Preparation of 3,6-dihydro-2H-pyran-2-carboxylic esters
US6884897B2 · kind B2 · utility
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Key dates
| Filing date | Feb 19, 2003 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Feb 19, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D309/28
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is provided for preparing 3,6-dihydro-2H-pyran-2-carboxylic esters via a thermal hetero Diels-Alder reaction of 1,3-dienes with glyoxylic esters without the use of catalysts and stabilizers using a special metering technique.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.