Studies on quinoline and isoquinoline derivatives. VIII. Hydration and hydrogenation of ethynyl substituents attached to the pyridine moiety of quinoline and isoquinoline rings.
developed capitalizing on a direct pyridine-type nitrogen quaternization followed by metal-catalyzed [2+2+2] cycloaddition with gaseous acetylene. The flexibility of the route is demonstrated on 12 diverse scaffolds based on pyridinium, quinolinium, thiazolium, benzothiazolium, imidazolium, and pyrimidinium. Electrochemical study revealed a quinolinium redox system with two electrochemically distinct forms
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.