An efficient method for the preparation of 2,2,4-trisubstituted 1,2-dihydroquinolines using catalytic amount Bi(OTf)3 as catalyst
作者:Zeynep Gültekin、Wolfgang Frey
DOI:10.3998/ark.5550190.0013.822
日期:——
Substituted 1,2-dihydroquinolines have been synthesised from substituted anilines and methyl pyruvate usingcatalyticamounts of commercially available Bi(OTf)3 as a catalyst under microwave-assisted conditions. This method is simple, easy to work up, inexpensive, with a broad substrate scope and short reaction times. The reaction provides 1,2-dihydroquinolines (19 examples) in good yields (34-97%
media has emerged as a new facet of green chemistry. In this paper, a sulfone‐containing imidazolium‐based Brønsted acid ionic liquid was prepared and used as a recyclable acid catalyst. The ionic liquid catalyst enables the use of an industrially acceptable and environmentally benign solvent, butyl acetate, as the reaction medium. The ionic liquid/butyl acetate biphasic system was successfully utilized
Green synthesis of TiO
<sub>2</sub>
nanoparticles as an efficient heterogeneous catalyst with high reusability for synthesis of 1,2‐dihydroquinoline derivatives
作者:Mahmoud Abd El Aleem Ali Ali El‐Remaily、Ahmed M. Abu‐Dief、O. Elhady
DOI:10.1002/aoc.5005
日期:2019.8
TiO2 NPs synthesis using agricultural waste at lower applied temperature. Characterization of the extracted TiO2 NPs was confirmed by XRD, SEM, EDAX, TEM, HR‐TEM, SAED, and FT‐IR, respectively. The catalytic activity of TiO2 NPs was investigated in synthesis of 1,2‐dihydroquinoline derivatives with excellent yields and low cost. Purification of the synthesized 1,2‐dihydroquinoline derivatives carried
Brønsted acid (HNO3)-catalyzed tandem reaction of α-ketoesters and arylamines: efficient synthesis of 1,2-dihydroquinoline derivatives
作者:Xiao-Yu Hu、Ji-Chen Zhang、Wei Wei、Jian-Xin Ji
DOI:10.1016/j.tetlet.2011.03.134
日期:2011.6
A simple and convenient Brønsted acid (HNO3)-catalyzed tandemreaction of α-ketoesters with primary or secondary aromatic amines for the synthesis of polysubstituted 1,2-dihydroquinolines has been developed via a tandem process, which has the advantages of ready availability of catalyst, operation simplicity, atom efficiency as well as low toxicity. In particular, tricyclic dihydroquinolines, generally