Palladium-Catalyzed Alkoxycarbonylation of Arylsulfoniums
摘要:
Alkoxycarbonylation of arylsulfoniums has been developed with the aid of a catalytic amount of a palladium-Xantphos complex under an atmospheric pressure of CO gas. Various functional groups such as carbonyl, cyano, halo, and sulfonyl groups were well tolerated under the present catalysis. Since aryldimethylsulfoniums were readily prepared from the corresponding aryl methyl sulfides and methyl triflate, one-pot alkoxycarbonylation of aryl methyl sulfides could be accomplished.
Facile oxidative conversion of alcohols to esters using molecular iodine
作者:Naoshi Mori、Hideo Togo
DOI:10.1016/j.tet.2005.03.097
日期:2005.6
A simple, efficient, and high-yield procedure for the oxidative conversion of alcohols to various types of esters and ketones, with molecular iodine and potassium carbonate was successfully carried out.
Facile Conversion of Alcohols to the Corresponding 2,2,2-Trifluoroethyl Esters with Molecular Iodine and Potassium Carbonate in 2,2,2-Trifluoroethanol
作者:Hideo Togo、Naoshi Mori
DOI:10.1055/s-2004-817789
日期:——
A simple, effective, and high-yield procedure for the oxidative conversion of primary alcohols to the corresponding 2,2,2-trifluoroethyl esters, with molecular iodine and potassium carbonate in 2,2,2-trifluoroethanol, was studied.
Carbonylation reactions represent useful tools for organic synthesis. However, the necessity to use gaseous carbon monoxide is a disadvantage for most organic chemists. To solve this problem, novel protocols have been developed for conducting palladium‐catalyzed reductive carbonylations of arylbromides and alkoxycarbonylations using paraformaldehyde as an external CO source (CO gas free). Hence, aromatic
Concurrent pathways to explain solvent and substituent effects for solvolyses of benzoyl chlorides in ethanol-trifluoroethanol mixtures
作者:T. William Bentley、In Sun Koo
DOI:10.3998/ark.5550190.0013.703
日期:——
Rate constants are reported at 25 oC for solvolyses of p-Z-substituted benzoylchlorides (Z = O2N, Cl, H, Me, and MeO) in 2,2,2-trifluoroethanol (TFE) in binary mixtures with water or ethanol. Product selectivities (kTFE/kwater) are also reported. Previous work in which rate constants for solvolyses of benzoylchlorides are correlated with σ constants is re-evaluated. V-shaped plots (assuming concurrent
The directesterification of carboxylic acids with perfluorinated alcohols mediated by XtalFluor-E is reported. The corresponding polyfluorinated esters are obtained in moderate to excellent yields with a broad range of carboxylic acids, including aromatic, heteroaromatic, aliphatic, and nonracemic chiral substrates, using only a slight excess (2 equiv) of the perfluorinated alcohol. Control experiments