l-Proline-accelerated, eco-friendly synthesis of 9-substituted-2,3,4,9-tetrahydro-1H-xanthen-1-ones under mild conditions
作者:Davinder Prasad、Amreeta Preetam、Mahendra Nath
DOI:10.1016/j.crci.2013.05.011
日期:2013.12
Résumé An efficient l-proline-accelerated synthesis of 9-substituted-2,3,4,9-tetrahydro-1H-xanthen-1-one derivatives has been accomplished via one-pot condensation of dimedone or 1,3-cyclohexanedione with substituted salicylaldehydes under mild reaction conditions. This protocol demonstrates several notable advantages, including operational simplicity, short reaction times, environmentally friendly conditions, no necessity of extraction and chromatographic purification steps, and high yields of the target products. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.doc
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
Bronsted acid-type biosurfactant for heterocyclization: a green protocol for benzopyran synthesis
作者:Smita T. Morbale、Swati D. Jadhav、Madhukar B. Deshmukh、Suresh S. Patil
DOI:10.1039/c5ra13652k
日期:——
Synthesis of benzopyran from the various salicylaldehydes and cyclic 1,3-diketones using catalytic amount of lemon extract as a green biosurfactant.
使用柠檬提取物作为绿色生物表面活性剂,从各种水杨醛和环状1,3-二酮合成苯并吡喃。
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