Sodium cyanoborohydride → 7-Fluoro-8-{4-[4-(6-methoxyquinolin-8-yl)piperazin-1-yl]piperidin-1-yl}Quinoline

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Reaction Steps

To a solution of 1-(7-fluoroquinolin-8-yl)piperidin-4-one (Step 3, 0.26 g) and 6-methyoxy-8-(1-piperazinyl)quinoline (Example A, Step 4; 0.26 g) in anhydrous methanol (10 mL) was added sodium cyanoborohydride (0.11 g). The resulting mixture was stirred at room temperature under nitrogen for 18 hours. An additional aliquot of sodium cyanoborohydride (0.11 g) was added and stirring at room temperature was continued for another 24 hours. The resulting reaction mixture was poured into brine and extracted with ethyl acetate. The combined organic layers were dried over anhydrous Na2SO4, filtered and concentrated on a rotary evaporator. The crude product was purified by flash chromatography on silica gel using hexane/acetone to give the desired product, which was converted to its trihydrochloride salt in CH2Cl2 using 1M HCl/Et2O to provide 0.12 g of a yellow solid; MS (ES) m/z (relative intensity): 472 (M+H)+ (100).

Provenance & Evidence