Diisopropylethylamine → ethyl 6-[[3-methyl-4-[3-[5-[N-[(2-methylpropan-2-yl)oxycarbonyl]carbamimidoyl]-2-methylsulfanylthiophen-3-yl]sulfonylphenyl]phenyl]carbamoylamino]hexanoate

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Reaction Steps

Diisopropylethylamine (35 μL, 0.2 mmol), 6-isocyanato-hexanoic acid ethyl ester (40 μL, 0.2 mmol), and {[4-(4′-amino-2′-methyl-biphenyl-3-sulfonyl)-5-methylsulfanyl-thiophen-2-yl]-imino-methyl}-carbamic acid tert-butyl ester ((Example 220: step b) 20 mg, 0.04 mmol) were stirred for 24 h in DCM (1 mL). The solution was partitioned between EtOAc (40 mL) and 0.1 N HCl (10 mL) and was washed with additional 0.1N HCl (2×10 mL), NaHCO3 (10 mL), and brine (20 mL). The solution was dried, concentrated in vacuo, and purified by SiO2 preparative TLC to yield the product (12 mg, 43%). 1H-NMR (CDCl3): δ 8.06 (s, 1H), 7.94 (m, 1H), 7.81 (m, 1H), 7.46 (m, 2H), 7.23 (br t, 1H, J=5.4 Hz), 7.15 (m, 1H), 7.07 (m, 2H), 6.97 (m, 1H), 5.32 (br t, 1H), 4.15 (q, 2H, J=7.2 Hz), 2.40 (s, 3H), 2.30 (t, 2H, J=7.3 Hz), 2.11 (s, 3H), 1.54–1–70 (m, 4H), 1.51 (s, 9H) 1.35 (m, 2H), 1.25 (t, 3H, J=7.3 Hz).

Provenance & Evidence