2,6-Bis(trifluoromethyl)benzoic acid → N-Benzoyl-L-valyl-L-alanyl-L-norleucine 2,6-bis (trifluoromethyl)benzoyloxy methyl ketone

Participants

Reaction Steps

A mixture of potassium fluoride (0.1 mmol, 6 mg) and 2,6-bis(trifluoromethyl)benzoic acid (0.066 mmol, 17 mg) in dry DMF (500 μl) was stirred over molecular sieves at room temperature for 5 minutes. A solution of N-benzoyl-L-valyl-L-alanyl-L-norleucine bromomethyl ketone (0.033 mmol), 16 mg) in dry DMF (500 μl) was added and the reaction mixture stirred for 1 hour. The reaction mixture was passed through a short silica plug and washed with 5% methanol in dichloromethane. Solvent was removed under vacuum and the residue purified using prep. HPLC. Freeze drying afforded (6.4 mg) as a white lyophilisate. Electrospray MS m/z 660 [MH+ ]. ##STR6##

Provenance & Evidence