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.
base-Co(AcO)2, reveals high catalytic performance within the synthesis of pyran derivatives using the multicomponent reaction of aldehydes, malononitrile and 2-naphthol (or cyclohexane-1,3-dione) in water. The reactions afforded the desired products in high yields (up to 97% and 95%). The substantial feature is that the mesoporous-complex catalyst could be easily separated from the reaction mixture by centrifugation
A simple green protocol for the synthesis of ethyl 3-amino-1-aryl-1<i>H</i>-benzo[<i>f</i>] chromene-2-carboxylates in aqueous media
作者:Siran Qian、Mingjie Li、Jiaming Liu、Cunde Wang
DOI:10.3184/174751917x15016663252830
日期:2017.8
efficient straightforward method has been developed for the synthesis of ethyl 3-amino-1-aryl-1H-benzo[f]chromene-2-carboxylate derivatives via 1,4-diazabicyclo[2.2.2]octane (DABCO)-catalysed cyclisation of β-naphthol and 3-aryl-2-cyanoacrylates using water as a green solvent. All products precipitated from the reaction mixture and were isolated by simple filtration. No further work-up nor purification was