Sodium triacetoxyborohydride → Tert-butyl 4-{2-[4-(1-methyl-6-oxo-1,6-dihydro-[4,4']bipyrimidinyl-2-yloxy)piperidin-1-yl]ethyl}piperidine-1-carboxylate

Beteiligte Stoffe

Reaktionsschritte

To a mixture of 1-methyl-2-(piperidin-4-yloxy)-1H-[4,4′]bipyrimidinyl-6-one (290 mg, 1.0 mmol), tert-butyl 4-(2-oxo-ethyl)piperidine-1-carboxylate (300 mg 1.3 mmol) and acetic acid (one drop) in 1,2-dichloroethane (5.0 ml) was added sodium triacetoxyborohydride (530 mg, 2.5 mmol). The mixture was stirred at room temperature overnight. The mixture was partitioned between water and dichloromethane. The organic layer was washed with brine, dried over sodium sulfate, and concentrated in vacuo. The residue was purified by NH-silica gel column chromatography (eluent; hexane/ethyl acetate=30/70) to afford tert-butyl 4-{2-[4-(1-methyl-6-oxo-1,6-dihydro-[4,4′]bipyrimidinyl-2-yloxy)piperidin-1-yl]ethyl}piperidine-1-carboxylate as a colorless solid (340 mg, 0.67 mmol, 67%).

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