Asymmetric grignard synthesis with cyclic 1,2 aminoalcohols
US6025177A · kind A · utility
4Cited by
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22Claims
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Key dates
| Filing date | Feb 9, 1999 |
| Grant date | Feb 15, 2000 |
| Priority date | — |
| Expiry date | Feb 9, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Processes for preparing a single enantiomer of an .alpha.,.alpha.-disubstituted-.alpha.-hydroxy acetic acid, especially cyclohexylphenylglycolic acid (CHPGA), is disclosed. The processes employ cyclic 1,2-aminoalcohols as chiral auxiliaries by forming diastereomeric esters of aminoalcohols or diastereomeric amides of oxazolidines. ##STR1## Intermediates useful in the process are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.