Ag-Catalyzed Insertion of Alkynyl Carbenes into C–C Bonds of β-Ketocarbonyls: A Formal C(sp<sup>2</sup>) Insertion
作者:Yongquan Ning、Qingmin Song、Paramasivam Sivaguru、Lizuo Wu、Edward A. Anderson、Xihe Bi
DOI:10.1021/acs.orglett.1c04081
日期:2022.1.21
Here we report a silver-catalyzed alkynyl carbene insertion into β-ketocarbonyls using alkynyl N-nosylhydrazones as alkynyl carbene precursors, which provides access to trisubstituted allenyl ketones. This reaction represents the first example of an alkynyl carbene insertion into a C–C σ bond, affording products homologated with an sp2 carbon center. The products are useful substrates for further transformations
Silver-catalyzed cyclopropanation of alkenes with alkynyl <i>N</i>-nosylhydrazones leading to alkynyl cyclopropanes
作者:Yongquan Ning、Mengtian Huo、Lizuo Wu、Xihe Bi
DOI:10.1039/d2cc00099g
日期:——
Here, a novel method for the stereoselective synthesis of alkynyl cyclopropanes, by the silver-catalyzed alkynylcyclopropanation of alkenes using alkynyl N-nosylhydrazones as alkynyl carbene precursors, is reported.
Cyclization–carbonylation–cyclization coupling reaction of α,β-alkynic hydrazones with palladium(ii)-bisoxazoline catalyst
作者:Taichi Kusakabe、Hiroshi Sagae、Keisuke Kato
DOI:10.1039/c3ob40913a
日期:——
A cyclizationâcarbonylationâcyclization coupling reaction (CCC-coupling reaction) of α,β-alkynic hydrazones, catalyzed by (box)PdII complexes, afforded symmetrical ketones bearing two pyrazole groups in good to excellent yields. This method is applicable to a broad range of substrates.
Recyclable Copper(I)-Catalyzed Cross-Coupling of Trialkylsilylethynes and <i>N</i>-Tosylhydrazones Leading to the Formation of C(sp)–C(sp<sup>3</sup>) Bonds
作者:Qian Ye、Wencheng Huang、Li Wei、Mingzhong Cai
DOI:10.1021/acs.joc.2c02691
日期:2023.3.3
A highly efficient heterogeneous copper(I)-catalyzed cross-coupling of trialkylsilylethynes with N-tosylhydrazones has been achieved in dioxane at 90–110 °C via the Cu carbenemigratoryinsertion with an SBA-15-immobilized l-proline-Cu(I) complex [SBA-15-l-Proline-CuI] as the catalyst and LiOtBu as the base, leading to the formation of C(sp)–C(sp3) bonds. The reaction generates a wide variety of a
通过 Cu 卡宾迁移插入和 SBA-15-固定的l-脯氨酸-Cu (I ) 络合物 [SBA-15- l -Proline-CuI] 作为催化剂和 LiO t Bu 作为碱,导致 C(sp)–C(sp 3 ) 键的形成。该反应以中高产率生成多种烷基三烷基甲硅烷基炔烃。这种新型多相铜 (I) 配合物具有与均相 CuI 相当的催化效率,并且可以通过简单的离心过程轻松回收,并且可回收多达 12 次而不会显着损失活性。