Palladium-Catalyzed Ligand-Free Double Cyclization Reactions for the Synthesis of 3-(1′-Indolyl)-phthalides
作者:Shuo Yuan、Dan-Qing Zhang、Jing-Ya Zhang、Bin Yu、Hong-Min Liu
DOI:10.1021/acs.orglett.9b04241
日期:2020.2.7
heterocyclic scaffolds in numerous natural products and bioactive molecules. The synthesis and biological evaluation of the compounds combining these two scaffolds have rarely been reported. Herein, we repot the first palladium-catalyzed ligand-free double cyclization reactions that enable efficient synthesis of 3-(1'-indolyl)-phthalides (42 examples, up to 96% yield) under mild conditions. Notably
One‐Pot Copper‐Catalyzed Cascade Bicyclization Strategy for Synthesis of 2‐(1
<i>H</i>
‐Indol‐1‐yl)‐4,5‐dihydrothiazoles and 2‐(1
<i>H</i>
‐Indol‐1‐yl)thiazol‐5‐yl Aryl Ketones with Molecular Oxygen as an Oxygen Source
作者:Jialin Xie、Zhonglin Guo、Yuanqiong Huang、Yi Qu、Hongjian Song、Haibin Song、Yuxiu Liu、Qingmin Wang
DOI:10.1002/adsc.201801193
日期:2019.2
atom‐economical method for synthesizing N‐heterocyclic indolesfrom readily available o‐alkynylphenyl isothiocyanates and propargylamine derivatives is reported. This method involves a copper‐catalyzed cascade bicyclization process consisting of an intramolecular 5‐exo‐dig hydrothiolation reaction and an intramolecular hydroamination reaction and, depending on whether or not molecular oxygen is present
kinetic resolution of 2-substituted indoline derivatives was achieved by hydrogentransfer to imines by means of a chiral phosphoric acid catalyst. The oxidative kinetic resolution was applicable to racemic alkyl- or aryl-substituted indolines, and the remaining indolines were obtained in good yields with excellent enantioselectivities.
Palladium-catalyzed multicomponent reactions (MCRs) between o-alkynylanlines, aryl iodides, and atmospheric pressure of CO2 are developed, affording a series of 3,3-diaryl 2,4-quinolinediones bearing a newly constructed quaternary carbon center in moderate to excellent yields. The reaction proceeded with a sequential carboxylation, trans-oxopalladation of C≡C bond by ArPdX species, and reductive elimination