Efficient Synthesis of Functionalized Dihydro-1<i>H</i>-indol-4(5<i>H</i>)-ones via One-Pot Three-Component Reaction under Catalyst-Free Conditions
作者:Hui-Yan Wang、Da-Qing Shi
DOI:10.1021/co4000198
日期:2013.5.13
A facile and efficient one-pot procedure for the preparation of functionalized dihydro-1H-indol-4(5H)-ones by a catalyst-free, three-component reaction of 1,3-dicarbonyl compounds, arylglyoxal monohydrate and enaminones under mild conditions in excellent yield is reported. This synthesis was confirmed to follow the group-assisted-purification (GAP) chemistry process, which can avoid traditional purifications
Solid-State Synthesis of β-Enamino
Ketones from Solid 1,3-Dicarbonyl Compounds and Ammonium
Salts or Amines
作者:Jing-Hua Li、Shi-Liang Xu、Cheng-Ping Li
DOI:10.1055/s-0028-1087914
日期:——
A facile amination of solid 1,3-dicarbonyl compounds with ammonium salts or amines in solid state has been achieved by mechanochemical grinding in the presence of KHSO4 and SiO2. Most of the reactions proceed smoothly at room temperature under solid-state conditions and give their corresponding β-imino derivatives in high yields. The method has the advantage of simple manipulation and mild conditions.
A variety of functionalized N-alkylated carbazolones were prepared via N-alkylation of 3-(arylamino)cyclohex-2-enones followed by an intramolecular oxidative coupling mediated by Pd(OAc)2 under an oxygen atmosphere. This approach adopts an inverted sequence, consisting of the conventional annulation and subsequent N-alkylation.
NMR of Enaminones Part 3—1H,13C and17O NMR Spectroscopic Studies of Acyclic and CyclicN-Aryl Enaminones: Substituent Effects and Intramolecular Hydrogen Bonding
17O, 13C and 1H NMR spectra for para‐ and meta‐substituted 4‐arylaminopent‐3‐en‐2‐ones (acyclic enaminones, 1 and 2) and 3‐arylaminocyclohex‐2‐en‐1‐ones (cyclic enaminones, 3 and 4) are reported. The 17O, 13C and 1H shift values of these enaminones correlate well with σm0 and σp‐ constants in the correlations for meta and para derivatives, and with pKa values of the corresponding anilines. Dual substituent
Mild and Efficient Method for Synthesis of Eaminones Using Ytterbium Triflate as Catalyst
作者:Rener Chen、Ping Li、Jianjun Li、Weike Su
DOI:10.1080/00397911.2010.493722
日期:2010.8.5
A mild and efficient procedure for synthesis of β-enaminones by the condensation of β-dicarbonyl compounds and amines using ytterbium triflate [Yb(OTf)3] as catalyst is described. The catalyst can be easily recovered and reused without loss of activity.