Imidazole and triazole carboxylates, and processes for preparing 2,4-oxazolidinediones
US5552554A · kind A · utility
2Cited by
5References
10Claims
0Family size
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Key dates
| Filing date | May 9, 1995 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | May 9, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D249/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Processes are described for preparing 2,4-oxazolidinediones having Formula (I) ##STR1## wherein: R.sup.1 is phenyl optionally substituted with 1-2 halogens; or 4-phenoxy, 4-(1-phenethyloxy) or 4-benzyloxy each optionally substituted with R.sup.2 on the phenyl ring; and R.sup.2 is halogen; methyl; or ethyl. 2-Hydroxycarboxylic acid esters are reacted with a carbonylating agent in the presence of a base to give intermediate triazole or imidazole carboxylates. The carboxylates react with phenyl hydrazine in the presence of an acid to give the compounds of Formula (I).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.