<?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>S1870-249X2005000100004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Highly Efficient Inversion of the C-3 Configuration in 1,2-0-Isopropylidenefuranose Derivatives by an Adapted Swern Oxidation/Sodium Borohydride Reduction Protocol in One Pot]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Gregorio]]></surname>
<given-names><![CDATA[Silvano]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quintero]]></surname>
<given-names><![CDATA[Leticia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sartillo-Piscil]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Facultad de Ciencias Químicas ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>49</volume>
<numero>1</numero>
<fpage>20</fpage>
<lpage>23</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2005000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2005000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2005000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[One pot Swern oxidation-sodium borohydride reduction of 1,2-O-isopropylidenefuranose derivatives having the D-gluco or D-xylo configurations led to the corresponding stereoisomers resulting from the stereoselective inversion of C-3. This method is a simple adaptation to the traditional procedure that consists in quenching the Swern oxidation at -60 °C with a mixture of H2O/EtOH (1:4), in which NaBH4 is dissolved. Thus, the inversion of the configuration at C-3 of 1,2-O-isopropylidenefuranose derivatives is accomplished in yields up to 98%.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La reacción de oxidación de Swern-reducción con borohidruro de sodio en un solo paso de los derivados de 1,2-O-isopropilidenofuranosa con configuración D-gluco o D-xilo, producen sus estereoisómeros correspondientes, los cuales provienen de la inversión estereoselectiva del C-3. Este método es una adaptación al procedimiento tradicional de oxidación de Swern, en donde al término de la reacción se adiciona una mezcla de H2O/EtOH (1:4) a -60 °C, en la cual se disuelve NaBH4. Así, la inversión de la configuración del C-3 en los derivados de 1,2-O-isopropylidenofuranosa se logra en rendimientos hasta del 98%.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Inversion of the configuration]]></kwd>
<kwd lng="en"><![CDATA[Swern oxidation-sodium borohydride reduction in one pot]]></kwd>
<kwd lng="es"><![CDATA[Inversión de configuración]]></kwd>
<kwd lng="es"><![CDATA[Oxidación de Swern-reducción borohidruro de sodio]]></kwd>
<kwd lng="es"><![CDATA[un solo paso]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font></p>  	    <p align="justify">&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Highly Efficient Inversion of the C&#45;3 Configuration in 1,2&#45;<i>0</i>&#45;Isopropylidenefuranose Derivatives by an Adapted Swern Oxidation/Sodium Borohydride Reduction Protocol in One Pot</b></font></p>     <p align="center">&nbsp;</p>      <p align="center"><font face="verdana" size="2"><b>Silvano Cruz&#45;Gregorio, Luis Hern&aacute;ndez, M&oacute;nica Vargas, Leticia Quintero,* and Fernando Sartillo&#45;Piscil.*</b></font></p>     <p align="center">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><i>Centro de Investigaci&oacute;n de la Facultad de Ciencias Qu&iacute;micas, Benem&eacute;rita Universidad Aut&oacute;noma de Puebla,14 Sur Esq. San Claudio, San Manuel 72570, Puebla, M&eacute;xico, Tel.: +52&#45;2222&#45;295500&#45;7387; fax: +52&#45;2222&#45;454293 </i>e&#45;mail: <a href="mailto:fsarpis@siu.buap.mx" target="_blank">fsarpis@siu.buap.mx</a></font></p>     <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2">Received February 8, 2005    ]]></body>
<body><![CDATA[<br>   Accepted March 29, 2005</font></p>     <p align="justify">&nbsp;</p>     <p align="justify"><font size="2" face="verdana"><b>Abstract</b></font></p>     <p align="justify"><font size="2" face="verdana">One pot Swern oxidation&#45;sodium borohydride reduction of 1,2&#45;<i>O</i>&#45;isopropylidenefuranose derivatives having the D<i>&#45;gluco</i> or D&#45;<i>xylo</i> configurations led to the corresponding stereoisomers resulting from the stereoselective inversion of C&#45;3. This method is a simple adaptation to the traditional procedure that consists in quenching the Swern oxidation at &#45;60 &deg;C with a mixture of H<sub>2</sub>O/EtOH (1:4), in which NaBH<sub>4</sub> is dissolved. Thus, the inversion of the configuration at C&#45;3 of 1,2<i>&#45;O</i>&#45;isopropylidenefuranose derivatives is accomplished in yields up to 98%.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Inversion of the configuration, Swern oxidation&#45;sodium borohydride reduction in one pot.</font></p>     <p align="justify">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">La reacci&oacute;n de oxidaci&oacute;n de Swern&#45;reducci&oacute;n con borohidruro de sodio en un solo paso de los derivados de 1,2<i>&#45;O</i>&#45;isopropilidenofuranosa con configuraci&oacute;n D<i>&#45;gluco</i> o D<i>&#45;xilo,</i> producen sus estereois&oacute;meros correspondientes, los cuales provienen de la inversi&oacute;n estereoselectiva del C&#45;3. Este m&eacute;todo es una adaptaci&oacute;n al procedimiento tradicional de oxidaci&oacute;n de Swern, en donde al t&eacute;rmino de la reacci&oacute;n se adiciona una mezcla de H<sub>2</sub>O/EtOH (1:4) a &#45;60 &deg;C, en la cual se disuelve NaBH<sub>4</sub>. As&iacute;, la inversi&oacute;n de la configuraci&oacute;n del C&#45;3 en los derivados de 1,2<i>&#45;O</i>&#45;isopropylidenofuranosa se logra en rendimientos hasta del 98%.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Inversi&oacute;n de configuraci&oacute;n, Oxidaci&oacute;n de Swern&#45;reducci&oacute;n borohidruro de sodio, un solo paso.</font></p>     <p align="justify">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v49n1/v49n1a4.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify">&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"> <b>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">We thank CONACyT for financial support, Project No. 35102 and scholarships numbers: 171952 and 171990; also thanks to Benem&eacute;rita Universidad Aut&oacute;noma de Puebla for a PROMEP professorship.</font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>References and Notes</b></font></p>      <p align="justify"><font face="verdana" size="2">1.&nbsp;Sigma&#45;Aldrich Co. 1,2:5,6&#45;di&#45;<i>O</i>&#45;isopropylidene&#45;&#945;&#45;D&#45;glucofura&#45;nose (25 g 37.7 dollar) and 1,2:5,6&#45;di&#45;<i>0</i>&#45;isopropylidene&#45;&#945;&#45;D&#45;allo&#45;furanose (1 g 53.1 dollar).</font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">2.&nbsp;Mitsunobu, O. <i>Synthesis</i> <b>1981</b>, 1&#45;28.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4887739&pid=S1870-249X200500010000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">3.&nbsp;(a) Martin, S. 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