cross-coupling reactions of halo derivatives of 4H-pyrido[1,2-a]pyrimidin-4-one with (het)arylboronic acids allow easy access to (het)aryl and vinyl derivatives of this bicycle in good to excellent yields, even from chloro derivatives. The sequence of reactivity of the halogen in the different positions of the ring system was also investigated. 6-Phenyl-4H-pyrido[1,2-a]pyrimidin-4-one could be prepared by thermal
钯催化的卤素衍生物的Suzuki-Miyaura交叉偶联反应 4 H-吡啶并[1,2- a ]嘧啶-4-一与(杂)芳基硼酸一起使用,即使从氯代衍生物中也可以很容易地获得该自行车的(杂)芳基和乙烯基衍生物。还研究了卤素在环系统不同位置的反应顺序。6-苯基-4 H-吡啶并[1,2- a ]嘧啶-4-一 可以通过热环化制备 异亚丙基(6-苯基吡啶-2-基氨基)亚甲基丙二酸酯,以及少量的7-苯基-1,4-二氢-1,8-萘啶-4-酮。
Synthesis of Halogenated 4H-Pyrido[1,2-a]pyrimidin-4-ones
作者:István Hermecz、Annamária Molnár、Ferenc Faigl、Benjamin Podányi、Zoltán Finta、László Balázs
DOI:10.3987/com-09-11746
日期:——
4-diones. The latters formed from N-(2-pyridyl)iminoketenes, the common intermediates of 4H-pyrido[1,2-a]pyrimidin-4-one and 1,8-naphthyridin-4-ones, via a "head-to-tail" [4+2] cycloaddition. 3-Halo-4H-pyrido[1,2-a]pyrimidin-4-ones were obtained from 4H-pyrido[1,2-a]pyrimidin-4-one with N-halosuccinimides. The structures of the new compounds were characterized by means of 1 H NMR and 13 C NMR examinations
The present invention relates to metal complexes and to electronic devices, especially organic electroluminescent devices, comprising these metal complexes, especially as emitters, and in particular monometallic metal complex containing a hexadentate tripodal ligand in which three bidentate sub-ligands coordinate to a metal and the three bidentate sub-ligands, which may be the same or different, are joined via a bridge.