Dabco → 7-Benzyl-6-oxo-4-[4-(thiophene-2-carbonyl)-piperazin-1-yl]-6,7-dihydro-thieno[2,3-b]pyridine-5-carbonitrile

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A solution of 7-benzyl-4-chloro-6,7-dihydro-6-oxo-thieno[2,3-b]pyridine-5-carbonitrile (64) (0.750 g, 0.0025 mol), piperazin-1-yl-thiophen-2-yl-methanone (0.69 g, 0.0035 mol), and DABCO (0.56 g, 0.005 mol) in anhydrous DMF was heated at 110° C. for 12 h. The solution was cooled and poured into a 5% ammonium chloride aqueous solution and the precipitated solid was collected by vacuum filtration. The solid was purified by reverse phase chromatography (MeCN/water) to yield 0.330 g (29%) of 7-benzyl-6-oxo-4-[4-(thiophene-2-carbonyl)-piperazin-1-yl]-6,7-dihydro-thieno[2,3-b]pyridine-5-carbonitrile. MP 257° C.; 1H-NMR (DMSO-d6) δ 3.83 (m, 8H), 5.28 (s, 2H), 7.16 (m, 1H), 7.33 (m, 7H), 7.51 (d, J=3.2 Hz, 1H), 7.81 (d, J=4.8 Hz, 1H) ppm; EIMS m/z 461 (M+1).

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