Direct, enantioselective aldol coupling of aldehydes using chiral organic catalysts
US6900357B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 2003 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Apr 21, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Nonmetallic, chiral organic catalysts are used to catalyze an enantioselective aldol coupling reaction between aldehyde substrates. The reaction may be carried out with a single enolizable aldehyde, resulting in dimerization to give a β-hydroxy aldehyde, or trimerization to give a dihydroxy tetrahydropyran. The reaction may also conducted with an enolizable aldehyde and a second aldehyde, which may or may not be enolizable, so that the coupling is a cross-aldol reaction in which the α-carbon of the enolizable aldehyde adds to the carbonyl carbon of the second aldehyde in an enantioselective fashion. Reaction systems composed of at least one enolizable aldehyde, an optional additional aldehyde, and the nonmetallic chiral organic catalyst are also provided, as are methods of implementing the enantioselective aldol reaction in the synthesis of sugars.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.