Fe-Catalyzed Reductive Couplings of Terminal (Hetero)Aryl Alkenes and Alkyl Halides under Aqueous Micellar Conditions
作者:Haobo Pang、Ye Wang、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1021/jacs.9b04510
日期:2019.10.30
aromatic or heteroaromatic and an alkyl bromide or iodide leads, in the presence of Zn and a catalytic amount of an Fe(II) salt, to a net reductive coupling. The new C-C bond is regiospecifically formed at rt at the -site of the al-kene. The coupling only occurs in an aqueous micellar medium, where an atypical carbanionic, as opposed to radical, process is likely, supported by several control experiments
在Zn和催化量的Fe(II)盐的存在下,乙烯基取代的芳族或杂芳族和烷基溴或碘的组合导致净还原偶联。新的 CC 键在 rt 在烯烃的 位点区域特异性地形成。偶联仅发生在水性胶束介质中,其中可能是非典型的碳负离子过程,而不是自由基过程,这得到了几个控制实验的支持。提出了一种基于这些数据的机制。
Manganese‐Catalyzed Hydroarylation of Unactivated Alkenes
作者:Ting Liu、Yunhui Yang、Congyang Wang
DOI:10.1002/anie.202003830
日期:2020.8.17
Transition‐metal‐catalyzed hydroarylation of unactivated alkenes with strategic use of remote coordinating functional groups has received significant attention recently to address the issues of both low reactivity and poor selectivity. The bidentate 8‐aminoquinoline amide group is the most successfully adopted in unactivated alkenes for Pd and Ni catalysis. We describe the first manganese‐catalyzed hydroarylation
Unlocking the Accessibility of Alkyl Radicals from Boronic Acids through Solvent-Assisted Organophotoredox Activation
作者:Prabhat Ranjan、Serena Pillitteri、Guglielmo Coppola、Monica Oliva、Erik V. Van der Eycken、Upendra K. Sharma
DOI:10.1021/acscatal.1c02823
日期:2021.9.3
acids (BAs) as alkylradical precursors in visible-light-assisted photocatalyzed reactions has been limited by their high oxidation potential. This study demonstrates the prominent ability of amide solvents, namely, N,N-dimethylacetamide, to participate in hydrogen-bonding interactions with BAs, thus enabling the modulation of their oxidation potential toward the generation of alkylradicals. The developed
尽管硼酸 (BA) 在有机合成中很流行,但硼酸 (BA) 作为烷基自由基前体在可见光辅助光催化反应中的应用受到其高氧化电位的限制。该研究证明了酰胺溶剂的突出能力,即N , N-二甲基乙酰胺,参与与 BA 的氢键相互作用,从而能够调节它们的氧化电位以产生烷基自由基。开发的协议简单而可靠,并证明了在间歇和连续流中烷基化、烯丙基化和消除反应的广泛适用性。对脱氢丙氨酸的应用允许合成非天然氨基酸。此外,在含硼酸酯分子的存在下,从 BA 化学选择性生成自由基物种现在是可行的,支持合理的硼选择性(生物)正交修饰。
Photoredox-catalysed regioselective synthesis of C-4-alkylated pyridines with <i>N</i>-(acyloxy)phthalimides
作者:Zhucheng Zhang、Qian He、Xiaofei Zhang、Chunhao Yang
DOI:10.1039/d2ob00123c
日期:——
method of direct C-4 selective alkylation of pyridines under visible light irradiation at room temperature has been reported, using simple maleate-derived pyridinium salts as pyridine precursors and the readily available carboxylic acid-derived N-(acyloxy)phthalimides as alkyl radical precursors, affording good to excellent yields without using stoichiometric oxidants and acids. A broad range of primary
Use of oxindole derivatives in the treatment of dementia related diseases, alzheimer's disease and conditions associated with glycogen synthase kinase-3
申请人:Berg Stefan
公开号:US20050070559A1
公开(公告)日:2005-03-31
The present invention relates to a new use of oxindole derivatives of formula I, as a free base or a pharmaceutically acceptable salt thereof, wherein R
1
, R
2
, R
3
, m and n arm as defined as in claim 1, as well as to new compounds, a process for their preparation and new intermediates used in the preparation thereof, pharmaceutical compositions containing said therapeutically active compounds and to the use of said active compounds in therapy, especially in the prevention and/or treatment of dementia related diseases, Alzheimer's Disease and conditions associated with glycogen synthase kinase-3.