Synthesis of 8-heteroaryl nitroxoline analogues via one-pot sequential Pd-catalyzed coupling reactions
作者:Helena Brodnik、Franc Požgan、Bogdan Štefane
DOI:10.1039/c5ob02364e
日期:——
A series of 8-heteroaryl substituted quinolines were prepared, either by direct C–H arylation of five-membered heteroarenes, or Pd-catalyzedcoupling of organoboron reagents with bromoquinolines. The use of (benzo)thiophenyl or (benzo)furanyl boron coupling partners allowed further C–H functionalization on the five-membered heteroaryl ring with aryl bromides in one flask to access a variety of polyconjugated
reactivity of C2‐quinoline‐substituted furan, thiophene and pyrrole derivatives in palladium‐catalyzed direct C–H arylation. The regioselectivity of the reaction was strongly influenced by site position of the attached five‐membered heterocycle thus giving rise to C3‐ and/or C5‐arylated products. Furthermore, the Hammett correlation performed on 5‐substituted‐8‐(furan‐2‐yl)quinolines indicates that a marginally