New approach to synthesis of 4-arylcoumarin derivatives
摘要:
A simple and highly efficient new approach for the synthesis of 4-aryl-2-oxo-2H-chromene-3-carbonitriles based on the oxidation and hydrolysis of 2-amino-4-aryl-4H-chromene-3-carbonitriles is described. (C) 2015 Elsevier Ltd. All rights reserved.
Synthesis and structure of some substituted 2-amino-4-aryl-7-propargyloxy-4<i>H</i>-chromene-3-carbonitriles
作者:Nguyen Dinh Thanh、Do Son Hai、Vu Thi Ngoc Bich、Pham Thi Thu Hien、Nguyen Thi Ky Duyen、Nguyen Thi Mai、Tran Thi Dung、Hoàng Thi Kim Van、Vu Ngoc Toan、Nguyen Hung Huy、Tran Thi Thanh Van、Duong Ngoc Toan、Le Hai Dang
DOI:10.1080/00397911.2018.1543779
日期:2019.1.2
process: the procedure that used potassium carbonate in dried acetone and the procedure that used sodium hydride in dried DMF. The latter gave the ethers 5a-l in higher yields. The single-crystal X-ray structure of propargyl ether 5g has been recorded. Graphical Abstract
Efficient click chemistry towards novel 1H-1,2,3-triazole-tethered 4H-chromene−d-glucose conjugates: Design, synthesis and evaluation of in vitro antibacterial, MRSA and antifungal activities
作者:Nguyen Dinh Thanh、Do Son Hai、Vu Thi Ngoc Bich、Pham Thi Thu Hien、Nguyen Thi Ky Duyen、Nguyen Thi Mai、Tran Thi Dung、Vu Ngoc Toan、Hoàng Thi Kim Van、Le Hai Dang、Duong Ngoc Toan、Tran Thi Thanh Van
DOI:10.1016/j.ejmech.2019.01.060
日期:2019.4
propargyl ethers 5a-t and tetra-O-acetyl-β-d-glucopyranosyl azide. [email protected] was the optimal catalyst for this chemistry. The yields of 1H-1,2,3-triazoles were 80–97.8%. All triazoles 7a-t were evaluated in vitro for anti-microorganism activities. Among tested compounds with MIC values of 1.56–6.25 μM, there were four compounds against B. subtilis, four compounds against S. aureus, and four compounds
该系列的2-氨基-7-炔丙氧基-4- ħ色烯-3-腈5A-T是从相应的2-氨基-7- phydroxy-4中合成ħ色烯-3-腈图4a-T和炔丙基溴。在这些合成中使用了两种方法:K 2 CO 3 /丙酮和NaH / DMF方法,产率分别为65-89%和80-96%。1个ħ -1,2,3-三唑系留4H-苯并吡喃d葡萄糖偶联物7A-T使用炔丙基的点击化学醚合成5A-T和四- ö乙酰基β- d-吡喃葡萄糖基叠氮化物。[电子邮件保护]是该化学反应的最佳催化剂。1 H -1,2,3-三唑的产率为80–97.8%。在体外评估所有三唑7a-t的抗微生物活性。在MIC值为1.56-6.25μM的测试化合物中,有四种化合物对抗枯草芽孢杆菌,四种化合物对抗金黄色葡萄球菌,四种化合物对抗表皮葡萄球菌;有5种抗大肠杆菌的化合物,4种抗肺炎克雷伯菌的化合物,5种抗铜绿假单胞菌的化合物,和6种抗鼠伤寒沙门氏菌的化合物。
Novel ferrocene substituted benzimidazolium based ionic liquid immobilized on magnetite as an efficient nano-catalyst for the synthesis of pyran derivatives
variety of pyran derivatives under ultrasonic irradiation. New five component reactions were designed for the synthesis of novel asymmetric bis-pyran derivatives in the presence of catalytic amount of Fe3O4@SiO2@BenzIm-Fc[Cl]/NiCl2 nanoparticle under ultrasonic. The new catalytic method exhibits some notable advantages such as short reaction times, operational simplicity, green reaction conditions, high
Nano polypropylenimine dendrimer (DAB-PPI-G<sub>1</sub>): as a novel nano basic-polymer catalyst for one-pot synthesis of 2-amino-2-chromene derivatives
作者:Behrooz Maleki、Safoora Sheikh
DOI:10.1039/c5ra04458h
日期:——
For the first time, a novel nano basic-polymer catalyst for the green synthesis of new 2-amino-2-chromene derivatives, avoiding the use of any metal or acid catalysts, is proposed.
Prolinamide functionalized polyacrylonitrile fiber with tunable linker length and surface microenvironment as efficient catalyst for Knoevenagel condensation and related multicomponent tandem reactions
attaching amines to fiber matrix as well as the constructed hydrophobic microenvironment by linker group within the surface layers of fiber materials effectively promotes the reactions. In addition, the good swollen capacity of fiber in solvent ensure that the reaction proceed well. Fiber catalyst PANPA−2F modified by prolinamide with a C2 alkyl chain exhibited the best catalytic performance and can