Rh(III)-Catalyzed Regioselective Annulations of 3-Arylisoxazolones and 3-Aryl-1,4,2-dioxazol-5-ones with Propargyl Alcohols: Access to 4-Arylisoquinolines and 4-Arylisoquinolones
The Rh(III)-catalyzed dual directing group assisted C–H activation/annulation of 3-arylisoxazolones with propargyl alcohols has been developed, which expands the application scope of isoxazolones in organic synthesis. This protocol also worked well with 3-aryl-1,4,2-dioxazol-5-ones to produce synthetically and biologically important 4-arylisoquinolones.
Rh(III)-Catalyzed [4 + 2] Annulation of 3-Aryl-5-isoxazolone with Maleimides or Maleic Ester
作者:Ting Wan、Chao Pi、Yangjie Wu、Xiuling Cui
DOI:10.1021/acs.orglett.0c02283
日期:2020.8.21
The Rh(III)-catalyzed [4 + 2] annulation of 3-aryl-5-isoxazolones with maleimides or maleic ester has been developed, which gives synthetically important 3,4-dihydroisoquinoline derivatives in good to excellent yields. This facile protocol can tolerate a variety of functional groups, and CO2 was produced as the predominant byproduct. Notably, a C–C bond and a C–N bond were formed simultaneously. This
Construction of isoxazolone-fused phenanthridines <i>via</i> Rh-catalyzed cascade C–H activation/cyclization of 3-arylisoxazolones with cyclic 2-diazo-1,3-diketones
A Rh(III)-catalyzed cascade C–H activation/intramolecular cyclization of 3-aryl-5-isoxazolones with cyclic 2-diazo-1,3-diketones was described, leading to the formation of isoxazolo[2,3-f]phenanthridine skeletons. The protocol features the simultaneous one-potformation of two new C–C/C–N bonds and one heterocycle in moderate-to-good yields with good functional group compatibility. It is amenable to
描述了Rh(III)催化的3-芳基-5-异恶唑酮与环2-重氮-1,3-二酮的级联C–H活化/分子内环化,导致异恶唑[2,3- f ]的形成菲啶骨架。该协议的特征是同时一锅形成两个新的C–C / C–N键和一个杂环,具有中等至良好的产率,并具有良好的官能团相容性。适于大规模合成和进一步转化。
Studies on heterocyclic chemistry—V
作者:T. Nishiwaki、T. Kitamura、A. Nakano
DOI:10.1016/s0040-4020(01)97842-1
日期:1970.1
It has been revealed that 1-azirines having an ester function at C can be synthesized by the thermally induced skeletal rearrangement of 5-alkoxyisoxazoles and 5-alkylmercaptoisoxazles. Characterization of the azirines obtained was made by chemical reactions as well as by spectrometry. A further thermal transformation of azirine esters into oxazole derivatives could not be found. Mass spectra of representative
Difunctionalization of the Isocyano Group: Atom-Economic Synthesis of Pyrimidinediones
作者:Jian Lang、Ye Wei
DOI:10.1055/s-0037-1610348
日期:2019.2
the nitrogen and carbons atoms of the isocyanogroup would largely enrich the structural diversity of compounds. Herein, we disclosed a silver-catalyzeddifunctionalization of the isocyanogroup with cyclicoximes. This method can generate a great array of structurally novel and interesting pyrimidinediones and features excellent atom economy, good functional group compatibility, and amenability to late-stage