Trifluoroacetic acid → HCID 53441883, compound

Participants

Reaction Steps

Of the compound from Example 85A, 800 mg (2.50 mmol) were dissolved in 20 ml of dichloromethane and admixed at 0° C. with 1.92 ml (25.0 mmol) of trifluoroacetic acid, then stirred at room temperature for 1 hour. The mixture was freed from the solvent and from the trifluoroacetic acid on a rotary evaporator. The crude product was taken up in 20 ml of toluene and again concentrated on a rotary evaporator under reduced pressure. Purification took place by chromatography on silica gel. By elution with ethyl acetate it was possible to separate off apolar impurities. Elution with dichloromethane/methanol/26% strength ammonia solution (10:1:0.1) gave 673 mg (79% of theory) of the target compound.

Provenance & Evidence