Carbonate Intermediates useful in the preparation of optically active cyclohexylphenylglycolate esters
US5973182A · kind A · utility
5Cited by
1References
4Claims
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Key dates
| Filing date | Oct 22, 1998 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Oct 22, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of optically active phenylcyclohexylglycolate esters is described. The process utilizes carboxylic acid activation to couple (R)- or (S)-cyclohexylphenylglycolic acid (CHPGA) with 4-N,N-diethylamino butynol or other propargyl alcohol derivatives. The preparation of the hydrochloride salt is also described. In addition, a resolution process employing tyrosine methyl ester enantiomers for preparing a single enantiomer of CHPGA from racemic CHPGA is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.