<?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>S1870-249X2007000400013</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Efficient and Practical Synthesis of syn- and anti-&#946;,&#933;-Dihydroxyphosphonates Derived from (S)-Mandelic Acid]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Cabrera]]></surname>
<given-names><![CDATA[Haydée]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ochoa-Morales]]></surname>
<given-names><![CDATA[Joana]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Núñez]]></surname>
<given-names><![CDATA[Emanuel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Zertuche]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ordóñez]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma del Estado de Morelos Centro de Investigaciones Químicas ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2007</year>
</pub-date>
<volume>51</volume>
<numero>4</numero>
<fpage>237</fpage>
<lpage>244</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2007000400013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2007000400013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2007000400013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[A new efficient and practical synthesis of syn- and anti-&#946;,&#933;-dihydroxyphosphonates 1 and 2 was developed in high diastereoselectivity via reduction of &#946;-ketophosphonates readily obtained from (S)-mandelic acid. An example of "diastereoselective 1,2-induction" is showed and a mechanistic model to explain the stereochemical outcome is proposed. Assignment of the configuration at the new stereogenic centers was achieved by ¹H NMR spectral data of their corresponding acetonides.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se describe una nueva síntesis eficiente y práctica de syn- y anti-&#946;,&#933;-dihidroxifosfonatos 1 y 2 mediante la reducción diastereoselectiva de &#946;-cetofosfonatos fácilmente preparados a partir de ácido (S)-mandélico. Esta metodología representa un ejemplo de inducción "diastereoselectiva 1,2" y se propone un modelo mecanístico para explicar la alta diastereoselectividad. La configuración absoluta del nuevo centro estereogénico se llevó a cabo mediante el análisis de los espectros de RMN de ¹H de sus correspondientes acetales cíclicos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Diastereoselective 1,2-induction]]></kwd>
<kwd lng="en"><![CDATA[diastereoselective reduction]]></kwd>
<kwd lng="en"><![CDATA[&#946;,&#933;-dihydroxyphosphonates]]></kwd>
<kwd lng="en"><![CDATA[&#946;-ketophosphonates]]></kwd>
<kwd lng="en"><![CDATA[(S)-mandelic acid]]></kwd>
<kwd lng="es"><![CDATA[Inducción diastereoselectiva-1,2]]></kwd>
<kwd lng="es"><![CDATA[reducción diastereoselectiva]]></kwd>
<kwd lng="es"><![CDATA[&#946;,&#933;-dihidroxifosfonatos]]></kwd>
<kwd lng="es"><![CDATA[&#946;-cetofosfonatos]]></kwd>
<kwd lng="es"><![CDATA[ácido (S)-mandélico]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Efficient and Practical Synthesis of <i>syn&#45;</i> and <i>anti</i>&#45;&#946;,&#933;&#45;Dihydroxyphosphonates Derived from (<i>S</i>)&#45;Mandelic Acid</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Hayd&eacute;e Rojas&#45;Cabrera, Joana Ochoa&#45;Morales, Emanuel Hern&aacute;ndez&#45;N&uacute;&ntilde;ez, Mario Fern&aacute;ndez Zertuche and Mario Ord&oacute;&ntilde;ez*</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Centro de Investigaciones Qu&iacute;micas, Universidad Aut&oacute;noma del Estado de Morelos, Av. Universidad No. 1001. 62209 Cuernavaca, Morelos, M&eacute;xico</i>. E&#45;mail: <a href="mailto:palacios@ciq.uaem.mx">palacios@ciq.uaem.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 25 de octubre de 2007    ]]></body>
<body><![CDATA[<br> 	Aceptado el 12 de diciembre de 2007</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">A new efficient and practical synthesis of <i>syn&#45;</i> and <i>anti&#45;</i>&#946;,&#933;&#45;dihydroxyphosphonates <b>1</b> and <b>2</b> was developed in high diastereoselectivity via reduction of &#946;&#45;ketophosphonates readily obtained from (<i>S</i>)&#45;mandelic acid. An example of "diastereoselective 1,2&#45;induction" is showed and a mechanistic model to explain the stereochemical outcome is proposed. Assignment of the configuration at the new stereogenic centers was achieved by <sup>1</sup>H NMR spectral data of their corresponding acetonides.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Diastereoselective 1,2&#45;induction, diastereoselective reduction, &#946;,&#933;&#45;dihydroxyphosphonates, &#946;&#45;ketophosphonates, (<i>S</i>)&#45;mandelic acid.</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 una nueva s&iacute;ntesis eficiente y pr&aacute;ctica de <i>syn&#45;</i> y <i>anti</i>&#45;&#946;,&#933;&#45;dihidroxifosfonatos <b>1</b> y <b>2</b> mediante la reducci&oacute;n diastereoselectiva de &#946;&#45;cetofosfonatos f&aacute;cilmente preparados a partir de &aacute;cido (<i>S</i>)&#45;mand&eacute;lico. Esta metodolog&iacute;a representa un ejemplo de inducci&oacute;n "diastereoselectiva 1,2" y se propone un modelo mecan&iacute;stico para explicar la alta diastereoselectividad. La configuraci&oacute;n absoluta del nuevo centro estereog&eacute;nico se llev&oacute; a cabo mediante el an&aacute;lisis de los espectros de RMN de <sup>1</sup>H de sus correspondientes acetales c&iacute;clicos.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Inducci&oacute;n diastereoselectiva&#45;1,2, reducci&oacute;n diastereoselectiva, &#946;,&#933;&#45;dihidroxifosfonatos, &#946;&#45;cetofosfonatos, &aacute;cido (<i>S</i>)&#45;mand&eacute;lico.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v51n4/v51n4a13.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We gratefully acknowledge to CONACYT&#45;Mexico for financial support via grant 41657&#45;Q and 62271&#45;Q and graduate a fellowship to H.R.C. (170296). We also thank Victoria Labastida and Blanca E. Dom&iacute;nguez for their valuable technical support for the obtention of the MS and NMR spectra, respectively.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. 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