反应详情

A mixture of 2-(hydroxymethyl)-7-chlorothieno[3,2-b]pyridine 114a (0.35 g, 1.8 mmole), 1-(2-chloro-ethyl)-pyrrolidine hydrochloride (31 g, 18 mmole), benzyltriethylammonium bromide (0.2 g, 0.7 mmole) and 19 M sodium hydroxide (10 mL) in toluene was refluxed for three hours. The reaction mixture was buffered with 50% saturated sodium bicarbonate and the workup was performed with ethyl acetate, brine and magnesium sulfate. The crude product was purified over silica gel (100 g) using 2–7% methanol-chloroform with 0.1% ammonium hydroxide, which provided the title compound as an amber oil (0.38 g, 62%): 1H-NMR (DMSO-d6, 400 MHz) δ 8.62 (1H, d, J=5.0 Hz), 7.58 (1H, s), 7.54 (1H, d, J=5.1 Hz), 4.86 (2H, s), 3.62 (2H, t, J=6.0 Hz), 2.64 (2H, t, J=5.8 Hz), 2.49–2.47 (4H, m), 1.67–1.63 (4H, m); MS m/z 297 (M+H)+.

1. temperaturewas refluxed for three hours
2. customThe crude product was purified over silica gel (100 g)