Direct heteroarylation of 5-bromothiophen-2-ylpyridine and of 8-bromoquinoline via palladium-catalysed C–H bond activation: simpler access to heteroarylated nitrogen-based derivatives
The palladium-catalyseddirect heteroarylation of the pyridyl-containing substrates, 2-(5-bromothiophen-2-yl)pyridine and 8-bromoquinoline, proceeds in moderate to high yields with a variety of heteroarenes in the presence of 1–2 mol% of a palladium catalyst. This approach allows the access to polyheteroaromatics which are interesting building blocks as (N⁁C)-chelate ligands. The reaction proceeds
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 the thiolate complexes [Fe2(μ-LR)(CO)5] and [Fe3(μ-LR)(CO)8]. Although the photoreactions of the diiron complexes [Fe2(μ-LR)(CO)5] with [Fe(CO)5] produced the corresponding triiron complexes [Fe3(μ-LR)(CO)8], desulfurization leading to the formation of [Fe2CHCHCHC(Q)}(CO)5] was predominant for R = H, and a fast conversion of the triiron complex to a CO elimination product was observed for R =