Pyridine → N-[(2R,4S,4aS)-rel-11-fluoro-2,4-dimethyl-2',4',6'-trioxo-1,1',2,3',4,4',4a,6'-octahydro-2'H,6H-spiro[isoxazolo[4,5-g][1,4]oxazino[4,3-a]quinoline-5,5'-pyrimidin]-8-yl]acetamide

Participants

Reaction Conditions

Reaction Steps

Pyridine (0.01 mL, 0.2 mmol) and acetic anhydride (0.10 mL, 0.14 mmol) were added sequentially to a solution of (2R,4S,4aS)-rel-8-amino-11-fluoro-2,4-dimethyl-1,2,4,4a-tetrahydro-2′H,6H-spiro[isoxazolo[4,5-g][1,4]oxazino[4,3-a]quinoline-5,5′-pyrimidine]-2′,4′,6′(1′H,3′H)-trione (Example 1, 54 mg, 0.13 mmol) in ethylene dichloride, and the mixture was stirred at 130° C. for 12 hours. After cooling to room temperature, solvent was removed, and the residue was purified over a silica gel flash column using a gradient of methanol in chloroform to give the title compound as a racemic mixture in the form of a yellow solid. Yield: 7.5 mg, (13%).

Provenance & Evidence