iron oxide (up to 32.8 %) with average diameter of 30–40 nm on the surface of NaYzeolite. The catalytic activity of nano Fe/NaYzeolite was examined in the preparation of 1-oxo-hexahydroxanthene and tetraketone derivatives. The results showed its applicability as a green, reusable, and promising catalyst for organic synthesis. This protocol demonstrates several notable advantages including short reaction
2,4,6-Trichloro-1,3,5-triazine as an Efficient Catalyst for Synthesis of Benzopyran Derivatives under Solvent-Free Conditions
作者:Peng Zhang、Yong-Dong Yu、Zhan-Hui Zhang
DOI:10.1080/00397910802369604
日期:2008.11.13
Abstract An efficient and convenient procedure has been developed for the synthesis of benzopyran derivatives by one-pot condensation of substituted salicyaldehydes and substituted 1,3-hexanediones in the presence of a catalytic amount of 2,4,6-trichloro-1,3,5-triazine (TCT, cyanuric chloride) undersolvent-freeconditions.
Synthesis of xanthene and coumarin derivatives in water by using β-Cyclodextrin
作者:Siddharth R. Kamat、Ananda H. Mane、Audumbar D. Patil、Trushant R. Lohar、Rajashri S. Salunkhe
DOI:10.1007/s11164-020-04308-3
日期:2021.3
Simple and green procedure was developed for the synthesis of various xanthene and coumarin derivativesusing beta-cyclodextrin (β-CD) as reusable catalyst at 70 °C in water. Condensation of salicylaldehyde (1 mmol) and dimedone (2 mmol) or 1,3 cyclohexadione (2 mmol) gave corresponding xanthene derivatives, while condensation of salicylaldehyde (1 mmol) with Meldrum’s acid (1 mmol) or 4-Hydroxy-6
FeCl 3 ·6H 2 O as a green and readily available catalyst for the synthesis of 1-oxo-hexahydroxanthenes by the condensation of salicylaldehydes with 1,3-diketones in aqueous media
作者:Mahmood Tajbakhsh、Marzieh Heidary、Rahman Hosseinzadeh、Mohammadreza Azizi Amiri
DOI:10.1016/j.tetlet.2015.11.088
日期:2016.1
A facile and efficient method for the synthesis of 1-oxo-hexahydroxanthenes catalyzed by FeCl3·6H2O is described. The iron-catalyzed condensation of salicylaldehydes with cyclic 1,3-diketones afforded 1-oxo-hexahydroxanthene derivatives in a good to excellent yield at room temperature. The use of water as a green solvent, purification of the products by non-chromatographic methods, catalyst reusability
Abstract A series of 1-oxo-hexahydroxanthene derivatives was synthesized at room temperature in solid state from substituted salicylaldehydes and substituted 1,3-hexanediones in the presence of a catalytic amount of cellulose sulfuricacid. The results showed that the reaction performed under solid-state conditions was benign to the environment, with higher yields and more convenient workup.