An expedient route to highly functionalized 2H-chromene-2-thiones via ring annulation of β-oxodithioesters catalyzed by InCl3 under solvent-free conditions
作者:Rajiv Kumar Verma、Girijesh K. Verma、Keshav Raghuvanshi、Maya Shankar Singh
DOI:10.1016/j.tet.2010.11.055
日期:2011.1
A convenient and one-pot synthesis of 3-aroyl/heteroaroyl-2H-chromene-2-thiones and benzo[f]2H-chromene-2-thiones has been developed by the condensation of β-oxodithioesters and salicylaldehydes/α-hydroxynaphthaldehydes in the presence of indium trichloride under solvent-free conditions. The reaction is operationally facile, readily scalable, and offers rapid entry into differentially substituted chromene-2-thione
通过β-氧代二硫代酯与水杨醛/α-的缩合反应,开发出了一种方便的一锅合成3-芳酰基/杂芳酰基-2 H-亚甲基-2-硫酮和苯并[ f ] 2 H-亚甲基-2-硫酮的方法。在无溶剂条件下在三氯化铟存在下生成羟基萘醛。该反应操作简便,易于扩展,可快速进入差异取代的亚甲基-2-硫酮骨架。
A catalyst-free route for the green and efficient synthesis of 2H-chromene-2-thiones in neutral ionic liquid
作者:Rashmi Sharma、Anil Kumar
DOI:10.1016/j.tetlet.2022.154271
日期:2023.1
Metal- and catalyst-free, environmentally benign and a facile synthetic route to 2H-chromene-2-thiones via cyclocondensation reaction of various salicylaldehydes and β-oxodithioesters by employing 1-butyl-3-methylimidazolium chloride, [Bmim]Cl as a neutral medium has been demonstrated for the first time.
Application of β-Oxodithioesters in Domino and Multicomponent Reactions: Facile Route to Dihydropyrimidines and Coumarins
作者:Okram Mukherjee Singh、Nepram Sushuma Devi
DOI:10.1021/jo802585b
日期:2009.4.17
A facile route to hitherto unknown 5-methylmercaptothio-carbonyl-4-aryl-3,4-dihydropyrimidin-2(1H)-ones and substituted 2H-chromene-2-thiones has been developed. SnCl2 catalyzed cyclocondensation of beta-oxodithioesters with a variety of readily accessible aldehydes and urea affords the dihydropyrimidinones. The methodology involves the three-component Biginelli reaction. On the other hand, substituted salicylaldehyde and beta-oxodithioesters reacted under the same condition to afford the substituted 2H-chromene-2-thiones in high yields.
Novel 3-alkanoyl/aroyl/heteroaroyl-2H-chromene-2-thiones: Synthesis and evaluation of their antioxidant activities
A facile, convenient and high yielding synthesis of a combinatorial library of 3-alkanoyl/aroyl/heteroaroyl-2H-chromene-2-thiones has been developed by the condensation of easily accessible beta-oxodithioesters and salicylaldehyde/substituted 2-hydroxybenzaldehydes under solvent-free conditions. The assessment of radical scavenging capacity of the compounds towards the stable free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) was measured and these compounds were found to scavenge DPPH free radical efficiently. Five selected compounds were able to protect curcumin from the attack of sulfur free radical generated by radiolysis of glutathione (GSH). The newly synthesized compounds exhibited profound antioxidant activities Five of them rendered comparatively high antioxidant capacity.
Devi, Nepram Sushuma; Singh, Thokchom Prasanta; Khumanthem, Nonibala, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2013, vol. 52, # 9, p. 1224 - 1231