CHLOROSULFONATION OF 9-ARYLOCTAHYDROXANTHEN-1,8-DIONES
摘要:
The 9-aryloctathydroxanthen-1,8-diones (3, 4-24) were prepared by reaction of cyclohexan-1,3-dione (1) with selected arylaldehydes. The xanthendiones (4-9, 11, 12, 18, 21, 22) were successfully reacted with chlorosulfonic acid, and the crude sulfonyl chlorides were converted into 15 sulfonamides (26-40) for screening as potential pesticides. Attempted chlorosulfonation of the xanthendiones (13-17) was unsuccessful. alpha-Methylcinnamaldehyde was reacted with cyclohexandione (1) to yield the corresponding xanthendione derivative (23). On the other hand, with o-methoxycinnamaldehyde an impure product formed and the p-methoxy isomer afforded the corresponding 2-arylpyran (25). The NMR spectral data of the compounds are briefly discussed.
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 /
Glycerol as a promoting medium for electrophilic activation of aldehydes: catalyst-free synthesis of di(indolyl)methanes, xanthene-1,8(2H)-diones and 1-oxo-hexahydroxanthenes
作者:Fei He、Peng Li、Yanlong Gu、Guangxing Li
DOI:10.1039/b916015a
日期:——
Glycerol was used, for the first time, as a green and effective promoting medium for electrophilic activation of aldehydes, and with which, a catalyst-free system for some reactions that conventionally carried out using acid catalysts, such as synthesis of di(indolyl)methanes, 3,4,5,6,7,9-hexahydro-9-aryl-1H-xanthene-1,8(2H)-dione and 1-oxo-hexahydroxanthenes, was developed.
β-Cyclodextrin was functionalized with butyl sulfonic acid to give an efficient, eco-friendly catalyst for the synthesis of 1,8-dioxo-octahydroxanthenes via the one-pot condensation of aromatic aldehydes and active methylene carbonyl compounds in aqueousmedia. This new methodology offers several advantages such as excellent yields, short reaction time, a simple procedure and mild reaction conditions
Facile and efficient synthesis of xanthenedione derivatives promoted by niobium pentachloride
作者:Willian H. dos Santos、Luiz C. Da Silva-Filho
DOI:10.1515/chempap-2016-0098
日期:2016.1.1
Xanthenedionederivatives were synthesised in one-pot reactions between arylaldehyde derivatives and 1,3-cyclohexanedione promoted by niobium pentachloride. This new method is simple, costeffective, high-yielding with a good variety of substrates generality, and can be conducted within reasonable reaction times.
Alumina-sulfuric acid catalyzed eco-friendly synthesis of xanthenediones
作者:Amit Pramanik、Sanjay Bhar
DOI:10.1016/j.catcom.2011.12.036
日期:2012.4
Alumina-sulfuric acid has been developed as a cost-effective, recyclable, heterogeneous solid acid catalyst for the eco-friendly synthesis of 9-aryl-1,8-dioxododecahydroxanthenes and 9-aryl-3,3,6,6-tetramethyl-1,8-dioxooctahydroxanthenes through the condensation of cyclic 1,3-diketones with different aryl and heteroaryl aldehydes. (C) 2012 Elsevier BM. All rights reserved.