Synthesis of 1,4-Disubstituted Pyrido[1′,2′:1,5]pyrazolo[3,4-<i>d</i>]pyridazines by Means of S<sub>N</sub>Ar and Palladium-Catalysed Reactions
作者:Rabia Belaroussi、Ahmed El Hakmaoui、Nathalie Percina、Agnes Chartier、Mathieu Marchivie、Stéphane Massip、Christian Jarry、Mohamed Akssira、Gérald Guillaumet、Sylvain Routier
DOI:10.1002/ejoc.201500294
日期:2015.6
The first efficient synthesis of various 1,4-disubstituted pyrido[1′,2′:1,5]pyrazolo[3,4-d]pyridazines is reported. The reactivity toward chlorine release at the C-1 and C-4 positions was investigated. SNAr and palladium-catalysed cross-coupling reactions were carried out, and conditions were optimised for each procedure. 1,4-Bis(het)aryl derivatives were obtained under a Suzuki cross-coupling procedure
报道了各种 1,4-二取代吡啶并[1',2':1,5]吡唑并[3,4-d]哒嗪的首次有效合成。研究了在 C-1 和 C-4 位置释放氯的反应性。进行了 SNAr 和钯催化的交叉偶联反应,并针对每个程序优化了条件。1,4-双(杂)芳基衍生物是在铃木交叉偶联程序下获得的,而SNAr取代主要在C-1而不是C-4处实现。单取代的 C-4 吗啉衍生物用作起始材料以提供不对称的 1,4-二胺或 1-(杂)芳基-4-吗啉产物。