Studies on quinoline and isoquinoline derivatives. VIII. Hydration and hydrogenation of ethynyl substituents attached to the pyridine moiety of quinoline and isoquinoline rings.
sequence based on two‐fold quaternization followed by the key intramolecular [2+2+2] alkyne cycloaddition. The physico‐chemical properties of four new linquats were characterized by spectroscopic methods, X‐ray crystallography, and electrochemistry complemented by information obtained from DFT calculations. Electron deficient N‐heteroaromatic cations with linear extended diquat motif with high electron
Rhodium-Catalyzed Addition of Arylboronic Acids to Alkynyl Aza-Heteroaromatic Compounds in Water
作者:Mark Lautens、Masahiro Yoshida
DOI:10.1021/jo0205255
日期:2003.2.1
Alkynyl heteroaromatic compounds reacted with arylboronic acids to give addition products in the presence of a rhodium catalyst. The best results were obtained when a novel pyridine-substituted water-soluble phosphine ligand was used. The reactions proceed to give trisubstituted alkenes from various arylboronic acids and alkynyl heteroaromatic compounds with high regioselectivity. Only alkynes with
Facile palladium-mediated substitution of chlorine in 2-chloroquinolines
作者:Marco A. Ciufolini、James W. Mitchell、Frank Roschangar
DOI:10.1016/0040-4039(96)01937-5
日期:1996.11
Unlike ordinary aryl chlorides, the title hererocycles participate readily in Castro-Stephens, Stille, Suzuki, and carbonylation reactions under the catalytic influence of Pd(0).
Regioselective Rhodium-Catalyzed Addition of Arylboronic Acids to Alkynes with a Pyridine-Substituted Water-Soluble Ligand
作者:Mark Lautens、Masahiro Yoshida
DOI:10.1021/ol010261t
日期:2002.1.1
[reaction: see text] Alkynyl heteroaromatic compounds reacted with arylboronic acids to give addition products in the presence of [Rh(COD)Cl](2) and pyridine-substituted water-soluble ligand. The reactions proceed to give trisubstituted alkenes with high regioselectivity.
Synthesis of 2-alkynylquinolines from 2-chloro and 2,4-dichloroquinoline via Pd/C-catalyzed coupling reaction in water
作者:Ellanki Amarender Reddy、Deepak Kumar Barange、Aminul Islam、K. Mukkanti、Manojit Pal
DOI:10.1016/j.tet.2008.05.097
日期:2008.7
The Pd/C-CuI-PPh3 catalyst system facilitated Sonogashira coupling of 2-chloroquinoline and 2,4-dichloroquinoline with terminal alkynes in water without generating any significant side products. A variety of 2-alkynylquinolines were prepared from 2-chloroquinoline in good to excellent yields and the 2,4-dichloroquinoline afforded monosubstituted product i.e., 2-alkynyl-4-chloro quinoline with high regioselectivity. The methodology was found to be effective for the alkynylation of 1-chloroisoquinoline and 3-methyl-2-chloroquinoline. (c) 2008 Elsevier Ltd. All rights reserved.