Trifluoroacetic acid → 3-[2-Methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenyl]-propionic Acid

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Reaction Steps

Trifluoroacetic acid (5 ml) was added to a solution of 3-[2-methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenyl]-propionic acid tert-butyl ester from Example E45.3 (413 mg, 0.92 mmol) in dichloromethane (10 ml) and the mixture was stirred for 45 min at room temperature. Solvents were removed in vacuo and azeotroped with dichloromethane. The residue was crystallised with MeOH/Et2O to yield the title compound (322 mg, 90%).

Provenance & Evidence