Phosphinite ionic liquid (IL-OPPh2) as a recyclable reagent for the efficient synthesis of coumarins under microwave irradiation conditions
作者:H. Valizadeh、H. Gholipour、M. Mahmoudian
DOI:10.1007/bf03245917
日期:2011.9
the efficient synthesis of 4-substituted coumarins via the reaction of di(methyl or ethyl) acetylenedicarboxylate with phenolic compounds under microwave irradiation conditions. The effects of parameters such as the amount of the phosphinite ionic liquid, reaction temperature and reaction time on this procedure were investigated. Products were obtained in good yields using this mild and one-pot methodology
intermediates, produced in the reactionbetweentriphenylphosphine and dialkyl acetylenedicarboxylates, by phenols (1-hydroxynaphthalene, 2-hydroxynaphthalene, 4-bromophenol, 2-hydroxybenzaldehyde, and 5-bromo-2-hydroxyben- zaldehyde) leads to vinyltriphenylphosphonium salts, which undergo electrophilic substitutionreaction with conjugate base to produce corresponding stabilized phosphorus ylides. Microwave was
Abstract A convenient one-potsynthesis of coumarin derivatives from the three-component reaction of triphenylphosphine, an acetylenicester, and a phenol (1-naphthol, 2-naphthol and benzo[1,3]dioxol-5-ol) in the presence of a catalytic amount (4.5 mol%) of ß-cyclodextrin as a nanocatalyst and nanoreactor is reported. This methodology is of interest due to the use of water in the presence of this “ß-cyclodextrin
MICROWAVE INDUCED SYNTHESIS OF COUMARINS FROM IN SITU GENERATED STABILIZED PHOSPHORUS YLIDES IN THE PRESENCE OF SILICA GEL POWDER IN SOLVENT-FREE CONDITIONS
作者:Ali Ramazani、Ali Souldozi
DOI:10.1080/10426500490422173
日期:2004.3.1
the reactionbetweentriphenylphosphine and dialkyl acetylenedicarboxylates, by phenols (1-hydroxynaphthalene, 2-hydroxynaphthalene and 4-bromophenol) leads to vinyltriphenylphosphonium salts, which undergo aromatic electrophilic substitutionreaction with conjugate base to produce corresponding stabilized phosphorus ylides. Microwave was found to catalyze conversion of the stabilized phosphorus ylides