Ethyl Acetate → tert-butyl N-[4-[3-[2-[(2-bromoacetyl)amino]-6-methylphenyl]phenyl]sulfonyl-5-methylsulfanylthiophene-2-carboximidoyl]carbamate

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Reaction Steps

Following the procedure described for Example 234, step a, reaction of {[4-(6′-amino-2′-methyl-biphenyl-3-sulfonyl)-5-methylsulfanyl-thiophen-2-yl]-imino-methyl}-carbamic acid tert-butyl ester (137 mg, 0.265 mmol, as prepared in Example 25, step c), bromoacetyl bromide (28 μL, 0.32 mmol), and DIEA (70 μL, 0.40 mmol) in chloroform (3 mL) afforded 129 mg (76%) of the title compound as a yellow foamy solid after chromatography (PTLC, 10% EtOAc in DCM, 2×1500μ SiO2 plate). 1H-NMR (CDCl3; 400 MHz): δ 8.05–8.10 (m, 1H), 7.85–7.95 (m, 2H), 7.65–7.73 (m, 2H), 7.46–7.51 (m, 1H), 7.35 (t, 1H, J=7.9 Hz), 7.16 (d, 1H, J=7.7 Hz), 3.64 and 3.74 (AB quartet, 2H, J=14.0 Hz), 2.60 (s, 3H), 2.03 (s, 3H), 1.52 (s, 9H). ESI-MS (m/z): Calcd. for C26H28BrN3O5S3: 637.0 (M+H); found: 637.8, 639.8, 538.0, 540.0 (M−Boc).

Provenance & Evidence