反应详情

温度

23 °C

Ethyl 6-iodo-4-oxo-1-(piperidin-3-yl)-1,4-dihydroquinoline-3-carboxylate hydrochloride (Intermediate 132, 500 mg, 1.08 mmol) was suspended in methanol (15 mL) then 4-pyridinecarboxaldehyde (520 μl, 5.4 mmol) and sodium cyanoborohydride (612 mg, 9.7 mmol) were added. The reaction was stirred at 23° C. for 16 h. The volume of the reaction was reduced by half and water (25 mL) was added. The suspension was extracted with 2:1 ethyl acetate: tetrahydrofuran (3×, 10 mL). The organic phases were combined, dried over sodium sulfate, and the solvent was removed in vacuo. The residue was passed through a plug of silica gel (2 g) eluting with 10% methanol in dichloromethane to remove any remaining borohydride. The solid was then dried in a vacuum oven at 50° C. for 18 h to give 460 mg (82% yield) of ethyl 6-iodo-4-oxo-1-(1-(pyridin-4-ylmethyl)piperidin-3-yl)-1,4-dihydroquinoline-3-carboxylate as an off white solid.

1. additionwas added
2. extractionThe suspension was extracted with 2:1 ethyl acetate
3. dry with materialdried over sodium sulfate
4. customthe solvent was removed in vacuo
5. washeluting with 10% methanol in dichloromethane
6. customto remove any remaining borohydride
7. customThe solid was then dried in a vacuum oven at 50° C. for 18 h