Dichloromethane → (1R)-1-{[4-({[6-(Trifluoromethyl)-3-pyridinyl]methyl}amino)-1-piperidinyl]methyl}-1,2-dihydro-4H,9H-imidazo[1,2,3-ij]-1,8-naphthyridine-4,9-dione hydrochloride

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A solution of (1R)-1-[(4-amino-1-piperidinyl)methyl]-1,2-dihydro-4H,9H-imidazo[1,2,3-ij]-1,8-naphthyridine-4,9-dione (see Example 1 step (j) above: 400 mg, 1.33 mmol) and 6-(trifluoromethyl)-3-pyridinecarbaldehyde (233 mg, 1.33 mmol, from Apollo) in a mixture of DCM (5 ml) and MeOH (5 ml) was stirred at room temperature for 2 hour. NaBH(OAc)3 (1.7 g, 7.99 mmol) was then added and the mixture was stirred at room temperature. The reaction was monitored by LCMS. More aldehyde (47 mg, 0.27 mmol), and NaHB(OAc)3 (421 mg, 1.98 mmol) were added and when full conversion was observed, it was quenched with 10% NaHCO3 and extracted with DCM. The organic layer was dried (MgSO4), filtered, and concentrated. Purification by flash chromatography using a 70 g silica gel cartridge, and mixtures of DCM and MeOH as eluent afforded 463 mg (75%) of the expected product as the free base. It was dissolved in MeOH (50 ml). HCl (4M solution in 1,4-dioxane, 0.25 ml, 1 mmol) was added dropwise. After stirring at room temperature for 20 min, the solvent was evaporated. (1R)-1-{[4-({[6-(Trifluoromethyl)-3-pyridinyl]methyl}amino)-1-piperidinyl]methyl}-1,2-dihydro-4H,9H-imidazo[1,2,3-ij]-1,8-naphthyridine-4,9-dione hydrochloride (238 mg, 0.480 mmol, 36%) was obtained as a beige solid.

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