Method for preparing high-purity sulfonamide compound, and intermediate of sulfonamide compound
US9950997B2 · kind B2 · utility
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6References
7Claims
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Key dates
| Filing date | Sep 10, 2017 |
| Grant date | Apr 24, 2018 |
| Priority date | — |
| Expiry date | Sep 10, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2527/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention discloses a method for preparing a high-purity sulfonamide compound and an intermediate of the sulfonamide compound. The method comprises the following steps: a, taking a crude product of a sulfonamide compound (I) as an initial raw material, and enabling the raw material to react with a compound of a formula (II) in presence of alkali and a catalyst so as to synthesize an intermediate of a formula (III); and b, enabling the compound represented by the formula (III) to react with alkali or acid, thereby obtaining the high-purity sulfonamide compound (I).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.