Process for preparing montelukast and precursors thereof
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United States of America Patent
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Issued Date -
Oct 5, 2006
app pub date -
May 10, 2006
filing date -
May 10, 2006
priority date (Note) -
Abandoned
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Abstract
The present invention provides a process for stereoselectively reducing 2-[3-[3-[2-(7-chloro-2-quinolinyl)ethenyl]-phenyl]-3-oxopropyyl]benzoic-a-cid methyl ester, to produce to produce methyl 2-[3-(S)-[3-[2-(7-chloro-2-quinolinyl)-ethenyl]phenyl]-3-hydroxypropyl]be-nzoate, and a process for producing montelukast or a salt thereof. The present invention further provides a process for purifying methyl 2-[3-(S)-[3-[2-(7-chloro-2-quinolinyl)-ethenyl]phenyl]-3-hydroxypropyl]be-nzoate. The reduction process of the present invention uses a chiral reagent and can produce the desired reduction product in high enantiomeric excess (ee).
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