Conversion of pyridine-2,3-dicarboxylic acid esters to cyclic an

Details Conversion of pyridine-2,3-dicarboxylic acid esters to cyclic an Conversion of pyridine-2,3-dicarboxylic acid esters to cyclic an

1992-03-30

1993-05-04

Dentz, Bernard

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546321, 203 72, C07D491048

Patent

active

052083420

ABSTRACT:
In one embodiment this invention provides a process for converting a pyridine-2,3-dicarboxylic acid diester to the corresponding cyclic anhydride directly, without any recovery and purification of the pyridine-2,3-dicarboxylic acid intermediate.
An important aspect of the invention process is the utility of pure pyridine-2,3-dicarboxylic acid diester starting matter. A procedure for providing pure diester starting material is demonstrated.

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