4-(Chlorosulfonyl)-2-hydroxybenzoic acid → 4-{4-[2-(2-Benzyl-benzo[b]thiophen-3-yl)-ethyl]-phenoxysulfonyl}-2-hydroxy-benzoic acid

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Reaction Steps

The title compound was prepared according to the procedure in Example 4 using 4-[2-(2-benzyl-benzo[b]thiophen-3-yl)-ethyl]-phenol (0.400 g, 1.16 mmol) and 4-chlorosulphonyl-2-hydroxybenzoic acid (0.550 g, 2.32 mmol). Purification on 2% H3PO4 /MeOH treated silica gel, eluting with 20% EtOAc/hexane gave the title compound as an off white solid, mp 57-59° C. 1H NMR (DMSO-d6) δ 2.74 (t, 2 H), 3.09 (t, 2 H), 4.00 (s, 2 H), 6.97 (d, 2 H), 7.19-7.23 (m, 5 H), 7.27-7.38 (m, 6 H), 7.76 (d, 1 H), 7.83 (dd, 1 H), 7.98 (d, 1 H). IR (KBr) 3400, 2950, 1675, 1390 and 1190 cm-1. mass spectrum (-ESI) m/z 543 (M-H).

Provenance & Evidence