Process for the preparation of 1,3-diaza-spiro (4.4) non-1-en-4-one derivatives and 1-cyano-1-acylaminocyclopentane intermediates
US6211382A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2000 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Apr 13, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the preparation of compounds of formula (I) wherein R means hydrogen atom, or C.sub.1-6 alkyl group, or C.sub.7-12 aralkyl group or phenyl group, characterised in that a) the compound of formula (III) is reacted with a compound of formula (IV) wherein X means halogen atom or C.sub.1-5 alkoxy group or hydroxyl group, and the resulting compound of formula (II) is transformed, in a reaction medium with pH above 7, into the compound of formula (I) or b) the compound of formula (III) is reacted with an anhydride of general formula (V) and the resulting compound of formula (II) transformed, in a reaction medium with pH above 7, into the compound of formula (I), or c) a compound of formula (II) is transformed, in a reaction medium with pH above 7, into the compound of formula (I), and if desired, the resulting compounds of formula (I), before or after isolation, are transformed into acid addition salts, or the compounds of formula (I) are liberated from their acid addition salts. Thus a process for the preparation of intermediates useful in synthesis of angiotensin II antagonists is disclosed. ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.