New enediyne derivatives: synthesis of symmetrically and unsymmetrically disubstituted 4,5-dialkynyl-3(2H)-pyridazinones
作者:Omar R'kyek、Bert U.W Maes、Tim H.M Jonckers、Guy L.F Lemière、Roger A Dommisse
DOI:10.1016/s0040-4020(01)01030-4
日期:2001.12
(7a–c) and 4-alkynyl-5-chloro-2-methyl-3(2H)-pyridazinones (3a,c,e), respectively. Compounds 7a–c and 3a,c,e were subjected to a second Sonogashira reaction giving 4,5-dialkynyl-2-methyl-3(2H)-pyridazinones (8a–c) bearing two different acetylene substituents. Suzuki cross-coupling reaction was also achieved on compounds 7a and 3a producing 4-aryl-5-phenylethynyl- and 5-aryl-4-phenylethynyl-2-methyl-3(2H)-pyridazinones
通过在4,5-二氯-2-(甲基或苯基)-上的Sonogashira交叉偶联反应有效地制备了4,5-二炔基-2-(甲基或苯基)-3(2 H)-哒嗪酮(2a – c)。 3(2 H)-哒嗪酮(1a,b)。在4-氯-2-甲基-5-三氟甲磺酰氧基-(6)和5-氯-2-甲基-4-三氟甲磺酰氧基-3(2 H)-哒嗪酮(11)上成功完成了选择性Sonogashira反应,生成了5-炔基-4-氯-(7a - c)和4-炔基-5-氯-2-甲基-3(2 H)-哒嗪酮(3a,c,e)。对化合物7a – c和3a,c,e进行第二次Sonogashira反应,得到带有两个不同乙炔取代基的4,5-二炔基-2-甲基-3(2 H)-哒嗪酮(8a – c)。在化合物7a和3a上也实现了铃木交叉偶联反应,分别以优异的产率产生4-芳基-5-苯基乙炔基-和5-芳基-4-苯基乙炔基-2-甲基-3(2H)-吡啶并壬二酮。