Site-Selective C–H Functionalization of (Hetero)Arenes via Transient, Non-symmetric Iodanes
作者:Stacy C. Fosu、Chido M. Hambira、Andrew D. Chen、James R. Fuchs、David A. Nagib
DOI:10.1016/j.chempr.2018.11.007
日期:2019.2
A strategy for C–Hfunctionalization of arenes and heteroarenes has been developed to allow site-selective incorporation of various anions, including Cl, Br, OMs, OTs, and OTf. This approach is enabled by in situ generation of reactive, non-symmetric iodanes by combining anions and bench-stable PhI(OAc)2. The utility of this mechanism is demonstrated via para-selective chlorination of medicinally relevant
Asymmetric Synthesis of N–N Axially Chiral Compounds by Phase-Transfer-Catalyzed Alkylations
作者:Ming Pan、Ying-Bo Shao、Qun Zhao、Xin Li
DOI:10.1021/acs.orglett.1c04028
日期:2022.1.14
N–N axially chiral skeletons are significant structural motifs in natural products, pharmaceuticals, and functional materials. Herein we disclose a method for the asymmetric synthesis of N–N axially chiral compounds by phase-transfer catalysis. A wide range of N–N axially chiral quinazolinone derivatives were prepared in high yields with excellent stereoselectivities. Furthermore, the synthetic utility
A Lewis base catalyst Trip-SMe (Trip = triptycenyl) for electrophilic aromatic halogenationusing N-halosuccinimides (NXS) is introduced. In the presence of an appropriate activator (as a non-coordinating-anion source), a series of unactivated aromatic compounds were halogenated at ambient temperature using NXS. This catalytic system was applicable to transformations that are currently unachievable
Ligand Promoted Olefination of Anilides for Indirectly Introducing Fluorinated Functional Groups via Palladium Catalyst
作者:Dongjie Wang、Xu Xu、Jingyu Zhang、Yingsheng Zhao
DOI:10.1021/acs.joc.0c02701
日期:2021.2.5
We report a palladium-catalyzed, ligand promoted, C–H fluorine-containing olefination of anilides with 4-bromo-3,3,4,4-tetrafluorobutene as the fluorinated reagent, which has a potential transformation into other compounds due to its -CF2CF2Br functional group. -CF2CF2H was obtained by using the mild reducing agent sodium borohydride. Bioactivecompounds such as aminoglutethimide derivative and propham
Synthesis and Structure-Activity Relationships of N-Substituted 2-((2-Imidazolylsulfinyl)methyl)anilines as a New Class of Gastric H+/K+-ATPase Inhibitors.
activity against gastricH+/K(+)-ATPase prepared from rabbit stomach and gastric acid secretions in Heidenhain pouch dogs. Monoalkyl substituents on the nitrogen atom of the aniline moiety markedly inhibited the enzyme activity to the same degree as omeprazole, a representative H+/K(+)-ATPaseinhibitor. Most of these compounds, administered at 3 mg/kg i.v. inhibited histamine-stimulated gastric acid secretion