5-chloro-2-(piperazine-1-sulfonyl)-1H-indole → 1-(5-Chloroindol-2-ylsulphonyl)-4-[4-(1-imidazolyl)benzoyl]piperazine

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By an analogous method, starting from 4-(1-imidazolyl)benzoic acid hydrochloride and 1-(5-chloroindol-2-ylsulphonyl)piperazine, was prepared 1-(5-chloroindol-2-ylsulphonyl)-4-[4-(1-imidazolyl)benzoyl]piperazine (375 mg, 60% yield) as colourless crystals from acetone; m.p. 155-165° C., 1H NMR (d6DMSO) 3.0-3.2 ppm (broad s, 4H), 3.4-3.8 ppm (broad s, 4H), 7.0 ppm (s, 1H), 7.1 ppm (s, 1H), 7.3 ppm (dd, 1H), 7.5 ppm (m, 3H), 7.7 ppm (d, 2H), 7.8 ppm (m, 2M), 8.3 ppm (s, 1H), 12.4 ppm (broad s, 1H), the spectrum also contained a signal due to acetone, ca 0.05 mol. eq.; MS (M+H)+ 470/472.

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