Solid acid TS-1 catalyst: an efficient catalyst in Knoevenagel condensation for the synthesis of 5-arylidene-2,4-thiazolidinediones/Rhodanines in aqueous medium
作者:Sachin P. Gadekar、Sudarshan S. Dipake、Suresh T. Gaikwad、Machhindra K. Lande
DOI:10.1007/s11164-018-3570-2
日期:2018.12
catalytic activity of the catalyst was tested for Knoevenagelcondensation reaction. The condensation of active ethylene 2,4-thiazolidinedione with substituted aryl aldehydes under aqueous medium at 90 °C afforded the corresponding product in excellent yield up to 92% within 30 min. The present method offers several advantages over the reported methods such as easy separation of catalyst, simple work-up procedure
mercaptoacetic acid followed by acid-catalyzed cyclization, and by the reaction of ammonia or primary amines with carbon disulfide and chloroacetic acid in the presence of bases. The condensation of aromatic aldehydes or ketones at the nucleophilic C-5 active methylene of rhodanines has been performed using tetra(n-butyl)ammonium hydroxide, under microwave in the presence of tetra(n-butyl)ammoniumbromide, 1-
Green synthesis of 5-benzylidene rhodanine derivatives catalyzed by 1-butyl-3-methyl imidazolium hydroxide in water
作者:Kai Gong、Zhi-Wei He、Ying Xu、Dong Fang、Zu-liang Liu
DOI:10.1007/s00706-008-0871-y
日期:2008.8
A basic functionalized ionic liquid, 1-butyl-3-methylimidazolium hydroxide ([ bmim ][OH]), catalyzed the Knoevenagel condensation of rhodanine with aromatic aldehydes. It proceeded smoothly in water to afford the 5-benzylidene rhodamine derivatives in high yields at room temperature. This new method offers several advantages, such as excellent yields, short reaction times, and simple procedure. The
Abstract A series of 5‐benzylidenerhodamine derivatives were synthesized by the cross‐aldol condensation of an aromatic aldehyde with rhodamine or rhodamine acetic acid in sodium acetate/acetic acid undermicrowaveirradiation. The reaction was completed in 8–20 min with 63–94% yields and was environmentally benign with easy workup.
Design and microwave facilitated green synthesis of 2-[4-(3-carboxymethyl, methoxy carbonylmethyl-2,4-dioxo and 4-oxo-2-thioxo-thiazolidin-5-ylidenemethyl)-phenoxy]-2 and 3-methyl propionic acid ethyl ester derivatives: a novel structural class of antidyslipidemic agents
作者:Ashok Kumar Singh、Avinash C. Tripathi、Aseem Tewari、Viney Chawla、Shailendra K. Saraf
DOI:10.1007/s00044-017-1875-0
日期:2017.7
decreasing the atherogenic index. Overall, these effects of BRF4 and BRF6 were found to be more potent than fenofibrate, in lipid lowering activity and reducing atherogenic index. Structure–activity relationship studies conclusively established that the presence of N-acetic acid methyl ester at 3rd position of the thiazolidin-4-one nucleus, and a C-3 fibric acid moiety at benzene nucleus were instrumental