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

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Reaction Steps

Trifluoroacetic acid (5 ml) was added to a solution of (E)-3-[2-methyl-4-(3-methyl-4,10-dihydro-3H-2,3,4,9-tetraaza-benzo[f]azulene-9-carbonyl)-phenyl]-acrylic acid tert-butyl ester from Example E45.2 (338 mg, 0.76 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 to yield the title compound (337 mg, 80%).

Provenance & Evidence