Ketorolac → Ketorolac Tromethamine

Participants

Reaction Conditions

Reaction Steps

Ketorolac acid (20 gm, Abbott Laboratories) was dissolved in 156.0 gm of isopropanol. A solution of 12.0 gm of tromethamine in 25.0 gm of water was added, and the mixture was heated to 40° C. to a solution. The solution was filtered thru a 0.2 micron filter. To the clear filtrate was added 356.0 gm of ethyl acetate, and the ternary solution was distilled under atmospheric conditions to approximately half the volume. Another aliquot of 356.0 gm of ethyl acetate was added and the mixture distilled to approximately half the volume. At this point solid started precipitating out. Ethyl acetate (356.0 gm) was added once more and the mixture distilled to approximately half the volume. The solution was cooled to 10° C. and the solid ketorolac tromethamine was isolated by filtration. The collected solids were dried under vacuum to afford 36.1 gm of the desired product. HPLC analysis showed a purity of >99% of the desired compound.

Provenance & Evidence