Sodium Bicarbonate → 6-[(4R)-4-({[3-(6-Fluoro-2-oxoquinoxalin-1(2H)-yl)propyl]amino}methyl)-2-oxopyrrolidin-1-yl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one

Participants

Reaction Steps

A mixture of 3-(6-fluoro-2-oxoquinoxalin-1(2H)-yl)propanal (0.1 g, 0.45 mmol), 6-[(4R)-4-(aminomethyl)-2-oxopyrrolidin-1-yl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one (Reference Examples 54, 0.11 g, 0.45 mmol) DMF (3 ml) and molecular sieve (4 A, 0.1 g) was stirred at room temperature for 20 minutes. The reaction mixture was cooled on ice and sodium triacetoxyborohydride (0.12 g, 0.54 mmol) was gradually added thereto. Then, the mixture was stirred at room temperature for 4 hours, a sodium hydrogen carbonate aqueous solution was added thereto and the mixture was extracted with ethyl acetate. The obtained crude product was purified by thin layer chromatography (dichloromethane/methanol) to yield the title compound. 8 mg (2%).

Provenance & Evidence