Manufacturing method
US6455726B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Feb 14, 2001 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Feb 14, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C229/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A compound of the following formula (II) and a process for preparing of the compound of the following formula (I) its preparation whereinR1 is carboxy or protected carboxy;R2 is lower alkoxy or higher alkoxy;A1 is a divalent aromatic ring, a divalent heterocyclic group or a divalent cyclo(lower)alkane; andA2 is a divalent aromatic ring, a divalent heterocyclic group or a divalent cyclo(lower)alkane, or a salt thereof. The process comprises, reacting a compound of the formula (III): whereinR1, R2, A1 and A2 are each as defined above or a salt thereof, with an acid ammonium salt to give a compound of the formula (II).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.