Journal
ORGANIC PROCESS RESEARCH & DEVELOPMENT
Volume 5, Issue 6, Pages 572-574Publisher
AMER CHEMICAL SOC
DOI: 10.1021/op010012k
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2,3-Dichloropyridines undergo a mono- or a dicarbonylation in the presence of carbon monoxide, an alcohol, and a palladium catalyst, affording selectively either alkyl 3-chloropyridine-2-carboxylates or dialkyl pyridine-2,3-dicarboxylates in good yields, depending on the reaction conditions. For instance, the process could be scaled up for the monoalkoxycarbonylation of 2,3-dichloro-5-(trifluoromethyl)pyridine, affording in high yield and selectivity the corresponding 3-chloro-5-(trifluoromethyl)pyridine-2-carboxylate.
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