We developed efficient aerobic photooxidative oxylactonizations of oxocarboxylic acids promoted by trifluoroacetic anhydride with molecular oxygen as the terminal oxidant in the fluorous solvent FC-72.
Hypervalent Iodine(III) Sulfonate Mediated Synthesis of 5-Benzoyldihydro-2(3H)-furanone in Ionic Solvent
作者:Ling-Ching Chen、Rei-Sheu Hou、Huey-Min Wang、Yu-Chien Lin
DOI:10.3987/com-04-10301
日期:——
The room temperature ionic liquid, n-butylpyridinium tetrafluoroborate (BPyBF 4 ) is used as a "green" recyclable solvent for the reaction of 4-benzoylbutyric acid with [hydroxy-(2,4-dinitrobenzenesulfonyloxy)iodo]-benzene(HDNIB) to prepare 5-benzoyldihydro-2(3H)-furanone.
A direct and efficient method for the preparation of 5-benzoyldihydro-2(3H)-furanones was realized by cyclization of 4-benzoylbutyric acids in the presence of phenyliodine(III) triflate.
A novel approach for the synthesis of β-keto esters: one-pot reaction of carboxylic acids with chlorosulfonyl isocyanate
作者:Ufuk Atmaca
DOI:10.24820/ark.5550190.p011.209
日期:——
esters were synthesized by direct carboxylation of various 4and 5-oxo-carboxylic acid derivatives in the presence of chlorosulfonyl isocyanate in excellent yield under mild conditions. Additionally, optimization conditions were examined for synthesis β-keto esters. Finally, it has been found that trifluoroacetic acid is efficient in DCM under optimized conditions. This efficient one-pot novel method
We developed aerobic photooxidative oxylactonization of oxocarboxylic acids catalyzed by calcium iodide using molecular oxygen as the terminal oxidant under photo irradiation. (C) 2012 Elsevier Ltd. All rights reserved.