DDQ-Mediated Oxidative Radical Cycloisomerization of 1,5-Diynols: Regioselective Synthesis of Benzo[<i>b</i>]fluorenones under Metal-Free Conditions
作者:Hui Zhu、Zhiyuan Chen
DOI:10.1021/acs.orglett.5b03533
日期:2016.2.5
has been developed. The reaction proceeds under metal-free reaction conditions with high efficiency and broad functional group tolerance, which offers a general and straightforward access to benzo[b]fluorenones under metal-free conditions. The preliminary mechanistic studies revealed the possible involvement of a Meyer–Schuster rearrangement combined with an oxidative radical cyclization.
已经开发了无环1,5-二炔醇的区域和化学选择性氧化环异构化反应。该反应在无金属的反应条件下进行,具有较高的效率和宽泛的官能团耐受性,这为在无金属的条件下提供一般直接的苯并[ b ]芴酮的途径。初步的机理研究表明,梅尔-舒斯特重排与氧化自由基环化相结合的可能性。
作者:Kanagaraj Naveen、Paramasivan Thirumalai Perumal、Deug-Hee Cho
DOI:10.1021/acs.orglett.9b01543
日期:2019.6.7
A Pd-catalyzed domino process involving a double norbornene insertion/annulation reaction was developed for the expeditious synthesis of overcrowded olefins. In this one-pot reaction, four new C–C bondformations were achieved by three consecutive Heck carbopalladations and C–H activation across the C≡C triple bond of 2-alkynyl bromobenzenes with two norbornene rings via a reactive vinylic-Pd(II) species
Here we demonstrate that merging photoredox catalysis with Lewisacidcatalysis provides fundamentally newactivationmode of C-C triple bond to achieve the bond-forming reaction of alkynes with weak nucleophiles....
unprecedented (SiMOS-Phos) ligand-controlled Rh-catalyzed hydrosilylation of “silicon-centered” racemic hydrosilanes was developed for the highly efficient and enantioselective construction of silicon-stereogenic centers of benzosiloles (up to 96 : 4 er). This achievement was obtained by using an original synthetic strategy involving dynamic kinetic asymmetric transformations.
An Extremely Simple Dibenzopentalene Synthesis from 2-Bromo-1-ethynylbenzenes Using Nickel(0) Complexes: Construction of Its Derivatives with Various Functionalities
Nice and easy: A very simple synthesis for dibenzopentalenes, which starts from 1‐bromo‐2‐ethynylbenzenes, has been developed. It uses Ni0 complexes (see scheme), from which a relatively stable NiII complex as an important intermediate has been isolated. Dibenzopentalenes with various functional groups can be prepared by the procedure, and their electronic properties are consistent with theoretical