AbstractA ruthenium‐catalysed dehydrogenative cross‐coupling of primary alcohols and imines in the presence of TFA provided a library of differently substituted quinolines. Imines can be prepared in situ from various anilines and several benzyl alcohols using a ruthenium‐catalysed hydrogen‐transfer procedure. Without changing the catalyst, quinolines can be obtained in moderate to good yields by adding various primary alcohols in the presence of TFA (30 mol%) via a “telescopic” protocol. The use of alcohols, the absence of strong oxidants and the diversity of potential starting materials make this modern version of the Skraup reaction superior to most of the conventional quinoline syntheses.magnified image
Practical and Simple Synthesis of Substituted Quinolines by an HCl−DMSO System on a Large Scale: Remarkable Effect of the Chloride Ion
作者:Shin-ya Tanaka、Makoto Yasuda、Akio Baba
DOI:10.1021/jo052004y
日期:2006.1.1
A variety of substituted quinolines are synthesized from imines and enolizable carbonyl compounds under aerobic conditions, in which only water is a byproduct. In DMSO, a catalytic amount of HCl activates carbonyl compounds quite effectively to give the quinolines. A simple and practical procedure is demonstrated on a large scale.
A Mild and Efficient Synthesis of Substituted Quinolines<i>via</i>a Cross-Dehydrogenative Coupling of (Bio)available Alcohols and Aminoarenes
作者:Manuel G. Mura、Suvi Rajamäki、Lidia De Luca、Elena Cini、Andrea Porcheddu
DOI:10.1002/adsc.201400815
日期:2015.2.9
AbstractA ruthenium‐catalysed dehydrogenative cross‐coupling of primary alcohols and imines in the presence of TFA provided a library of differently substituted quinolines. Imines can be prepared in situ from various anilines and several benzyl alcohols using a ruthenium‐catalysed hydrogen‐transfer procedure. Without changing the catalyst, quinolines can be obtained in moderate to good yields by adding various primary alcohols in the presence of TFA (30 mol%) via a “telescopic” protocol. The use of alcohols, the absence of strong oxidants and the diversity of potential starting materials make this modern version of the Skraup reaction superior to most of the conventional quinoline syntheses.magnified image