Synthesis of 2-amino-4-aryl-7,7-dimethyl-5-oxo-4<i>H</i>-5,6,7,8-tetrahydrobenzo[<i>b</i>]pyran derivatives in ionic liquid medium
作者:Yuling Li、Baixiang Du、Xiangshan Wang、Daqing Shi、Shujiang Tu
DOI:10.1002/jhet.5570430323
日期:2006.5
In this paper, preparation of 2-Amino-4-aryl-7,7-dimethyl-5-oxo-4H-5,6,7,8-tetrahydrobenzo[b]pyranderivatives from aromatic aldehyde, malononitrile or cyanoacetate and 5,5-dimethyl-1,3-cyclohexanedione in ionicliquid [bmim+][BF4−] was described. Compared with other methods, this new method has the advantages of easier work-up, milder reaction conditions, high yields and environmentally benign procedure
本文从芳族醛,丙二腈或氰基乙酸酯和5制备2-氨基-4-芳基-7,7-二甲基-5-氧代-4 H -5,6,7,8-四氢苯并[ b ]吡喃衍生物,5-二甲基-1,3-环己二酮在离子液体[BMIM + ] [BF 4 - ]的说明。与其他方法相比,该新方法具有易于处理,反应条件温和,收率高和对环境有益的优点。
Zn(L-proline)<sub>2</sub>as an efficient and reusable catalyst for the multi-component synthesis of pyran-annulated heterocyclic compounds
作者:Daryoush Tahmassebi、John E. Blevins、Shori S. Gerardot
DOI:10.1002/aoc.4807
日期:2019.4
multi‐component one‐pot synthesis of 2‐amino‐3‐cyano‐4H‐pyrans and pyran‐annulatedheterocyclic compounds. Zn(L‐proline)2 has been utilized as a mild and efficient Lewis acid catalyst for the three‐component reaction of aromatic aldehydes, malononitrile and enolizable C‐H acids or activated phenols to synthesize pyran‐annulated scaffolds. 3‐Methyl‐1‐phenyl‐2‐pyrazolin‐5‐one, 4‐hydroxycoumarine, dimedone
β-Cyclodextrin as an efficient catalyst for the one-pot synthesis of tetrahydrobenzo[b]pyran derivatives in water
作者:Jun Lu、Xue-wen Fu、Ge Zhang、Chun Wang
DOI:10.1007/s11164-015-2027-0
日期:2016.2
Various 4H-benzo[b]pyran derivatives were synthesized via a one-pot three-component condensation of arylaldehyde, malononitrile and dimedone in water using β-cyclodextrin (β-CD) as an efficient catalyst. This method provides several advantages, including mild reaction conditions, operational simplicity, high yields and minimal pollution of the environment.
A new PEG-1000-based dicationic ionic liquid exhibiting temperature-dependent phase behavior with toluene and its application in one-pot synthesis of benzopyrans
作者:Huizhen Zhi、Chunxu Lü、Qiang Zhang、Jun Luo
DOI:10.1039/b822481a
日期:——
A new recyclable temperature-dependant phase-separation system comprised of PEG-1000-based dicationic acidic ionic liquid and toluene was developed and used in one-pot three-component condensation to prepare benzopyrans in excellent yields (up to 93%).