Morpholine → 6-(Morpholine-4-carbonyl)nicotinic acid, t-butyl ester

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Reaction Steps

For example, the 2,5-pyridinedicarboxylic acid, 2-methyl ester, 5-t-butyl ester (5) is contacted with a molar excess of morpholine in an appropriate organic solvent, such as tetrahydrofuran. The reaction is typically conducted at a temperature range of from room temperature to reflux and for a period of time ranging from 5 hours to 3 days. The 6-(morpholine-4-carbonyl)nicotinic acid, t-butyl ester (6) is isolated from the reaction mixture by standard extractive methods as is known in the art and may be purified by crystallization.

Provenance & Evidence