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A mixture of 1-[2-(4-aminopiperidin-1-yl)ethyl]-7-fluoroquinoxalin-2(1H)-one (Intermediate 140, 130 mg, 0.448 mmol), 2-oxo-1,2-dihydroquinoline-3-carbaldehyde (65 mg, 0.448 mmol) and 3 Å molecular sieves (100 mg) in methanol (6.0 mL) was heated at reflux for 2.5 hours under nitrogen atmosphere. It was cooled to 0° C. and sodium triacetoxy borohydride (189.5 mg, 0.996 mmol) was added and the mixture was allowed to warm to room temperature and stirred overnight. The mixture was filtered and purified through silica gel plug (eluting with 15% methanol in methylene chloride) to give title compound (71 mg).

1. temperaturewas heated
2. temperatureat reflux for 2.5 hours under nitrogen atmosphere
3. temperatureto warm to room temperature
4. filtrationThe mixture was filtered
5. custompurified through silica gel plug (eluting with 15% methanol in methylene chloride)