Organocatalytic Syntheses of Benzoxazoles and Benzothiazoles using Aryl Iodide and Oxone via C–H Functionalization and C–O/S Bond Formation
摘要:
An organocatalytic protocol for the syntheses of 2-substituted benzoxazoles and benzothiazoles is described from alkyl-/arylanilides and alkyl-/arylthioanilides using 1-iodo-4-nitrobenzene as catalyst and oxone as an inexpensive and environmentally safe terminal oxidant at room temperature in air via oxidative C-H functionalization and C-O/S bond formation. The procedure is simple and general and provides an effective route for the construction of functionalized 2-alkyl-/arylbenzoxazoles and 2-alkyl-/arylbenzothiazoles with moderate to high yields. The synthetic and mechanistic aspects have been described.
isoindolinones including indoprofen and DWP205190 drugs from 2-alkylbenzamide substrates by transition metal-free intramolecular selective oxidativecoupling of C(sp(3))-H and N-H bonds utilizing iodine, potassium carbonate and di-tert-butyl peroxide in acetonitrile at 110-140 degrees C.
Mechanochemical Transformation of CF
<sub>3</sub>
Group: Synthesis of Amides and Schiff Bases
作者:Satenik Mkrtchyan、Michał Jakubczyk、Suneel Lanka、Muhammad Yar、Khurshid Ayub、Mohanad Shkoor、Michael Pittelkow、Viktor O. Iaroshenko
DOI:10.1002/adsc.202100538
日期:2021.12.21
transformations of CF3 group with nitro compounds into amides or Schiff bases employing Ytterbia as a catalyst. This process proceeds via C−F bond activation, accompanied with utilisation of Si-based reductants/oxygen scavengers – reductants of the nitro group. The scope and limitations of the disclosed methodologies are thoroughly studied. To the best of our knowledge, this work is the first example of
Direct Amidation of Carboxylic Acids with Nitroarenes
作者:Shao-Peng Wang、Chi Wai Cheung、Jun-An Ma
DOI:10.1021/acs.joc.9b02068
日期:2019.11.1
N-Aryl amides are an important class of compounds in pharmaceutical and agrochemical chemistry. Rapid and low-cost synthesis of N-aryl amides remains in high demand. Herein, we disclose an operationally simple process to access N-aryl amides directly from readily available nitroarenes and carboxylicacids as coupling substrates. This method involves the in situ activation of carboxylicacids to acyloxyphosphonium
Cu-Catalyzed Arylation of Bromo-Difluoro-Acetamides by Aryl Boronic Acids, Aryl Trialkoxysilanes and Dimethyl-Aryl-Sulfonium Salts: New Entries to Aromatic Amides
作者:Satenik Mkrtchyan、Michał Jakubczyk、Suneel Lanka、Michael Pittelkow、Viktor O. Iaroshenko
DOI:10.3390/molecules26102957
日期:——
copper-catalyzed directarylation. Readily available and structurally simple aryl precursors such as arylboronicacids, aryl trialkoxysilanes and dimethyl-aryl-sulfonium salts were used as the source for the aryl substituents. The scope of the reactions was tested, and the reactions were insensitive to the electronic nature of the aryl groups, as both electron-rich and electron-deficient aryls were successfully
Highly efficient synthesis of fused bicyclic 2,3-diaryl-pyrimidin-4(3H)-ones via Lewis acid assisted cyclization reaction
作者:Kunyong Yang、Xiaohui He、Ha-soon Choi、Zhicheng Wang、David H. Woodmansee、Hong Liu
DOI:10.1016/j.tetlet.2008.01.071
日期:2008.3
An expedient one-potsynthesis of fused bicyclic 2,3-diaryl-pyrimidin-4(3H)-onesfrom three readily available components is described. The key step is a Lewis acid assisted cyclization reaction.