Ruthenium-catalysed oxidative cyclisation of 2-aminobenzyl alcohol with ketones: modified Friedlaender quinoline synthesis
作者:Chan Sik Cho、Bok Tae Kim、Tae-Jeong Kim、Sang Chul Shim
DOI:10.1039/b109245f
日期:2001.12.19
2-Aminobenzyl alcohol is oxidatively cyclised with an array of ketones in dioxane at 80 °C in the presence of a catalytic amount of a ruthenium catalyst and KOH to afford the corresponding quinolines in high yields.
certain phenylethers are heated at their boiling points, the non-aromatic group migrates from the oxygen to the nucleus. The more important groups which so migrate are allyl, benzyl and tert.- alkyl. If the rearrangement of some of these ethers is effected in a suitable solvent, the migrating group is transferred, in part, to the solvent. Thus by heating a quinoline solution of benzylphenyl ether, benzyl
作者:Rahul P.、Nitha P. R.、Vishnu K. Omanakuttan、Sheba Ann Babu、P. Sasikumar、Vakayil K. Praveen、Henning Hopf、Jubi John
DOI:10.1002/ejoc.202000365
日期:2020.5.29
A transition metal‐free superbase mediated indirectFriedländer reaction was developed for accessing functionalized quinolines using o‐aminobenzyl alcohol and ketones with an active methylene moiety. The reaction was employed in the functionalization of natural products and the applicability of the reaction for gram‐scale synthesis of quinolines was also demonstrated.
Regioselective synthesis of 2-(2-hydroxyaryl)pyridines from the reactions of benzynes with pyridine N-oxides
作者:Balagopal S. Shaibu、Rahul Kisan Kawade、Rai-Shung Liu
DOI:10.1039/c2ob26130h
日期:——
By modifying the conditions from those in Larock's reported synthesis of 3-(2-hydroxyaryl)pyridines from benzynes, and pyridine N-oxides, we altered the regioselectivity of the reaction toward an efficient synthesis of 2-substituted pyridines. The presence of ethyl propiolate altered the regioselectivity to afford 3-substituted pyridine products instead. We conducted appropriate control experiments