50372-61-7Relevant articles and documents
Oxidative Halogenation of Substituted Pyrroles with Cu(II). Part III. Bromination and Chlorination of 2-Benzoylpyrrole
Petruso, S.,Caronna, S.
, p. 355 - 357 (2007/10/02)
The bromination of 2-benzoylpyrrole with copper (II) bromide in the homogenous and heterogenous phase is described, giving 4- and 5-monobromo derivatives whose ratio decreases as the temperature is increased.The same reaction with copper(II) chloride in acetonitrile at 60 deg C produces 5-chloro-2-benzoylpyrrole as the major product. 4,5-Dihalopyrroles in good yields are obtained with an excess of halogenating agent.
Processes for preparing 5-benzoyl-7-halo-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylic acids
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, (2008/06/13)
5-benzoyl-7-halo-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylic acids, represented by the formula STR1 and the pharmaceutically acceptable non-toxic esters and salts thereof, wherein: R is hydrogen or lower alkyl; X is hydrogen, lower alkyl, lower alkoxyl, lower alkoxycarbonyl, carboxyl, lower alkylcarbonyl, sulfonic acid, sulfonic acid alkyl ester, fluoro, chloro, or bromo; and Y is chloro or bromo, which are novel, and 5-benzoyl-1,2-dihydro-3H-pyrrolo[1,2-a]pyrrole-1-carboxylic acids which are represented by the formula STR2 wherein X and R are as above defined except that X cannot be chloro or bromo, are prepared by decarboxylation of the corresponding 1,1 dicarboxylates. Intermediates in said preparation are also disclosed.