Rhodium-Catalyzed Dehydrogenative Annulation of <i>N</i>-Arylmethanimines with Vinylene Carbonate for Synthesizing Quinolines
作者:Yan Hu、Jiang Nan、Jiacheng Yin、Guanjie Huang、Xin Ren、Yangmin Ma
DOI:10.1021/acs.orglett.1c03231
日期:2021.11.5
Here we report a novel Rh-catalyzed C−H/C−H alkenylation of N-arylmethanimines with vinylenecarbonate acting as a vinylene unit. Forty examples of C3,C4-nonsubstituted quinolines were achieved from commercially available starting materials. This identified process features an exceedingly simple system, a lower loading of catalyst, and the capacity for postfunctionalization with bioactive molecules
A strategy for one-pot synthesis of isoindoles is described via a catalytic multicomponent dehydrogenative annulation of diarylimines, vinyl ketones and simple amines. In the presence of a rhodium catalyst and Cu oxidant, four C–H and two N–H bonds are activated along with the formation of one new C–C and two new C–N bonds, leading to a series of isoindole derivatives in good to very high isolated
A copper-catalyzed three component C-S/C-N coupling reaction of imines with sulfur and CFC-113a was developed. The reaction involves amination and C = S double bond formation of CFC-113a, leading to biologically important trifluorothioacetamides. The method features efficient construction of trifluorothioacetyl moiety from cheap sulfur and CFC-113a, and safe disposal for environmentally persistent Freon.
10.1002/chem.202401034
作者:Weindl, Christian、Hintermann, Lukas
DOI:10.1002/chem.202401034
日期:——
AbstractSyntheses of (partially) aromatic nitrogen heterocycles increasingly rely on transition‐metal catalyzed C−C‐ and C−N‐cross‐coupling reactions. Here we describe a different approach to the synthesis of indolines by a domino C(sp3)−H activation, 1,2‐addition, and defluorinative SNAr‐cyclization sequence to provide the target 1,2‐diarylindolines (1,2‐diaryl‐2,3‐dihydroindoles) from ortho‐fluorinated methyl‐arenes and N‐aryl imines (benzylidene anilines) in a cyclocondensation that is mediated by potassium hexamethyldisilazide (KHMDS) as base exclusively. This transition‐metal‐free process via C−H and C−F bond activation provides a one‐step entry into a wide array of indoline scaffolds (43 examples, up to 96 % yield). This privileged substructure is common in natural products and pharmaceuticals alike, and cannot be accessed by traditional condensation reactions.
A Manganese Nanosheet: New Cluster Topology and Catalysis
作者:Uttam Chakraborty、Efrain Reyes-Rodriguez、Serhiy Demeshko、Franc Meyer、Axel Jacobi von Wangelin
DOI:10.1002/anie.201800079
日期:2018.4.23
and the surface characteristics of larger metal particles are well understood, preparations of molecular metallic nanoclusters remain a great challenge. Discrete planar metal clusters constitute nanoscale snapshots of cluster growth but are especially rare owing to the strong preference for three‐dimensional structures and rapid aggregation or decomposition. A simple ligand‐exchange procedure has led