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

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This compound was prepared from 7-benzyl-4-hydroxy-3-methyl-6-oxo-6,7-dihydro-thieno[2,3-b]pyrdine-5-carboxylic acid ethyl ester (61) by applying the method described for the preparation of 7-benzyl-6-oxo-4-[4-(thiophene-2-carbonyl)-piperazin-1-yl]-6,7-dihydro-thieno[2,3-b]pyridine-5-carboxylic acid ethyl ester (62). Yield 16%; MP 195° C. 1H-NMR (DMSO-d6) δ 1.29 (t, J=7.2 Hz, 3H), 2.53 (d, J=1.2 Hz, 3H), 4.29 (q, J=7.2 Hz, 2H), 5.27 (s, 2H), 6.94 (d, J=1.2 Hz, 1H), 7.16 (m, 1H) 7.28 (m, 3H), 7.33 (m, 2H), 7.43 (dd, J=0.8, 3.6 Hz, 1H), 7.79 (dd, J=0.8, 4.8 Hz, 1H) ppm; EIMS m/z 522 (M+1).

Provenance & Evidence