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Tris-hydroxymethylaminomethane (THAM): An efficient organocatalyst in diversity-oriented and environmentally benign synthesis of spirochromenes
Authors:Supriya S Khot  Prashant V Anbhule  Uday V Desai  Prakash P Wadgaonkar
Institution:1. Department of Chemistry, Shivaji University, Kolhapur 416004, India;2. Polymer Science and Engineering Division, CSIR, National Chemical Laboratory, Pune 411008, India
Abstract: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 C/>H acids like dimedone, 4-hydroxycoumarin, 4-hydroxy-<em>N</em>-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.</td>
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Keywords:Multicomponent synthesis  Tris-hydroxymethylaminomethane  Organocatalysis  Spirochromenes  Green chemistry
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