Diammonium Hydrogen Phosphate as a Neutral and Efficient Catalyst for Synthesis of 1,8‐Dioxo‐octahydroxanthene Derivatives in Aqueous Media
摘要:
A new and efficient method to synthesize a 3,3,6,6,9-aryl-l,8-dioxo-octa-hydroxanthene derivative using diammonium hydrogen phosphate as catalyst was performed in water at room temperature in a short periods.
Envirocat EPZ-10: A Solid Acid Catalyst for the Synthesis of 1,8-Dioxo-octahydroxanthenes in Aqueous Medium
作者:D. M. Pore、T. S. Shaikh、N. G. Patil、S. B. Dongare、U. V. Desai
DOI:10.1080/00397910903221027
日期:2010.7.12
An efficient method for synthesis of 1,8-dioxo-octahydroxanthenes using EPZ-10 as a heterogeneous catalyst is developed. In this method, aldehydes and dimedone / cyclohexane-1,3-dione are heated at 70 °C in the presence of a catalytic amount of EPZ-10 in water as a universal solvent, affording the corresponding 1,8-dioxo-octahydroxanthenes in moderate to excellent yields. Also, domino Knoevenagel /
An efficient method for Knoevenagel condensation of arenecarbaldehydes with active methylene compounds such as barbituric acid and Meldrum's acid in the presence of gel‐entrapped base catalysts is reported. The method has been extended to the one‐pot synthesis of arylmethylene‐bis[3‐hydroxycyclohex‐2‐en‐1‐one] derivatives from dimedone (=5,5‐dimethylcyclohexane‐1,3‐dione) and arenecarbaldehydes by
Synthesis of a novel tetracationic acidic organic salt based on DABCO and its applications as catalyst in the Knoevenagel condensation reactions in water
Abstract Synthesis of a novel tetracationic acidic organic salt based on DABCO containing two sulfonic acid groups in the skeleton and four hydrogensulfate groups as counterion is described. Its catalytic efficiency in the Knoevenagel condensation of aldehydes with active cyclic methylene compounds in water is investigated. While 2,2'-(phenylmethylene)bis(3-hydroxy-5,5-dimethylcyclohex-2-enone) derivatives
A new and efficient method to synthesize a 3,3,6,6,9-aryl-l,8-dioxo-octa-hydroxanthene derivative using diammonium hydrogen phosphate as catalyst was performed in water at room temperature in a short periods.