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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 38, 2008 - Issue 8
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Original Articles

Sulfamic Acid as an Effective Catalyst in Solvent‐Free Synthesis of β‐Enaminoketone Derivatives and X‐ray Crystallography of Their Representatives

Min Xia Department of Chemistry, Zhejiang Sci‐Tech University, Hangzhou, ChinaCorrespondence[email protected]
,
Bin Wu Department of Chemistry, Zhejiang Sci‐Tech University, Hangzhou, China
&
Guo‐Feng Xiang Department of Chemistry, Zhejiang Sci‐Tech University, Hangzhou, China
Pages 1268-1278 | Received 12 Oct 2007, Published online: 17 Apr 2008
 
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Abstract

Two types of β‐enaminoketone derivatives of 3‐(2‐oxo‐2‐arylethylidene)‐3,4‐dihydro‐1H‐quinoxalin‐2‐ones and 3‐(2‐oxo‐2‐arylethylidene)‐3,4‐dihydro‐benzo[1,4]oxazin‐2‐ ones were effectively and conveniently prepared in good to excellent yields under solvent‐free conditions via the catalysis of sulfamic acid in the corresponding condensations of o‐phenylenediamine and o‐aminophenol with ethyl 2,4‐dioxo‐4‐arylbutyrate respectively. The compounds were confirmed by IR, 1H NMR, and 13C NMR, and a representative was further determined by X‐ray crystallography.

Acknowledgment

We are grateful for the financial support from the Nature Science Foundation of Zhejiang Province (Project No. R405465).

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