Highly efficient synthesis of triazolo[1,2- a]indazole-triones and novel spiro triazolo[1,2- a]indazole-tetraones under solvent-free conditions

A new, convenient, and high yielding procedure for the synthesis of triazolo[1,2- a]indazole-triones by the condensation reaction between dimedone, aryl aldehydes, and ueazoles in the presence of a catalytic amount of sulfonated polyethylene glycol (PEG-SO 3H) as a highly stable and reusable eco-fri...

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Bibliographic Details
Published in:Tetrahedron 2011-01, Vol.67 (2), p.390-400
Main Authors: Hasaninejad, Alireza, Zare, Abdolkarim, Shekouhy, Mohsen
Format: Article
Language:English
Subjects:
aldehydes
chemical reactions
Chemistry
Combinatorial chemistry
condensation
Exact sciences and technology
Heterocyclic compounds
Heterocyclic compounds with several n hetero atoms in the same ring, in separated rings or in fused rings
Multi-component reaction
Organic chemistry
PEG-SO 3H
polyethylene glycol
Preparations and properties
Spiro triazolo[1,2- a]indazole-tetraone
synthesis
Triazolo[1,2- a]indazole-triones
Urazole
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Summary:A new, convenient, and high yielding procedure for the synthesis of triazolo[1,2- a]indazole-triones by the condensation reaction between dimedone, aryl aldehydes, and ueazoles in the presence of a catalytic amount of sulfonated polyethylene glycol (PEG-SO 3H) as a highly stable and reusable eco-friendly degradable polymeric catalyst is described under solvent-free conditions. This procedure has also been applied successfully for the synthesis of novel spiro triazolo[1,2- a]indazole-tetraones. [Display omitted]
ISSN:0040-4020
1464-5416
DOI:10.1016/j.tet.2010.11.029