One‐pot synthesis of quinazoline‐2,4(1<i>H</i>,3<i>H</i>)‐diones and 2‐thioxoquinazolinones with the aid of low‐valent titanium reagent

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<jats:title>Abstract</jats:title><jats:p> <jats:boxed-text content-type="graphic" position="anchor"><jats:graphic xmlns:xlink="http://www.w3.org/1999/xlink" mimetype="image/jpeg" position="anchor" specific-use="enlarged-web-image" xlink:href="graphic/mgra001.jpg"><jats:alt-text>magnified image</jats:alt-text></jats:graphic></jats:boxed-text></jats:p><jats:p>An efficient, convenient, one‐pot synthesis of 2,4(1<jats:italic>H</jats:italic>,3<jats:italic>H</jats:italic>)‐quinazolinediones and 2‐thioxoquinazolinones was accomplished in good yields <jats:italic>via</jats:italic> the novel reductive cyclization of ethyl 2‐nitrobenzoates with isocyanates or isothiocyanates mediated by TiCl<jats:sub>4</jats:sub>/Zn system. J. Heterocyclic Chem., (2009).</jats:p>

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