Process for the separation of optical isomers of racemic 3-alkylpiperidine-carboxylic acid ethyl esters
US11091436B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Mar 12, 2018 |
| Grant date | Aug 17, 2021 |
| Priority date | — |
| Expiry date | Mar 12, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07B2200/07
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The subject-matter of the invention is process for the separation of optical isomers of racemic 3-alk-3-carboxylic acid ethyl esters of formula rac-I with the resolving agent (II) (−)-2,3:4,5-di-O-izopropylidene-2-keto-L-gulonic acid (hereinafter: diacetone-L-ketogulonic acid).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.