Efficient and eco-friendly synthesis of 2-amino-4H-chromene derivatives using catalytic amount of tetrabutylammonium chloride (TBAC) in water and solvent-free conditions
An Eco‐friendly Catalytic System for One‐pot Multicomponent Synthesis of Diverse and Densely Functionalized Pyranopyrazole and Benzochromene Derivatives
作者:U. P. Patil、Rupesh C. Patil、Suresh S. Patil
DOI:10.1002/jhet.3564
日期:2019.7
An external base‐free, efficient, cost‐effective, and environmentally benign protocol has been developed for the one‐pot multicomponentsynthesis of highly functionalized pyranopyrazoles and benzochromenes using water extract of Agave americana (century plant) leaf ash, a waste‐derived catalyst, at roomtemperature. Mild reaction conditions, high yield, easy isolation of products, eco‐friendly standards
Triton B catalyzed three-component, one-pot synthesis of 2-amino-2-chromenes at ambient temperature
作者:Gowravaram Sabitha、M. Bhikshapathi、Sambit Nayak、R. Srinivas、J. S. Yadav
DOI:10.1002/jhet.544
日期:2011.3
2‐amino‐2‐chromenes is described at ambient temperature by the reaction of an aldehyde and malononitrile or ethyl cyanoacetate with α‐naphthol or β‐naphthol in ethanol in presence of a catalytic amount of TritonB. J. Heterocyclic Chem., (2011).
The One-Step Synthesis of 3,4-Dihydropyrano[F]Chromene Derivatives in Under Grinding as an Environmentally Friendly Alternative
作者:Abolghasem Shameli Akandi、Ebrahim Balali、Talieh Mosavat、Mohammad Mehdi Ghanbari、Ali Eazabadi
DOI:10.13005/ojc/300225
日期:2014.7.1
1,4-diazabicyclo[2.2.2]octane (DABCO) was used as a catalyst for one-pot, three-component condensation reactions consisting of aromatic aldehydes, malononitrile and β-Naphtol under grinding at room temperature, to afford the corresponding dihydropyrano[c]chromenes in high yields. This method has the advantages of a simple operation, mild reaction conditions, high yields, by using a less toxic and low cost chemical as a catalyst.
DABCO‐Catalyzed Efficient Synthesis of Naphthopyran Derivatives via One‐Pot Three‐Component Condensation Reaction at Room Temperature
作者:Saeed Balalaie、Sorour Ramezanpour、Morteza Bararjanian、Jürgen H. Gross
DOI:10.1080/00397910701862865
日期:2008.3.1
(DABCO) has been used as a mild and efficient catalyst for synthesis of 2‐amino‐3‐cyano naphthopyran derivatives via a one‐potthree‐componentreaction of aromatic aldehydes, naphthols, and malononitrile at room temperature. The short reaction times, easy workup, good to excellent yields, and mild reaction conditions make this domino Knoevenagel–Michael reaction both practical and attractive.
Ultrasonic accelerated efficient synthesis of aminobenzochromenes using Ag
<sub>2</sub>
Cr
<sub>2</sub>
O
<sub>7</sub>
nanoparticles as a reusable heterogeneous catalyst
Ag2Cr2O7 nanoparticles were found to be an exceedingly effective catalyst for the mild and green synthesis of aminobenzochromenes. The reaction was performed under ultrasonic irradiation as an innocuous tool and in water as a green solvent at roomtemperature. This method encompasses several sustainable and economic benefits.
发现Ag 2 Cr 2 O 7纳米颗粒是用于氨基苯并二氢萘酮的温和绿色合成的极其有效的催化剂。反应在室温下在无害工具的超声辐射下和在作为绿色溶剂的水中进行。这种方法具有多种可持续性和经济效益。