Process for the preparation of substituted and unsubstituted-2,3-pyridinedicarboxylates from chloromaleate or chlorofumurate or mixtures thereof

摘要

There is provided a process for the preparation of dialkyl pyridinedicarboxylate compounds and derivatives thereof by reacting a dialkyl chloromaleate or chlorofumarate or a mixture thereof with an ammonium salt optionally in the presence of ammonia and an appropriately substituted (alpha),(beta)-unsaturated aldehyde or ketone.