Trisubstituted benzene derivatives and a method for the preparation thereof
US4639535A · kind A · utility
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4Claims
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Key dates
| Filing date | Oct 30, 1985 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Oct 30, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D335/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed are trisubstituted benzene derivatives of the formula ##STR1## wherein B is selected from the group consisting of --NHCOC(CH.sub.3).sub.3, 1,3-oxazolinyl and --CONHR, wherein R is methyl, phenyl, or t-butyl; Y is selected from the group consisting of CO.sub.2 H, CHO, CO.sub.2 R' and COR', wherein R' is a lower alkyl having from 1 to 4 carbon atoms; and A is H or tetrahydropyran. Said compounds are valuable intermediates in the preparation of certain anti-allergic chromone or thiochromone-5-oxamic acid derivatives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.