3-Chloropropanesulphonyl chloride → 4-(3-Chloro-propane-1-sulfonylamino)-3-methyl-benzofuran-2-carboxylic acid ethyl ester

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4-(3-Chloro-propane-1-sulfonylamino)-3-methyl-benzofuran-2-carboxylic acid ethyl ester was prepared from 4-amino-3-methyl-benzofuran-2-carboxylic acid ethyl ester (Example 60, Step 1), and 3-chloropropanesulfonyl chloride according to the procedure of Example 68, Step 1. Yield: 70%. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.4 (m, 3 H) 2.2 (m, 2 H) 2.8 (s, 3 H) 3.3 (m, 2 H) 3.8 (t, J=6.4 Hz, 2 H) 4.4 (q, J=7.2 Hz, 2 H) 7.2 (d, J=7.3 Hz, 1 H) 7.5 (m, 1 H) 7.7 (m, 1 H) 9.7 (s, 1 H).

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