Process for lactonization in the preparation of statins
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United States of America Patent
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Mar 16, 2010
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app pub date -
Sep 8, 2004
filing date -
Sep 8, 2004
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Abstract
The present invention relates to an improved and industrial friendly process for lactonization to produce compound of the Formula [I], from compound of the Formula [II] in presence of an inorganic compound as a suitable lactonizing agent, preferably alkali metal hydrogen sulfate, and crystallizing the obtained lactone product in a solvent; or treating compound of the Formula [II] in the presence of an inorganic compound preferably alkali metal hydrogen sulfate using phase transfer catalyst in heterogeneous phase followed by crystallizing the obtained lactone product in a solvent.
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