反应详情

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.

1. extractionextracted 3 times with aqueous Na2CO3
2. extractionsaturated with NaCl before being extracted 10 times with EtOAc
3. dry with materialThe EtOAc layers were dried (MgSO4) and solvent
4. customwas removed