[EN] PENTYLENETETRAZOLE DERIVATIVES [FR] DÉRIVÉS DE PENTYLÈNETÉTRAZOLE
摘要:
提供的化合物具有以下式I的结构:( l ) 其中R1、R2、R3、R4、R5、R6、R7、R8、R9和R10如本文所述,或其药用盐。还提供包含这些化合物的药物组合物及其使用方法,例如用于治疗老年痴呆、老年混淆、精神病、神经症,当焦虑和紧张存在时,脑动脉硬化、恶心、抑郁、疲劳、虚弱、轻微行为障碍、易怒、情绪不稳定、反社会态度、焦虑、眩晕或失禁,或其症状,或用于改善个体的认知功能,例如用于唐氏综合症患者和其他情况的个体。
Mechanism of Ni-Catalyzed Oxidations of Unactivated C(sp<sup>3</sup>)–H Bonds
作者:Yehao Qiu、John F. Hartwig
DOI:10.1021/jacs.0c09157
日期:2020.11.11
of ligands, the formation of carbon-centered radicals with long lifetimes, and the decomposition of mCPBA in the presence of Ni complexes suggest that the reaction occurs through free alkylradicals. Selectivity on model substrates and deuterium-labeling experiments imply that the m-chlorobenzoyloxy radical derived from mCPBA cleaves C-H bonds in the alkane to form an alkylradical, which subsequently
在温和的条件下,间氯过苯甲酸 (mCPBA) 对未活化烷烃的镍催化氧化,包括聚乙烯的氧化,周转率很高,但这种转变的机制一直是一个争论的话题。已提出推定的高价镍-氧代或镍-氧基中间体来裂解 C-H 键,但对此类复合物的几项研究并未提供强有力的证据来支持对未活化的 C(sp3)-H 键的这种反应性。我们报道了 mCPBA 对 Ni 催化的未活化 C-H 键氧化的机理研究。缺乏配体的作用,形成具有长寿命的碳中心自由基,以及在 Ni 配合物存在下 mCPBA 的分解,表明该反应是通过游离烷基自由基发生的。对模型底物和氘标记实验的选择性意味着,源自 mCPBA 的间氯苯甲酰氧基自由基裂解烷烃中的 C-H 键以形成烷基自由基,随后与 mCPBA 反应以获得醇产物并再生芳氧基自由基。这种自由基链机制表明 Ni 不会像以前提出的那样裂解 C(sp3)-H 键;相反,它催化 mCPBA 分解形成芳基自由基。
Efficient Benzylic and Aliphatic C–H Oxidation with Selectivity for Methylenic Sites Catalyzed by a Bioinspired Manganese Complex
作者:Duyi Shen、Chengxia Miao、Shoufeng Wang、Chungu Xia、Wei Sun
DOI:10.1021/ol4037083
日期:2014.2.21
A benzimidazole-based nonheme manganese complex efficiently catalyzes benzylic, aliphatic C–H as well as tertiary C–H oxidation with hydrogen peroxide as the oxidant in the presence of acetic acid as additive. 18O labeling experiments suggest the reaction may proceed via a high-valent manganese-oxo intermediate.
A new iron complex mediates stereospecifichydroxylation of alkyl C-H bonds with hydrogen peroxide, exhibiting excellent efficiency. Isotope labelling studies provide evidence that the relative reactivity of tautomerically related oxo-iron species responsible for the C-H hydroxylation reaction is dominated by steric factors.
One-Pot Synthesis of Silylated Enol Triflates from Silyl Enol Ethers for Cyclohexynes and 1,2-Cyclohexadienes
作者:Kazuki Inoue、Ryo Nakura、Kentaro Okano、Atsunori Mori
DOI:10.1002/ejoc.201800353
日期:2018.7.6
Regiocontrolled synthesis of precursors for strained cyclohexynes and 1,2‐cyclohexadienes is described based on one‐pot rearrangement of a silyl group followed by the formation of enoltriflates. The transient α‐silylated lithium enolate was smoothly isomerized in the presence of stoichiometric amount of water within one hour at room temperature to provide precursors for cyclohexyne.