Diisopropylethylamine → 3-((2R,6S)-2,6-dimethylmorpholino)-5-fluoropicolinic acid

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Reaction Steps

A solution of 3,5-difluoropicolinic acid (20.5 g, 128.86 mmol), cis-2,6-dimethylmorpholine (63.5 ml, 515.43 mmol) and DIEA (45.0 ml, 257.72 mmol) in THF (200 ml) was stirred at room temperature for 3 days. The mixture was diluted with EtOAc and extracted 3 times with aqueous Na2CO3. The aqueous layer was acidified with 1N HCl to bring pH to about 3 and was then saturated with NaCl before being extracted 10 times with EtOAc. The EtOAc layers were dried (MgSO4) and solvent was removed to give 33.5 g of product as a solid.

Provenance & Evidence