Journal
TETRAHEDRON
Volume 68, Issue 29, Pages 5730-5737Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2012.05.044
Keywords
Guanylation; Amines; Carbodiimides; Nanocrystalline zinc oxide; Heterogeneous catalysis
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Funding
- CSIR New Delhi
- NIMS-IICT research centre
- UGC, India
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Nanocrystalline ZnO was found to be a highly efficient heterogeneous catalyst for the guanylation of amines with various carbodiimides to afford N,N',N ''-trisubstituted guanidines in excellent yields. Structurally divergent aliphatic, aromatic, heterocyclic primary and secondary amines were converted to the corresponding N,N',N ''-trisubstituted guanidines using optimal conditions. The catalyst was easy to handle even under atmospheric conditions and can be easily recovered by centrifugation and reused for five cycles with consistent activity. (C) 2012 Elsevier Ltd. All rights reserved.
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