Efficient Syntheses of New Heteroarotinoids through Functional Pyridylzinc Reagents and Palladium-Catalyzed Cross-Coupling Reactions
作者:Mouâd Alami、Jean-François Peyrat、Larbi Belachmi、Jean-Daniel Brion
DOI:10.1002/1099-0690(200111)2001:22<4207::aid-ejoc4207>3.0.co;2-3
日期:2001.11
rings in association with pyridyl or ethynylpyridyl moieties, from 6-bromo-2-pyridylzinc chloride (11) is described. This new functional heteroarylzinc reagent, readily accessible from 2,6-dibromopyridine, may undergo a selective palladium-catalyzed carbon−carbon bond-forming reaction to yield the corresponding 6-substituted-2-bromopyridines 13. Further manipulation of the remaining bromine atom in 13
描述了由 6-溴-2-吡啶基氯化锌 (11) 聚合合成带有色烯环和吡啶基或乙炔基吡啶基部分的杂芳烃类化合物 4、5a 和 5b。这种新的功能杂芳基锌试剂很容易从 2,6-二溴吡啶中获得,可以进行选择性钯催化的碳-碳键形成反应,以产生相应的 6-取代-2-溴吡啶 13。 13得到锌衍生物14,随后在钯催化条件下与4-碘苯甲酸乙酯偶联得到杂芳烃4。取代的溴吡啶13或三氟甲磺酸酯22与适当的炔烃在Sonogashira条件下偶联得到相应的杂芳烃5a、5b和6 .