Use of Microwave Irradiation and Solid Acid Catalysts in an Enhanced and Environmentally Friendly Synthesis of Coumarin Derivatives
作者:Antonio de la Hoz、Andrés Moreno、Ester Vázquez
DOI:10.1055/s-1999-2674
日期:1999.5
Condensation of phenol, 1,3-dihydroxybenzene and 1,3,5-trihydroxybenzene with propynoic and propenoic acids and ethyl acetoacetate using solid acid catalysts and microwave irradiation produces coumarins in excellent yields. The use of hterogeneous catalystas eliminates the production of acidic waste streams associated with conventional (Lewis) acid catalysts. This quick, efficient and environmentally friendly procedure permits the synthesis of substituted coumarins as well as coumarins without 4-alkyl substituents, which are the most difficult to synthesize.
Synthesis of 7-hydroxycoumarins catalysed by solid acid catalysts
作者:Anthonius J. Hoefnagel、Eric A. Gunnewegh、Roger S. Downing、Herman van Bekkum
DOI:10.1039/c39950000225
日期:——
Syntheses of substituted 7-hydroxycoumarins via reactions of 1,3-dihydroxybenzene with ethyl acetoacetate (Pechmann reaction) and with propenoic acid and propynoic acids are reported, in which the production of environmentally harmful waste streams is minimized by the use of solid acid catalysts.
Synthesis of 7-hydroxycoumarins by Pechmann reaction using Nafion resin/silica nanocomposites as catalysts
作者:M Laufer
DOI:10.1016/s0021-9517(03)00073-3
日期:2003.9.10
of resorcinol with ethyl acetoacetate (Pechmann reaction) or with acrylic acid over novel Nafion resin/silicacomposite materials with 40 and 80 wt% of Nafion in silica produces 7-hydroxycoumarins in high yields, under mild reaction conditions in short reaction time. Other solid acid catalysts were tested for comparison reasons.
Gunnewegh; Hoefnagel; Downing, Recueil des Travaux Chimiques des Pays-Bas, 1996, vol. 115, # 4, p. 226 - 230
作者:Gunnewegh、Hoefnagel、Downing、Van Bekkum
DOI:——
日期:——
[DE] VERFAHREN ZUR SYNTHESE VON CUMARIN UND SEINEN DERIVATEN<br/>[EN] METHOD FOR SYNTHESIZING COUMARIN AND THE DERIVATIVES THEREOF<br/>[FR] PROCEDE DE SYNTHESE DE CUMARINE ET DE SES DERIVES