Sodium triacetoxyborohydride → 6-[({1-[2-(6,7-Difluoro-2-oxoquinoxalin-1(2H)-yl)ethyl]piperidin-4-yl}amino)methyl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one

Participants

Reaction Steps

1-[2-(4-Aminopiperidin-1-yl)ethyl]-6,7-difluoro quinoxalin-2(1H)-one (Intermediate 150, 190 mg, 0.62 mmol), 3-oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine-6-carbaldehyde (WO 2004/058144) (110 mg, 0.62 mmol), and sodium triacetoxy borohydride (390 mg, 1.90 mmol) were reacted as described according to Example 69 to give 180 mg (62%) of the free base of the product as a colorless solid.

Provenance & Evidence