Process for preparing montelukast and salts thereof
US8207343B2 · kind B2 · utility
1Cited by
2References
23Claims
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Key dates
| Filing date | May 25, 2009 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Jun 29, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D215/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for the preparation of montelukast and salts thereof has been described. The method comprises of following steps: (a) (S)-1-(3-((E)-2-(7-chloroquinolin-2-yl)vinyl)phenyl)-3-(2-isopropenylphenyl)propyl methane sulphonate (styrene mesylate salt) (b) coupling with 1-(mercapto methyl)cyclopropane acetic acid followed by salification with an amine gives styrene amine salt (c) Converting styrene amine salt to Montelukast amine salt (d) Converting Montelukast amine salt to Montelukast free acid and or its required alkali/alkaline salt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.