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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: Bioorg Med Chem Lett. 2018 Feb 3;28(6):1101–1105. doi: 10.1016/j.bmcl.2018.01.069

Table 1.

Inhibition of human thrombin by sulfated benzofuran dimers (SBDs).

R R′ R1 R1 IC50
(μM)a
ΔY
(%)a
1b Me Me Et Et 6.2±2.7c 75±1c
2a Me C6H11CH2 Et Et 2.6±0.1 63±1
2b Me Bnd Et Et 2.0±0.1 57±1
2c Me BnCH2 Et Et 1.8±0.1 58±1
2d Me pOMOM-Bn Et Et 3.3±0.2 61±2
2e Me mOMOM-Bn Et Et 4.0±0.5 59±5
2f Me pO-iPr-Bn Et Et 2.3±0.1 74±3
2g Me mO-iPr-Bn Et Et 2.6±0.1 57±1
2h C6H11CH2 C6H11CH2 Et Et 8.7±0.8 93±4
2i C6H11CH2 Bn Et Et 3.6±0.1 90±2
2j C6H11CH2 Me Et Et 3.8±0.3 77±3
2k Me Me Et Bn 4.9±0.2 68±2
2l Me Me Et BnCH2 3.2±0.2 58±3
2m Me Me Et pOMOM-Bn 2.6±0.1 66±2
2n Me Bn Xe Et 14±0.5 74±2
2o Me Yf Et Et >300g h
2p Me SO3Na Et Et >300g
Hirudin peptide (54 – 75) 1.3i
Fibrinogen peptide (410 – 427) 130i
a

IC50 and ΔY were measured spectrophotometrically using a chromogenic substrate hydrolysis assay in 20 mM Tris-HCl buffer, pH 7.4, containing 25 mM CaCl2, 100 mM NaCl and 0.1% PEG 8000 at 25 °C.

b

IC50 and ΔY taken from ref.10.

c

Errors represent ± 1 S.E.

d

Bn=benzyl.

e

X= —CH2CH2OSO3Na.

f

Y=Bn-mOSO3Na.

g

No inhibition was observed at 300 μM.

h

Not applicable.

i

Values taken from ref.18.