An efficient four-component domino protocol for the rapid and green synthesis of functionalized benzo[a]pyrano[2,3-c]phenazine derivatives using caffeine as a homogeneous catalyst
A one-pot, two-step procedure has been used to synthesize functionalized benzo[a]pyrano[2,3-c]phenazine derivatives from a four-component condensation reaction of 2-hydroxynaphthalene-1,4-dione, o-phenylenediamine, aldehydes, and malononitrile in the presence of 1,3,7-trimethylpurine-2,6-dione (caffeine) as an expedient and reusable solid base catalyst. This new procedure has the following advantages: operational simplicity, short reaction times, environmentally friendly, easy work-up, and all the products were obtained in excellent yields.
Multicomponent Synthesis of Poly-Substituted Benzo[<i>a</i>]pyrano[2,3-<i>c</i>]phenazine Derivatives under Microwave Heating
作者:Shu-Liang Wang、Fei-Yue Wu、Chuang Cheng、Ge Zhang、Yin-Ping Liu、Bo Jiang、Feng Shi、Shu-Jiang Tu
DOI:10.1021/co1000376
日期:2011.3.14
one-pot two-step tandem synthesis of highly functionalized benzo[a]pyrano[2,3-c]phenazine derivatives via microwave-assisted multicomponent reactions of 2-hydroxynaphthalene-1,4-dione, diamines, aldehydes, and malononitrile is reported. The procedures are facile, avoiding time-consuming and costly syntheses, tedious workup, and purifications of precursors, as well as protection/deprotection of functional
Theophylline as a new and green catalyst for the one-pot synthesis of spiro[benzo[ a ]pyrano[2,3- c ]phenazine] and benzo[ a ]pyrano[2,3- c ]phenazine derivatives under solvent-free conditions
A green, convenient, high yielding and one-pot procedure for the synthesis of novel spiro[benzo[a]pyrano[2,3-c]phenazine] derivatives by domino multi-component condensation reaction between 2-hydroxynaphthalene-1,4-dione, benzene-1,2-diamines, ninhydrine, and malononitrile in the presence of a catalytic amount of 1,3-dimethyl-7H-purine-2,6-dione (theophylline) as an expedient, eco-friendly and reusable
Mild basic ionic liquid catalyzed four component synthesis of functionalized benzo[a]pyrano[2,3-c]phenazine derivatives
作者:Hamid Reza Shaterian、Majid Mohammadnia
DOI:10.1016/j.molliq.2012.11.006
日期:2013.1
An efficient, mild, and one-pot quantitative procedure for the preparation of functionalized benzo[a]pyrano[2,3-c] phenazine derivatives from four component reaction of 2-hydroxynaphthalene-1,4-dione, o-phenylenediamine, aldehydes, and malononitrile in the presence of basic ionic liquids such as 1-butyl-3-methylimidazolium hydroxide, 3-hydroxypropanaminium acetate, pyrrolidinium formate, pyrrolidinium acetate, 1,8-diazabicyclo[5.4.0]-undec-7-en-8-ium acetate, and piperidinium formate as the catalysts has been developed. The ionic liquid was stable during the reaction process and could also be reused several times with consistent activity. This procedure may be a practical alternative to the existing one reported procedure to meet the need of academe as well as industries. (C) 2012 Elsevier B.V. All rights reserved.