Process for preparing a 2-hydroxymethyl-2,3-dihydro-thieno[3,4-b][1,4] dioxine-5,7-dicarboxylic acid diester
US6713637B2 · kind B2 · utility
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5Claims
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Key dates
| Filing date | May 5, 2003 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | May 5, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D495/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing a 2-hydroxymethyl-2,3-dihydro-thieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid diester comprising the reaction of the alkali salt of 3,4-dihydroxythiophene-2,5-dicarboxylic acid diester and epihalohydrin in a molar ratio in the range of 1.01 to 1.4 in a polar solvent or mixture of polar solvents at a temperature between −20° C. to the boiling point of the polar solvent or polar solvent mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.