Synthetic methods for preparing procyanidin oligomers
US7015338B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1999 |
| Grant date | Mar 21, 2006 |
| Priority date | — |
| Expiry date | Apr 15, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Processes are disclosed for the production of linear and branched procyanidin oligomers having “n” procyanidin monomeric units where n is 2 to 18. The processes include coupling protected, activated monomers with an unprotected monomer to produce a partially protected (4→8) dimer. The dimer is optionally blocked, coupled with an activated protected monomer to produce a partially protected, optionally blocked trimer, and deprotected. The steps can be repeated to produce higher oligomers. Processes are also provided for producing (8→8), (8→6), and (6→6) dimers and doubly branched oligomers. Crystalline 8-bromo-tetra-O-benzyl-(−)-epicatechin is produced under certain conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.