Synthesis of carboxylic acid derivatives
US5986132A · kind A · utility
2Cited by
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6Claims
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Key dates
| Filing date | May 14, 1998 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | May 14, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D305/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Compounds of formula (I) wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, X are as defined in the specification and are prepared by elimination of one of the groups X.sub.1 and X.sub.2 from a compound of formula (II) wherein X.sub.1 and X.sub.2 each independently represent a carboxylic acid group or salt thereof, or a protected carboxylic acid group, the non-eliminated group X.sub.1 or X.sub.2 corresponding to the group X in the desired compound of formula (I). ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.