Cesium carbonate → HCID 59702060, compound

Participants

Reaction Steps

A solution of 7-[4-(furan-2-carbonyl)-piperazin-1-yl]-5-oxo-4,5-dihydro-thieno[3,2-b]pyrdine-6-carboxylic acid ethyl ester (10) (750 mg, 1.87 mmol), Cs2CO3 (1.83 g, 5.63 mmol), 4-fluoro benzyl bromide (0.276 mL, 2.24 mmol) in dry NMP was heated overnight at 90° C. The solution was poured into ice water and the solids formed were filtered, washed by cold water, and dried. The crude product was purified by reverse phase flash chromatography in combiflash eluting with water/acetonitrile gradient. Yield 240 mg (25%). 1H-NMR (DMSO-d6) δ 1.27 (t, J=6.8 Hz, 3H), 3.36 (m, 4H), 3.82 (m, 4H), 4.26 (q, J=6.8 Hz, 2H), 5.35 (s, 2H), 6.65 (m, 1H), 7.06 (dd, J=0.8, 3.6 Hz, 1H), 7.16 (m, 2H), 7.32 (m, 3H), 7.87 (m, 1H), 8.03 (d, J=5.6 Hz, 1H); EIMS m/z 510 (M+1).

Provenance & Evidence