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
Libraries of benzoxanthenes, as well as of benzochromenes, were efficiently synthesized via one-pot, three-componentreactions of 2-naphthol, aldehydes, and cyclic 1,3-diketones/malononitrile/ethyl cyanoacetate in the presence of catalytic amount of ceric ammonium nitrate (CAN) under solvent free conditions. The protocol offers rapid synthesis of structurally diverse benzoxanthenes and benzochromenes
Clean, One‐Pot Synthesis of Naphthopyran Derivatives in Aqueous Media
作者:Tong‐Shou Jin、Jian‐She Zhang、Li‐Bin Liu、Ai‐Qing Wang、Tong‐Shuang Li
DOI:10.1080/00397910600632096
日期:2006.6
Abstract A general and practical one‐pot synthesis of naphthopyran derivatives using hexadecyltrimethylammonium bromide (HTMAB) as catalyst (10 mol%) is described. This method provides several advantages such as neutral conditions, high yields and simple workup procedure. The catalyst is low cost, facile, active, environmentally friendly, and reusable. In addition, water is chosen as a green solvent
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