Palladium-Catalyzed Fluorocarbonylation Using N-Formylsaccharin as CO Source: General Access to Carboxylic Acid Derivatives
摘要:
N-Formylsaccharin, an easily accessible crystalline compound, has been employed as an efficient CO source in Pd-catalyzed fluorocarbonylation of aryl halides to afford the corresponding acyl fluorides in high yields. The reactions use a near-stoichiometric amount of the CO source (1.2 equiv) and tolerate diverse functional groups. The acyl fluorides obtained could be readily transformed into various carboxylic acid derivatives such as carboxylic acid, esters, thioesters, and amides in a one-pot procedure.
Synthesis and characterization of thiophenes with fluorinated substituents
摘要:
The synthesis of several 3-(polyfluoro)thiophenes, which are possible precursors to conductive polythiophenes, is described. This report includes an improved synthesis of 3-trifluoromethylthiophene and the previously reported but uncharacterized 3-fluoroformylthiophene. The new compounds 1-(3-thienyl)-1H,2H,3H,3H-nonafluorohept-1-ene, l-(3-thienyl)-1H,2H,3H,3H-tridecafluoronon-1-ene, 1-(3-thenyl)-trifluoroacetate, 1-(3-thenyl)-heptafluorobutyrate, and 1-(3-thenyl)-3-fluorosulfuryltetrafluoroethylether are reported. The last compound is unstable and decomposes to 1-fluorosulfuryl-1-fluoroformyldifluoromethane and thenyl fluoride. More extensive data for the previously prepared 1-(3-thienyl)-1H,2H,2H,3H,3H-tridecafluoronon-1-ol and 1-(3-thienyl)-1H,2H,2H,3H,3H-nonafluoroheptan-1-ol are also included. (C) 1999 Elsevier Science S.A. All rights reserved.
Catalytic Acid Fluoride Synthesis via Carbonylation of Organic Bromides in the Presence Potassium Fluoride
作者:Tamon Okano、Nobuyuki Harada、Jitsuo Kiji
DOI:10.1246/bcsj.65.1741
日期:1992.6
Various aryl bromides were carbonylated under an atmosphericpressure of carbonmonoxide in DMF in the presence of potassium fluoride to give aroyl fluorides in excellent yields. The carbonylation was promoted by the addition of phase transfer catalysts, but the contamination with water reduced the selectivity.
Construction of C(CO)–C(CO) Bond via NHC-Catalyzed Radical Cross-Coupling Reaction
作者:Hai-Bin Yang、Xiao-Fang Jin、Hui-Ying Jiang、Wenwei Luo
DOI:10.1021/acs.orglett.3c00272
日期:2023.3.24
A C(sp2)–C(sp2) bond can be constructed via a photoredox/N-heterocyclic carbene (NHC)-cocatalyzed radical cross-couplingreaction, which provides a complementary strategy to classic electron pair processes. The present protocol represents the first example of an NHC-catalyzed two-component radical cross-couplingreaction involving C(sp2)-centered radical species. The decarboxylative acylation of oxamic