Acetic Acid → 6-[(4R)-4-{[3-(7-Fluoro-2-oxoquinoxalin-1(2H)-yl)propyl]amino}-2-oxopyrrolidin-1-yl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one

Participants

Reaction Steps

Acetic acid (0.042 ml, 0.70 mmol) was added to a mixture of 3-(7-fluoro-2-oxoquinoxalin-1(2H)-yl)propanal (0.120 g, 0.54 mmol), 6-[(4R)-4-amino-2-oxopyrrolidin-1-yl]-2H-pyrido[3,2-b][1,4]oxazin-3(4H)-one (synthesized using [(3R)-5-oxopyrrolidin-3-yl]carbamic acid tert-butyl ester synthesized with reference to WO2004/22536 in the same manner as in Reference Examples 20, 21 and 22; 0.185 g, 0.70 mmol) and N,N-dimethylformamide (1.6 ml). The mixture was stirred for 0.5 hours, to which sodium triacetoxyborohydride (0.15 g, 0.70 mmol) was gradually added and stirred for 12 hours. An aqueous solution of sodium hydrogen carbonate was added to the reaction mixture under cooling on ice and the mixture was extracted with ethyl acetate. The obtained crude product was purified by thin layer chromatography (dichloromethane/methanol) to yield 70 mg (29%) of the title compound.

Provenance & Evidence