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.
Nano-TiCl<sub>4</sub>/SiO<sub>2</sub>: An Efficient and Reusable Catalyst for the Synthesis of Tetrahydrobenzo[a]xanthenes-11-ones
作者:Bi Bi Fatemeh Mirjalili、Abdolhamid Bamoniri、Leila Zamani
DOI:10.2174/157017812801264700
日期:2012.5.1
Tetrahydrobenzo[a]xanthen-11-ones have been synthesized using 50% nano-TiCl4/SiO2 as a reusable,
inexpensive, and efficient Lewis acid catalyst. Short reaction times, high yields, scale up, and easy work-up are the
advantages of this protocol.
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 /
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.