Pyridazine derivatives. Part 39: Reactivity of 5-iodopyridazin-3(2H)-ones in palladium-catalysed reactions
作者:Alberto Coelho、Eddy Sotelo、Héctor Novoa、Oswald M. Peeters、Norbert Blaton、Enrique Raviña
DOI:10.1016/j.tet.2004.10.014
日期:2004.12
antiplatelet agents, convenient and efficient methods for the preparation of 2,5-disubstituted pyridazin-3(2H)-ones are reported that utilise palladium-catalysed cross-coupling reactions. A post-coupling base-promoted isomerisation has been observed during Sonogashira alkynylation of 5-iodopyridazin-3(2H)-ones (3) with 1-phenyl-2-propyn-1-ol. Variable amounts of phthalazinones were isolated as by-products during
在寻找新的抗血小板药中,据报道利用钯催化的交叉偶联反应制备2,5-二取代的哒嗪-3(2 H)-1的方便,有效的方法。在5-碘吡啶并嗪-3(2 H)-ones(3)与1-苯基-2-丙炔-1-醇的Sonogashira炔基化过程中,观察到了偶联后的碱基促进的异构化。在3的Heck烯基化过程中,副产物的量不同的邻苯二氮酮被分离出来。羟甲基片段作为5-取代哒嗪-3(2 H)-ones合成过程中的保护基的有效性已得到验证。