反应详情

To a 10 mL round-bottomed flask were added (1R)-1-[(4-amino-1-piperidinyl)methyl]-1,2-dihydro-4H,9H-imidazo[1,2,3-ij]-1,8-naphthyridine-4,9-dione (for a preparation see Example 5A(j)) (80 mg, 0.238 mmol), 4-fluoro-1H-benzimidazole-2-carbaldehyde (for a synthesis see WO2003087098, Example 320) (42.9 mg, 0.261 mmol), and sodium bicarbonate (100 mg, 1.190 mmol) in DCM (4 ml) and methanol (1 ml) to give a brown suspension. Sodium sulfate (200 mg, 1.408 mmol) was added and the reaction was stirred at rt overnight. After 15 h sodium triacetoxyborohydride (101 mg, 0.475 mmol) was added and the reaction was stirred at 25° C. under nitrogen for 4 h. The reaction mixture was adsorbed onto silica and purified using 0-10% MeOH/DCM (1% NH4OH) to give the free base of the title compound. The LCMS and 1H NMR were consistent with the desired product.

1. customto give a brown suspension
2. stirringthe reaction was stirred at 25° C. under nitrogen for 4 h
3. custompurified