4-(3-Fluoro-benzyl)-5-oxo-7-piperazin-1-yl-4,5-dihydro-thieno[3,2-b]pyridine-6-carboxylic acid ethyl ester → 4-(3-Fluoro-benzyl)-7-[4-(5-fluoro-thiophene-2-carbonyl)-piperazin-1-yl]-5-oxo-4,5-dihydro-thieno[3,2-b]pyridine-6-carboxylic acid ethyl ester

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This compound was prepared from 4-(3-fluoro-benzyl)-5-oxo-7-piperazin-1-yl-4,5-dihydro-thieno[3,2-b]pyridine-6-carboxylic acid ethyl ester (19) by applying the same procedure as described for 4-(3-fluoro-benzyl)-7-[4-(5-fluoro-thiophene-2-carbonyl)-piperazin-1-yl]-5-oxo-4,5-dihydro-thieno[3,2-b]pyridine-6-carboxylic acid isopropyl ester (21). Yield 2.22 g (85%). 1H-NMR (DMSO-d6) δ 1.29 (t, J=7.2 Hz, 3H), 3.39 (m, 4H), 3.82 (m, 4H), 4.27 (q, J=7.2 Hz, 2H), 5.38 (s, 2H), 6.80 (m, 1H), 7.10 (m, 3H), 7.29 (t, J=3.6 Hz, 1H), 7.33 (d, J=5.6 Hz, 1H), 7.36 (m, 1H), 8.03 (d, J=5.6 Hz, 1H); EIMS m/z 544 (M+1).

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