A novel one‐pot [4+2]‐benzannulation approach to substituted carbazoles is accomplished by acid‐catalyzed C3‐propargylation of 2‐alkenyl/aryl indoles with 1‐aryl propargylicalcohols, followed by cycloisomerization. A variety of 2‐alkenylated indoles and 2‐aryl/heteroaryl indoles successfully participated in this tandem reaction with 1‐aryl/heteroaryl propargylicalcohols to provide diversely substituted
N-Heterocyclic Carbene-Catalyzed Annulation of Ylides with Ynals: Direct Access to α-Pyrones
作者:Ming Lang、Qianfa Jia、Jian Wang
DOI:10.1002/asia.201800595
日期:2018.9.4
We herein report an N‐HeterocyclicCarbene (NHC)‐catalyzed annulation of ylides with ynals that provides an efficient protocol to make 4,6‐disubstituted α‐pyrones. This method affords a variety of α‐pyrones in good to high yields as well as broad substrate scope and good functional group tolerance.
Lewis Acid-Catalyzed Intermolecular Annulation: Three-Component Reaction toward Imidazo[1,2-<i>a</i>]pyridine Thiones
作者:Zhengwang Chen、Pei Liang、Fan Xu、Rulin Qiu、Qi Tan、Lipeng Long、Min Ye
DOI:10.1021/acs.joc.9b01188
日期:2019.7.19
A Lewis acid-catalyzed three-component annulation reaction of 2-aminopyridines and ynals with elemental sulfur was established. A series of imidazo[1,2-a]pyridine thiones was obtained in moderate to excellent yields. The merits of this transformation include easily available starting materials, multiple C-heteroatom bond formation in one pot, good functional group tolerance, elemental sulfur as S source
建立了路易斯酸催化的2-氨基吡啶和ynals与元素硫的三组分环化反应。以中等至优异的产率获得了一系列咪唑并[1,2- a ]吡啶硫酮。这种转化的优点包括:容易获得的起始原料,在一个罐中形成多个C-杂原子键,良好的官能团耐受性,元素硫作为S源,操作简便等。
Enantioselective N-Heterocyclic Carbene-Catalyzed Kinetic Resolution of Anilides
作者:Jianbo Bie、Ming Lang、Jian Wang
DOI:10.1021/acs.orglett.8b02538
日期:2018.9.21
The N-heterocyclic carbene (NHC)-catalyzed enantioselectivekineticresolution of anilides (a kind of hemiaminals) is reported. Upon exposure to the reaction in the presence of an NHC precatalyst and base, catalytic C–O bond formation occurs, providing axially chiral isoindolinones in high yields with excellent enantioselectivities.
Metal-Free Aminothiation of Alkynes: Three-Component Tandem Annulation toward Indolizine Thiones from 2-Alkylpyridines, Ynals, and Elemental Sulfur
作者:Zhengwang Chen、Pei Liang、Fan Xu、Zhen Deng、Lipeng Long、Guotian Luo、Min Ye
DOI:10.1021/acs.joc.9b01802
日期:2019.10.4
A metal-free three-component annulation reaction for the synthesis of indolizine thiones via tandem C-C/C-N/C-S bondformation was developed. Various 2-alkylpyridines with aromatic ynals and elemental sulfur proceeded smoothly under catalyst-free conditions, and the desired products were obtained in moderate to excellent yields.