The palladium-catalyzed intramolecularoxidative C–H/C–H coupling of 2-aryloxypyridines as challenging substrates is investigated to construct an important class of N,O-mixed heteroacenes, i.e. benzofuropyridines. It is found that 2,6-diaryloxypyridines efficiently undergo double cyclization to provide bisbenzofuro[2,3-b:3′,2′-e]pyridines of interest in materials chemistry.
研究了钯催化的2-芳氧基吡啶的分子内氧化C–H / C–H偶联作为具有挑战性的底物,以构建一类重要的N,O杂杂蒽,即苯并呋喃并吡啶。已发现2,6-二芳基氧基吡啶有效地经历双环化以提供在材料化学中感兴趣的双苯并呋喃[2,3- b:3',2'- e ]吡啶。