反应详情

In an alternative procedure, FTY720 free base (2.27 mmol) was dissolved in ethyl acetate (16 ml) at 88-90° C. Then a solution of propionic acid (2.5 eq) in ethyl acetate (3 ml) was added at 70° C., whereupon the product started to crystallize out immediately after addition. The resulting suspension was cooled to room temperature. The product was collected by filtration and was washed with ethyl acetate (2 ml). After drying at 50° C. the product was obtained as white crystals in 96.9% yield.

1. customto crystallize out immediately
2. additionafter addition
3. filtrationThe product was collected by filtration
4. washwas washed with ethyl acetate (2 ml)
5. customAfter drying at 50° C. the product
6. customwas obtained as white crystals in 96.9% yield