Chloroform → 3-Fluoro-4-({(3R,4S)-4-[(3,4-dihydro-2H-pyrano[2,3-c]pyridin-6-ylmethyl)amino]-3-hydroxy-1-piperidinyl}methyl)-4,5-dihydro-7H-pyrrolo[3,2,1-de]-1,5-naphthyridin-7-one Hydrochloride

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A mixture of 4-{[(3R,4S)-4-amino-3-hydroxy-1-piperidinyl]methyl}-3-fluoro-4,5-dihydro-7H-pyrrolo[3,2,1-de]-1,5-naphthyridin-7-one Diastereomer 1 (54 mg), 3,4-dihydro-2H-pyrano[2,3-c]pyridine-6-carbaldehyde (for a synthesis see WO2004058144, Example 126(c)) (20.6 mg) and 3A molecular sieves in chloroform (1 ml) and methanol (1 ml) was heated at 65° C. for 5 h, cooled and then sodium triacetoxyborohydride (53 mg) was added. The general procedure of Example 72 was then followed to obtain the free base of the title compound (41 mg, 70%).

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