Resorcinol → 2-[{4-[(2S)-2-{[(Allyloxy)carbonyl]amino}-3-({4-[3-hydroxy-2-(methoxycarbonyl)phenoxy]butyl}amino)-3-oxopropyl]phenyl}(carboxycarbonyl)amino]benzoic acid

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A mixture methyl 2-{4-[(N-[(allyloxy)carbonyl]-4-{{2-[(benzhydryloxy)carbonyl]phenyl}[tert-butoxy(oxo)acetyl]amino}-L-phenylalanyl)amino]butoxy}-6-hydroxybenzoate (89 mg, 0.10 mmol), 20 mg of resorcinol, and trifluoroacetic acid (1.5 mL) in methylene chloride (2.0 mL) was stirred for 5 hours, concentrated under reduced pressure. The crude product was purified on a Gilson preparative HPLC to provide the titled compound as a white powder (35 mg, 0.052 mmol, 52%). MS (ESI+) m/e 678 (M+H)+, 1H NMR (300 MHz, DMSO-d6) 1.40-1.66 (m, 4H), 2.68-2.83 (m, 1H), 2.83-2.98 (m, 1H), 2.98-3.15 (m, 2H), 3.72 (s, 3H), 3.90 (t, J=5.85 Hz, 1H), 4.09-4.12 (m, 1H), 4.33-4.41 (m, 2H), 5.08 (d, J=10.8 Hz, 1H), 5.18 (d, J=18.0 Hz, 1H), 5.70-5.90 (m, 1H), 6.47 (d, J=8.7 Hz, 1H), 7.25 (d, J=8.7 Hz, 1H), 7.29 (d, J=8.7 Hz, 1H), 7.36 (d, J=8.7 Hz, 1H), 7.38-7.66 (m, 3H), 7.93-8.03 (m, 2H), 9.92 (s, 1H).

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