The reaction of imines with alkynes and alkenes, in the presence of 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), to give quinoline derivatives is described. The mechanism of the annulation is discussed, and evidence supporting a non-concerted pathway, at least when the alkene is butyl vinyl ether, is reported. Preliminary information is also given about solid adducts of imines with DDQ, which do
Efficient synthesis of 2,4-disubstituted quinolines: calix[n]arene-catalyzed Povarov-hydrogen-transfer reaction cascade
作者:Juliana Baptista Simões、Ângelo de Fátima、Adão Aparecido Sabino、Luiz Claudio Almeida Barbosa、Sergio Antonio Fernandes
DOI:10.1039/c4ra02036g
日期:——
A new calixarene-catalyzed cascade process, involving Povarov reaction and hydrogen transfer, for the synthesis of 2,4-disubstituted quinolines is described.
描述了一种新的杯芳烃催化级联过程,涉及Povarov反应和氢转移,用于合成2,4-二取代喹啉。
Annulation reactions with iron(III) chloride: oxidation of imines
Aromatic imines react with phenylacetylene or styrene in an acetonitrile solution of iron(III) chloride to give quinolines 3 or their tetrahydro derivatives 11 together with variable amounts of products 4 arising from the reduction of the imines. The initial step appears to be a one-electron oxidation to generate iron(II) and an imine radical cation. When the reactions are carried out in the presence of stoichiometric amounts of tetrachloro-p-benzoquinone (chloranil), only quinolines 3 are obtained.
Rare-Earth Metal Chlorides Catalyzed One-pot Syntheses of Quinolines under Solvent-free Microwave Irradiation Conditions
作者:Lijun Zhang、Bing Wu、Yongqing Zhou、Jing Xia、Shuangliu Zhou、Shaowu Wang
DOI:10.1002/cjoc.201300047
日期:2013.4
Undermicrowaveirradiation and solvent‐freeconditions, rare‐earth metal chlorides (RECl3) have been efficient catalysts for one‐pot synthesis of quinoline derivatives to give products in good to excellent yields through the multi‐component reactions of aldehydes, amines, and alkynes. The rare‐earth metal chlorides can be recycled for six times without notable loss of catalytic activities. This new