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.
Abstract A series of 1‐oxo‐1,2,3,4,9,10‐hexahydroxanthene derivatives were synthesized from substituted salicylaldehydes and substituted 1,3‐hexanedione in water at 90°C catalyzed by TEBA. The structure of the product was confirmed by X‐ray analysis. Compared with other synthetic methods, this new method has the advantages of easier workup, milder reaction conditions, high yields (85 ∼ 95%) and environmentally