(+-)-Mercaptosuccinic acid → 2-[3'-(5-Carbamimidoyl-2-methylsulfanyl-thiophene-3-sulfonyl)-6-methyl-biphenyl-2-ylmethylsulfanyl]-succinic acid trifluoracetate

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Reaction Steps

2-Mercapto-succinic acid (0.004 g, 0.028 mmol) was added to a solution of methanesulfonic acid 3′-[5-(tert-butoxycarbonylamino-imino-methyl)-2-methylsulfanyl-thiophene-3-sulfonyl]-6-methyl-biphenyl-2-ylmethyl ester (0.017 g, 0.028 mmol) [example 214, step a] and triethylamine (0.009 g, 0.084 mmol) in dichloromethane [0.5 mL] at 40° C., stirred for 2 hours and then evaporated. The crude reaction was dissolved in a solution of dichloromethane/trifluoroacetic acid (1/1) [2 mL] and stirred for 1 hour. The reaction mixture was evaporated and purified via reverse-phase HPLC [acetonitrile/water (0.01% TFA)] to give the title compound (0.005 g, 42%) as a solid. 1H-NMR (MeOD): δ 8.31 (s, 1H), 8.06 (t, 1H, J=8.0 Hz), 7.83 (d, 1H, J=16.8 Hz), 7.70 (q, 1H, J=6.8 Hz), 7.57 (t, 1H, J=7.2 Hz), 7.29–7.21 (m, 3H), 3.60–3.48 (m, 1H), 3.54 (s, 3H), 3.37–3.34 (m, 1H), 2.70 (s, 3H), 2.68–2.57 (m, 1H), 2.31–2.14 (m, 1H), 1.97 (s, 3H). ESI-MS (m/z): Calcd. for C24H24N2O6S4: 564.05; found: 565.1.

Provenance & Evidence