5-Benzyloxytryptophan → 2-(4-But-2-ynyloxy-benzenesulfonylamino)-3-(5-benzyloxy-1H-indol-3-YL)-propionic acid

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The title compound was prepared by the method of Example 6, using 5-benzyloxy-DL-tryptophan and 4-but-2-ynyloxy-benzenesulfonyl chloride as starting materials. 1H NMR (DMSO-d6): 400 MHz δ 12.55 (bs, 1H), 10.64 (s, 1H), 8.05 (d, J=8.0 Hz, 1H), 7.50-7.33 (m, 7H), 7.19 (d, J=12.0 Hz, 1H), 7.03 (d, J=4.0 Hz, 1H), 6.97 (d, J=4.0 Hz, 1H), 6.87 (d, J=8.0 Hz, 2H), 6.76 (dd, J=8.0, 4.0 Hz, 1H), 5.04 (s, 2H), 4.74 (q, J=2.4 Hz, 2H), 3.86 (q, J=8.0 Hz, 1H), 3.00 (dd J=14.4, 6.4 Hz, 1H), 2.83 (dd J=14.4, 8.0 Hz, 1H), 1.82 (t, J=2.4 Hz, 3H); HRMS: calcd for C28H27N2O6S (ESI+, [M+H]1+), 519.1584; found 519.1588; LCMS m/z (ESI) [M+H] 519, retention time=2.99 min.

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