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US 2004/0110796 A1Published application
Alkyl esters of 3- (3,4-dihalophenyl) -2, 6 -di -oxopiperidine-3 -propionic acid of use as intermediates
AssigneeSanofi-Aventis
InventorsBertrand Castro, Jean-Robert Dormoy, Alain Rabion
Life of this patent
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Abstract
The invention relates to lower-alkyl esters of 3-(3,4-dihalophenyl)-2,6-dioxopiperidine-3-propionic acid derivatives, and to processes for preparing the same.
Claims21
Compound of formula:
- 12
- in which:
- X represents a halogen,
- R1 represents a linear C1-C4 alkyl.
1 more element
Use of a compound according to claim 21 in preparing a compound of formula:
- 24
- in which X represents a halogen, by cyclization.
Dependencies are inferred from the claim text.