开发了一种一锅法制备2 H - azirine-2-羰基苯并三唑,该方法是通过苯并三唑与2 H -azirine-2-羰基氯的反应形成的,该反应是由Fe(II)催化的苯甲酰异构化生成的。 5-氯异恶唑。2 H-叠氮基-2-羰基苯并三唑与1,3-二酮的Co(II)催化反应以中等到良好的产率提供了2-(((苯并三唑-1-基)羰基)吡咯。碱促进的2-(((苯并三唑-1-基)羰基)吡咯与醛,酮,异氰酸酯和异硫氰酸酯的碱环合反应提供各种取代的吡咯并[1,2- c ]恶唑和1 H-吡咯并[1,2- c]咪唑衍生物,中等至高收率。这些加合物的6-酰基可被三氟甲磺酸除去,得到进一步的新的吡咯并稠合的O-和N-杂环,如6-未取代的吡咯并[1,2 - c ]恶唑-1(3 H)-和1 H-吡咯并[1,2- c ]咪唑-1,3(2 H)-二酮,而1 H-吡咯并[1,2- c ]咪唑-1,3(2 H当用POCl 3
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.
Reformatsky and Blaise reactions in flow as a tool for drug discovery. One pot diversity oriented synthesis of valuable intermediates and heterocycles
作者:L. Huck、M. Berton、A. de la Hoz、A. Díaz-Ortiz、J. Alcázar
DOI:10.1039/c6gc02619b
日期:——
The application of Reformatsky and Blaise reactions for the preparation of a diverse set of valuable intermediates and heterocycles in a one-pot protocol is described. To achieve this goal, a...
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
An unprecedented silver‐catalyzed difunctionalization of the isocyanogroup with cyclicoximes is described. This method allows efficient and atom‐economic assembly of a vast array of structurally novel and interesting pyrimidinediones, and tolerates a range of functionalities. The resulting products can be easily converted into some useful compounds. Furthermore, the method can also be applied for
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。