydroxycoumarin and 3-nitro-2-phenyl-2H-chromene were obtained following an easy-to-handle non-aqueous work-up procedure without chromatographic separation.