A mild, simple and convenient procedure for the synthesis of spiro-oxindole heterocycles containing fused 4H-pyran ring and also bis-2-amino-4H-pyrans derivatives was described using C4(DABCO-SO3H)2·4Cl as a nano, efficient, cheap, and reusable catalyst under mild and homogeneous conditions.
Tris-hydroxymethylaminomethane (THAM): An efficient organocatalyst in diversity-oriented and environmentally benign synthesis of spirochromenes
作者:Supriya S. Khot、Prashant V. Anbhule、Uday V. Desai、Prakash P. Wadgaonkar
DOI:10.1016/j.crci.2018.05.005
日期:2018.9
Résumé Tris-hydroxymethylaminomethane has been demonstrated to be an efficient organocatalyst in diversity-oriented synthesis of medicinally prevalent spirochromenes by one-pot, three-component reactions between isatins, malononitrile, and enolizable CH acids like dimedone, 4-hydroxycoumarin, 4-hydroxy-N-methylquinolin-2-one, or in situ generated 2-methylpyrazolon-2-one. Biodegradability and extremely low cost of the catalyst are the noteworthy features of this chromatography-free protocol. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.pdf
Click approach to the novel 1,2,3-triazolium phosphotungstate organic–inorganic hybrids for the highly promoted synthesis of spirooxindoles
作者:Layla A. Taib、Mosadegh Keshavarz、Abolfath Parhami
DOI:10.1007/s11164-021-04632-2
日期:2022.2
SO3H-functionalized ionic hybrid catalysts have a cationic organic triazolium with phosphotungstate anion and are water-soluble with appropriate thermal stability. Their catalytic activity was explored for the synthesis of spirooxindoles via the three‐component reaction of 1,3‐dicarbonyl compounds, barbituric acid, and isatin derivatives. The synthesis of desired spirooxindole products was performed in acceptable
α-Amylase from hog pancreas displayed catalytic promiscuity in three-component reaction for the synthesis of 3,3′-disubstituted oxindoles and spirooxindole pyrans.
Abstract In this research the synthesis of 1,1′-(butane-1,4-diyl)bis(1,4-diazabicyclo[2.2.2]octan-1-ium) hydroxide as an effective basicionicliquid containing dual basic functional groups is reported. After characterization using FT-IR, 1H NMR, 13C NMR and mass analyses, this reagent is efficiently used for promotion of the synthesis of spiro-4H-pyrans via one-pot three-component condensation through a