<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2008000200009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[&#947;-Lactones Upon Double Nucleophilic Additions of Bis(TMS)Ketene Acetals to &#928;-systems and Access to New-towards Cancer Cells Cytotoxic-Endoperoxide Lactones]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rudler]]></surname>
<given-names><![CDATA[Henri]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aldeco-Pérez]]></surname>
<given-names><![CDATA[Eugenia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parlier]]></surname>
<given-names><![CDATA[Andrée]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez]]></surname>
<given-names><![CDATA[Cecilio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chaquin]]></surname>
<given-names><![CDATA[Patrick]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herson]]></surname>
<given-names><![CDATA[Patrick]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toscano]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Apan]]></surname>
<given-names><![CDATA[María-Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Université Pierre et Marie Curie Laboratoire de Chimie Organique ]]></institution>
<addr-line><![CDATA[Paris ]]></addr-line>
<country>France</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Química ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2008</year>
</pub-date>
<volume>52</volume>
<numero>2</numero>
<fpage>145</fpage>
<lpage>174</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2008000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2008000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2008000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Arenechromium and cycloheptatrienechromium complexes react with (TMS)ketene acetals to give upon a double nucleophilic addition either diene-lactones or cyclohexenone-lactones. In the first case, the scope of the reaction and the stability of the dienes were examined: they could be easily transformed either in arylpropionic acids or in conjugated ketones and more interestingly, they reacted with oxygen to give new highly active cytotoxic endoperoxide lactones. Unfortunately, in the second case, no further functionalization could be achieved up to now.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se describe la reacción entre complejos arentricarbonilcromo y cicloheptatrientricarbonilcromo con acetales de bis(trimetil silil)cetena, la cual mediante una doble adición nucleofílica conduce a la formación tanto de dieno-lactonas como ciclohexenona-lactonas. En el primer caso, se examinó la estabilidad de los dienos: pudiendo éstos transformarse fácilmente en ácidos arilpropiónicos o en cetonas conjugadas y al reaccionar con oxígeno en nuevas endoperoxolactonas con actividad citotóxica importante. Desafortunadamente, en el segundo caso, no pudo realizarse la funcionalización posterior de dichas moléculas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Endoperoxide lactones]]></kwd>
<kwd lng="en"><![CDATA[cytotoxic activities]]></kwd>
<kwd lng="en"><![CDATA[&#947;-lactones]]></kwd>
<kwd lng="en"><![CDATA[feis(TMS)ketene acetals]]></kwd>
<kwd lng="en"><![CDATA[tricarbonylchromium complexes]]></kwd>
<kwd lng="en"><![CDATA[double nucleophilic additions]]></kwd>
<kwd lng="es"><![CDATA[ndoperoxolactonas]]></kwd>
<kwd lng="es"><![CDATA[actividad citotóxica]]></kwd>
<kwd lng="es"><![CDATA[&#947;-lactonas]]></kwd>
<kwd lng="es"><![CDATA[acetales de bis(trimetilsilil)cetena]]></kwd>
<kwd lng="es"><![CDATA[complejos de tricarbonilcromo]]></kwd>
<kwd lng="es"><![CDATA[doble adición nucleofílica]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Article</font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>&#947;&#150;Lactones Upon Double Nucleophilic Additions of <i>Bis</i>(TMS)Ketene Acetals to &Pi;&#150;systems and Access to New&#150;towards Cancer Cells Cytotoxic&#150;Endoperoxide Lactones</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Henri Rudler,<sup>1*</sup> Eugenia Aldeco&#150;P&eacute;rez,<sup>2</sup> Andr&eacute;e Parlier,<sup>1</sup> Cecilio &Aacute;lvarez,<sup>2</sup> Patrick Chaquin,<sup>1 </sup>Patrick Herson,<sup>1</sup> Alfredo Toscano,<sup>2</sup> and Mar&iacute;a&#150;Teresa Ram&iacute;rez&#150;Apan<sup>2</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Universit&eacute; Pierre et Marie Curie, Laboratoire de Chimie Organique, UMR 7611&#150;CNRS, Institut de Chimie Mol&eacute;culaire FR 2769, 4 place Jussieu, CC 47, 75252 Paris Cedex 5, France.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Instituto de Qu&iacute;mica, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Circuito Exterior, Ciudad Universitaria, Coyoac&aacute;n 04510, M&eacute;xico D.F., M&eacute;xico. <sup>*</sup>Responsible author: </i><a href="mailto:rudler@ccr.jussieu.fr">rudler@ccr.jussieu.fr</a>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 16 de noviembre de 2007    ]]></body>
<body><![CDATA[<br>   Aceptado el 20 de mayo de 2008</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">Arenechromium and cycloheptatrienechromium complexes react with (TMS)ketene acetals to give upon a double nucleophilic addition either diene&#150;lactones or cyclohexenone&#150;lactones. In the first case, the scope of the reaction and the stability of the dienes were examined: they could be easily transformed either in arylpropionic acids or in conjugated ketones and more interestingly, they reacted with oxygen to give new highly active cytotoxic endoperoxide lactones. Unfortunately, in the second case, no further functionalization could be achieved up to now.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Endoperoxide lactones, cytotoxic activities, &#947;&#150;lactones, feis(TMS)ketene acetals, tricarbonylchromium complexes, double nucleophilic additions.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Se describe la reacci&oacute;n entre complejos arentricarbonilcromo y cicloheptatrientricarbonilcromo con acetales de <i>bis</i>(trimetil silil)cetena, la cual mediante una doble adici&oacute;n nucleof&iacute;lica conduce a la formaci&oacute;n tanto de dieno&#150;lactonas como ciclohexenona&#150;lactonas. En el primer caso, se examin&oacute; la estabilidad de los dienos: pudiendo &eacute;stos transformarse f&aacute;cilmente en &aacute;cidos arilpropi&oacute;nicos o en cetonas conjugadas y al reaccionar con ox&iacute;geno en nuevas endoperoxolactonas con actividad citot&oacute;xica importante. Desafortunadamente, en el segundo caso, no pudo realizarse la funcionalizaci&oacute;n posterior de dichas mol&eacute;culas.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Endoperoxolactonas, actividad citot&oacute;xica, &#947;&#150;lactonas, acetales de <i>bis</i>(trimetilsilil)cetena, complejos de tricarbonilcromo, doble adici&oacute;n nucleof&iacute;lica.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
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