Expedient synthesis of new cinnoline diones by Ru-catalyzed regioselective unexpected deoxygenation-oxidative annulation of propargyl alcohols with phthalazinones and pyridazinones
A novel Rh(III)-catalyzed annulation of phthalazinones or pyridazinones with various allenes was developed, leading to the formation of indazole derivatives bearing a quaternary carbon in moderate to good yields. The targeted products were synthesized via sequential C–H activation and olefin insertion, followed by β-hydride elimination and intramolecular cyclization. The synthetic protocol proceeded
开发了一种新型 Rh( III ) 催化的酞嗪酮或哒嗪酮与各种丙二烯的环化反应,从而以中等至良好的产率形成带有季碳的吲唑衍生物。目标产物通过连续的C-H活化和烯烃插入,然后是β-氢化物消除和分子内环化来合成。合成方案有效地进行,具有广泛的官能团耐受性、高原子效率和高Z选择性。通过合成转化证明了该方法的实用性。
Rhodium-Catalyzed [4 + 1] Cyclization via C–H Activation for the Synthesis of Divergent Heterocycles Bearing a Quaternary Carbon
作者:Xiaowei Wu、Haitao Ji
DOI:10.1021/acs.joc.8b00397
日期:2018.4.20
development of an efficient approach to construct fused polycyclic systems bearing a quaternarycarbon center represents a great challenge to synthetic chemistry. Herein, we report a Rh(III)-catalyzed [4 + 1] annulation of propargyl alcohols with various heterocyclic scaffolds under an air atmosphere. Diverse fused heterocycles containing a quaternarycarbon center were obtained in moderate to good
myricetin containing pyridazinone were designed and synthesized from the natural product myricitrin, which were structurally characterized by nuclear magnetic resonance (NMR) spectroscopy and high-resolution mass spectrometry (HRMS), and the structure of A14 was further determined using an X-ray single crystal diffractometer. The in vivo anti-tobacco mosaic virus (TMV) activity was tested by the half-leaf
以天然产物杨梅苷为原料,设计合成了26个含有哒嗪酮的杨梅素衍生物,通过核磁共振(NMR)波谱和高分辨率质谱(HRMS)对其进行了结构表征,并利用X-质谱进一步确定了A14的结构。射线单晶衍射仪。采用半叶法测定体内抗烟草花叶病毒(TMV)活性,结果表明A4、A23和A26具有较好的治疗活性,有效浓度50%(EC 50 )分别为131.6、138.5和118.9。 μg mL -1,分别优于宁南霉素(NNM)(235.6 μg mL -1)。A24和A26具有更好的保护活性,EC 50值为117.4和162.5 μg mL -1,优于NNM(263.2 μg mL -1)。微量热电泳(MST)和分子对接实验表明A23和A26与TMV-CP具有很强的结合能力。经A26处理后,烟叶叶绿素含量显着高于对照组,丙二醛含量增长速度减慢。这进一步证实了该药物分子具有良好的抗病毒活性。
Synthesis and biological evaluation of new 6-hydroxypyridazinone benzisoxazoles: Potential multi-receptor-targeting atypical antipsychotics
In recent years, multi-targeting directed ligands have attracted great interest as possible new atypical antipsychotics. Combinations of dopamine and serotonin receptor ligands within single molecules might afford new therapeutic opportunities. Herein, we describe the synthesis of a novel series of 6-hydroxypyridazinone benzisoxazoles and their binding behaviors to different receptors in terms of atypical antipsychotic behaviors. The most potent compound (46) exhibited excellent affinities for certain receptors (D-2, K-i = 0.5 +/- 0.07 nM; 5-HT1A, K-i = 5.9 +/- 0.8 nM; 5-HT2A, K-i = 0.3 +/- 0.01 nM; 5-HT6, K-i = 0.5 +/- 0.04 nM) and combined with low affinities for the H-1, 5-HT2C, and adrenergic alpha(1) receptors. In contrast to risperidone, compound 46 exhibited a high cataleptic threshold; this may be useful in the development of a novel class of drugs treating schizophrenia. (C) 2016 Elsevier Masson SAS. All rights reserved.