Chloroform → (4R)-3-Fluoro-4-[(4-{[(2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]thiazin-7-yl)methyl]amino}-1-piperidinyl)methyl]-4,5-dihydro-7H-pyrrolo[3,2,1-de]-1,5-naphthyridin-7-one Hydrochloride

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(4R)-4-[(4-amino-1-piperidinyl)methyl]-3-fluoro-4,5-dihydro-7H-pyrrolo[3,2,1-de]-1,5-naphthyridin-7-one Enantiomer 1 (50 mg, 0.166 mmol) and 2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]thiazine-7-carboxaldehyde (for a synthesis see WO2004058144 Example 48(e)) (32 mg, 0.166 mol) were stirred in chloroform (1 mL) and methanol (1 mL) for 2 h at room temperature. Sodium cyanoborohydride (40 g) was added and the mixture was stirred for 18 h. The mixture was filtered and evaporated. Chromatography on silica, eluting with 0-20% methanol/dichloromethane, gave the free base of the title compound (31 mg, 39%).

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