A Concise Synthesis of All Four Possible Benzo[4,5]furopyridines via Palladium-Mediated Reactions
作者:Wen Song Yue、Jie Jack Li
DOI:10.1021/ol0260425
日期:2002.6.1
gamma-activation of chloropyridines as well as palladium-mediated reactions, all four possible benzo[4,5]furopyridine tricyclic heterocycles, benzo[4,5]furo[2,3-b]pyridine, benzo[4,5]furo[2,3-c]pyridine, benzo[4,5]furo[3,2-c]pyridine, and benzo[4,5]furo[3,2-b]pyridine, are efficiently synthesized from 2-chloro-3-iodopyridine, 3-chloro-4-stannylpyridine, 4-chloro-3-iodopyridine, and 2-chloro-3-hydroxypyridine, respectively
[反应:查看文字]通过利用氯吡啶的α-活化和γ-活化以及钯介导的反应,所有四个可能的苯并[4,5]呋喃吡啶三环杂环,苯并[4,5]呋喃[2, 3-b]吡啶,苯并[4,5]呋喃[2,3-c]吡啶,苯并[4,5]呋喃[3,2-c]吡啶和苯并[4,5]呋喃[3,2 -b]吡啶分别由2-氯-3-碘吡啶,3-氯-4-苯乙烯吡啶,4-氯-3-碘吡啶和2-氯-3-羟基吡啶有效地合成。