Production process
US6291680A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1999 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Dec 20, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C229/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A compound of formula (1) or a salt thereof: ##STR1## wherein R.sup.1 is a carboxy or a protected carboxy; R.sup.2 is a lower alkoxy or a higher alkoxy; A.sup.1 is a divalent aromatic ring, a divalent heterocyclic group or a divalent cyclo(lower)alkane; and A.sup.2 a divalent aromatic ring, a divalent heterocyclic group or a divalent cyclo(lower)alkane; is prepared by reacting a compound of formula (III) or a salt thereof with acid ammonium salt: ##STR2## wherein R.sup.1, R.sup.2, A.sup.1 and A.sup.2 are each as defined above; to give a compound of formula (II) or a salt thereof which is further reacted with a salt of hydroxylamine: ##STR3## wherein R.sup.1, R.sup.2, A.sup.1 and A.sup.2 are each as defined above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.