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
One-Pot Regiospecific Synthesis of Indolizines: A Solvent-Free, Metal-Free, Three-Component Reaction of 2-(Pyridin-2-yl)acetates, Ynals, and Alcohols or Thiols
作者:Daji Yang、Yue Yu、Yuanheng Wu、Huiyi Feng、Xuechen Li、Hua Cao
DOI:10.1021/acs.orglett.8b00835
日期:2018.4.20
A novel approach for the synthesis of indolizines from 2-(pyridin-2-yl)acetates, ynals, and alcohols or thiols has been developed. This MCR (multicomponent reaction) that proceeds under the solvent- and metal-free conditions has provided a straightforward path to construct indolizines. Furthermore, this reaction demonstrates other attractive features such as widely available starting materials, mild
Silver-catalyzed [3 + 2] domino reaction: an efficient strategy to synthesize imidazole-5-carbaldehydes
作者:Changcheng Wang、Hangqi Jiang、Weifeng Chen、Jun Dong、Zhengwang Chen、Hua Cao
DOI:10.1039/c7ob01242j
日期:——
An unprecedented regioselective silver-catalyzed [3 + 2] domino reaction of amidines and ynals for the formation of C–N bonds has been developed. The reaction provided a new route to prepare imidazole-5-carbaldehydes which are important intermediates for the construction of fine chemicals. The reaction proceeds smoothly with a broad range of substrates to give imidazoles in good yields.
Substrate-Controlled Selectivity Switch in a Three-Component Reaction: A Ag-Catalyzed Strategy for the Synthesis of Functionalized Imidazoles
作者:Changcheng Wang、Enming Wang、Weixin Chen、Lijuan Zhang、Haiying Zhan、Yuanheng Wu、Hua Cao
DOI:10.1021/acs.joc.7b01781
日期:2017.9.1
An efficient Ag-catalyzed three-component reaction of amidines, ynals, and alcohols, phenols, or water has been developed. This strategy provides a wide range of substrates and represents a simple process for the preparation of different imidazole derivatives in good yields with high regioselectivities.
Iron(III)-catalyzed synthesis of 3-aroylimidazo[1,2-a]pyridines from 2-aminopyridines and ynals
作者:Zhengwang Chen、Botao Liu、Pei Liang、Zhixiong Yang、Min Ye
DOI:10.1016/j.tetlet.2018.01.018
日期:2018.2
An efficient iron-catalyzed intermolecular aminooxygenation of 2-aminopyridines with a wide range of ynals has been developed. 3-Aroylimidazo[1,2-a]pyridines containing various functional groups are synthesized under the standard conditions. The transformation is conducted in simple conditions and forms products in good yields.
已经开发了具有广泛的烯醛的2-氨基吡啶的有效铁催化的分子间氨基氧化。在标准条件下合成含有各种官能团的3-芳基咪唑并[1,2- a ]吡啶。该转化在简单的条件下进行,并以高收率形成产物。