3-b]pyridines through a coupling/cyclization process. Two catalyst systems have been used: PdCl 2 (PPh 3 ) 2 -CuI and Pd 2 (dba) 3 -P(t-Bu) 3 . Halopyridinols have been employed for an alternative approach to 2-substituted furo[2,3-b]pyridines and 2-substituted furo[2,3-c]pyridines via 2-(trimethylsilyl)furopyridines, 2-iodofuropyridines, palladiumcatalyzed reactions.
2-Ethynyl-3-pyridinol 和 3-ethynyl-2-pyridinol 很容易从卤代
吡啶醇中获得,已经用芳基/杂芳基卤化物或
乙烯基三氟甲磺酸酯处理得到 2-取代的
呋喃 [3,2-b]
吡啶和 2-取代
呋喃[2,3-b]
吡啶通过偶联/环化过程。已经使用了两种催化剂体系:PdCl 2 (PPh 3 ) 2 -CuI和Pd 2 (dba) 3 -P(t-Bu) 3 。卤代
吡啶醇已被用于通过 2-(三甲基甲
硅烷基)
呋喃吡啶、
2-碘呋喃吡啶、
钯催化反应生成 2-取代
呋喃 [2,3-b]
吡啶和 2-取代
呋喃 [2,3-c]
吡啶的替代方法。