反应详情

Sodium hydride (42 mg of a 60% dispersion in oil, 1.05 mmol) was added to a stirred solution of [4-(6-bromo-1H-indazol-3-yl)-piperidin-1-yl]-acetic acid tert-butyl ester (332 mg, 0.84 mmol) in DMF (7 ml) and after 30 min, a solution of 4-fluorobenzyl bromide (0.105 ml, 0.84 mmol), in DMF (7 ml) was added. The mixture stirred at +23° under nitrogen for 16 h, treated with water (25 ml), extracted with ethyl acetate (3×50 ml) and the combined, dried (Na2SO4) organic extracts were evaporated in vacuo to give an oil. This oil was purified by flash chromatography over silica gel (Merck 9385) eluting with dichloromethane--ethanol--880 ammonia (967:30:3) to give impure title compound. This was further purified by flash chromatography over silica gel (Merck 9385) eluting with ethyl acetate--cyclohexane (1:2) to give the title compound as a colourless oil (290 mg).

1. extractionextracted with ethyl acetate (3×50 ml)
2. dry with materialdried (Na2SO4) organic extracts
3. customwere evaporated in vacuo
4. customto give an oil
5. customThis oil was purified by flash chromatography over silica gel (Merck 9385)
6. washeluting with dichloromethane