Unsymmetrical tetrasubstituted ureas from tertiary carbamoylimidazole: activation by AlMe3

A. Velavan; S. Sumathi; K. K. Balasubramanian

doi:10.1039/C2OB25412C

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Organic & Biomolecular Chemistry

Issue 31, 2012

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Unsymmetrical tetrasubstituted ureas from tertiary carbamoylimidazole: activation by AlMe₃

A. Velavan,^a S. Sumathi*^a and K. K. Balasubramanian*^a

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Department of Chemistry, Hindustan University, Rajiv Gandhi Salai, Padur, (Via) Kelambakkam, Chennai 603 103, India
E-mail: kkbalu@hotmail.com

Org. Biomol. Chem., 2012,10, 6420-6431

DOI: 10.1039/C2OB25412C
Received 25 Feb 2012, Accepted 01 Jun 2012
First published online 13 Jun 2012

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Abstract
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An efficient and general method for the synthesis of unsymmetrical tetrasubstituted ureas from carbamoylimidazole is described. The conversion is achieved by the concurrent quarternization of the imidazole nitrogen and activation of amines with AlMe₃.

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Unsymmetrical tetrasubstituted ureas from tertiary carbamoylimidazole: activation by AlMe3

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Unsymmetrical tetrasubstituted ureas from tertiary carbamoylimidazole: activation by AlMe₃