C3-Arylation of indoles with aryl ketones <i>via</i> C–C/C–H activations
作者:Zi-Qiong Guo、Hui Xu、Xing Wang、Zhen-Yu Wang、Biao Ma、Hui-Xiong Dai
DOI:10.1039/d1cc03954g
日期:——
C3-Arylation of indoles with aryl ketones is accomplished via palladium-catalyzed ligand-promoted Ar–C(O) cleavage and subsequent C–H arylation of indole. Various (hetero)aryl ketones are compatible in this reaction, affording the corresponding 3-arylindoles in moderate to good yields. Further introduction of an indole moiety into the natural products desoxyestrone and evodiamine demonstrate the synthetic
Palladium-catalyzed C-H formylation of electron-rich heteroarenes through radical dichloromethylation
作者:Yan Bao、Jian-Yong Wang、Ya-Xuan Zhang、Yan Li、Xi-Sheng Wang
DOI:10.1016/j.tetlet.2018.07.013
日期:2018.8
A novel palladium-catalyzed C-H formylation of electron-rich N-, O-, and S-containing heteroarenes has been developed. The key to success is that the commercially available BrCHCl2 was used as a stoichiometric carbonyl source. Mechanistic investigations indicated that different from the known Reimer-Tiemann reaction, this net C-H formylation proceeded through an electrophilc radical-type path.
Intermolecular dearomative oxidative coupling of indoles with ketones and sulfonylhydrazines catalyzed by I2: synthesis of [2,3]-fused indoline tetrahydropyridazines
作者:Feng Wei、Liang Cheng、Hongyan Huang、Jiejie Liu、Dong Wang、Li Liu
DOI:10.1007/s11426-016-0170-8
日期:2016.10
A convergent construction of [2,3]-fused indoline tetrahydropyridazines via an I2/tert-butyl hydroperoxide (TBHP) catalyzed three-component dearomative oxidative coupling of indoles, hydrazines and acetophenone was established in moderate to good yields. This protocol provides a new approach for the synthesis of these biologically interesting fused indolines.
constructed from indoles and cyclohexanone derivatives using a combination of catalytic niobic acid-on-carbon (Nb2O5/C) and palladium-on-carbon (Pd/C) under heating conditions without any oxidants. The Lewis acidic Nb2O5/C promoted the nucleophilic addition of indoles to the cyclohexanones, and the subsequent dehydration and Pd/C-catalyzed dehydrogenation produced the 3-arylindoles. The additive 2
Catalytic Au(<scp>i</scp>)/Au(<scp>iii</scp>) arylation with the hemilabile MeDalphos ligand: unusual selectivity for electron-rich iodoarenes and efficient application to indoles
electron-deprived substrates typically encountered with palladium. Based on DFT calculations and detailed analysis of the key transition states (using NBO, CDA and ETS-NOCV methods in particular), the different behavior of the two metals is proposed to result from inverse electron flow between the substrate and metal. Indeed, oxidative addition of iodobenzene is associated with a chargetransfer from the substrate