反应详情

A solution of 1-[2-(4-amino-1-piperidinyl)ethyl]-7-fluoro-2(1H)-quinoxalinone dihydrochloride (60 mg; 0.166 mmol) and 3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine-6-carboxaldehyde (for a synthesis see WO2003087098, Example 31(e))(35 mg, 0.20 mmol) in MeOH (3 ml), chloroform (3 ml) and triethylamine (0.06 ml) was heated under reflux with 3A molecular sieves overnight. It was cooled and sodium triacetoxyborohydride (0.11 g; 0.52 mmol) was added, and the mixture was stirred at rt for 7-8 h. Aqueous sodium bicarbonate solution was added to basify and the aqueous phase was extracted several times with 10% MeOH-DCM. The organic fractions were dried and evaporated. Chromatography on silica gel, eluting with 0-20% MeOH-DCM gave the free base of the title compound (68 mg, 91%).

1. temperatureIt was cooled
2. extractionthe aqueous phase was extracted several times with 10% MeOH-DCM
3. customThe organic fractions were dried
4. customevaporated
5. washChromatography on silica gel, eluting with 0-20% MeOH-DCM