4-Iodoanisole → (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(2-(4-methoxyphenyl)-1H-indol-3-yl)propanoic acid

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(S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(2-(4-methoxyphenyl)-1H-indol-3-yl)propanoic acid (1.12 g, 85%) was obtained from (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(1H-indol-3-yl)propanoic acid and 1-iodo-4-methoxybenzene using the procedure described for (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(2-(3-methoxyphenyl)-1H-indol-3-yl)propanoic acid. 1H NMR (400 MHz, DMSO-d6) δ 12.89-12.48 (m, 1H), 11.14 (s, 1H), 7.93-7.77 (m, 2H), 7.72-7.58 (m, 5H), 7.46-7.22 (m, 6H), 7.11-6.94 (m, 4H), 4.30 (dd, J=8.5, 6.0 Hz, 1H), 4.18-4.07 (m, 3H), 3.84-3.77 (s, 3H), 3.35 (m, 1H), 3.23-3.14 (m, 1H); [α]20D −9.44° (3.05 mg/mL, MeOH). LCMS retention time=1.810 min., m/z=533 (M+H), 97.3% purity. The LCMS data was obtained on a Shimadzu analytical LC/MICROMASS® Platform LC (ESI+) at 220 nm using The following set of conditions: PHENOMENEX® Luna 3 μm C18, 2×50 mm column, with a gradient of 0-100% B (B=90% HPLC grade acetonitrile/0.1% trifluoroacetic acid/10% HPLC grade water), (A=90% HPLC grade water/0.1% trifluoroacetic acid/10% HPLC grade acetonitrile), in 2 minutes with a 1 minute hold at a flow rate of 1 mL/minute.

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