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.
Regioselective alkynylation followed by Suzuki coupling of 2,4-dichloroquinoline: Synthesis of 2-alkynyl-4-arylquinolines
作者:Ellanki Amarender Reddy、Aminul Islam、K Mukkanti、Venkanna Bandameedi、Dipal Ranjan Bhowmik、Manojit Pal
DOI:10.3762/bjoc.5.32
日期:——
A two step synthesis of 2-alkynyl-4-arylquinolines has been accomplished via Pd/C-mediated regioselective C-2 alkynylation of 2,4-dichloroquinoline in water followed by Suzuki coupling at C-4 of the resulting 4-chloro derivative.