Method for recovering optically pure amino acid derivatives
US5670647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1996 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Mar 1, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C227/40
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for recovering an optically pure amino acid derivative from a waste liquor collected after a coupling reaction in peptide synthesis, comprising the steps of (a) adding into the waste liquor, in which an uncoupled amino acid derivative or an uncoupled small peptide fragment is contained, a compound selected from the group consisting of 1-hydroxybenzotriazole (HOBt), 1-hydroxy-7-azabenzotriazole (HOAt), 3-hydroxy-4-oxo-3,4-dihydro-1,2,3-benzotriazine (HOObt) and N-hydroxy-5-norbornen-2,3-dicarboxylic acid imide(HONB); (b) concentrating the waste liquor obtained in step (a); (c) treating a residue obtained in step (b) with an acidic buffer solution containing a tertiary amine; and (d) extracting and purifying the uncoupled amino acid derivative or the uncoupled small peptide fragment under acidic conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.