Regioselective lithium–halogen exchange and palladium-catalyzed cross-coupling reactions of 2,4-dihaloquinolines
摘要:
Lithium-halogen exchange of 2,4-dibromoquinolines proceeds regioselectively at C-4 and affords 4-substituted quinolines on quenching with electrophiles. Palladium-catalyzed cross-coupling reactions of 2-bromo-4-iodoquinoline provide 4-substituted 2-bromoquinoline derivatives. (c) 2005 Elsevier Ltd. All rights reserved.
Regioselective Sonogashira Couplings of 2,4-Dibromoquinolines. A Correction
摘要:
Heteronuclear multiple bond correlation (HMBC) was used to determine the regiochemical outcome of palladium-catalyzed carbon-carbon bond formation between 2,4-dibromoquinolines and terminal acetylenes. The observed regioselectivity of these coupling reactions is opposite to that reported in the literature for analogous reactions.