Pyridine → HCID 24744172, compound

Participants

Reaction Steps

To a solution of 7-amino-2,2-dimethyl-4-phenyl-2H-1,4-benzoxazin-3(4H)-one (compound obtained in Reference Example 1(3), 50 mg) in chloroform (2 mL) were added dropwise successively methanesulfonyl chloride (22 μL) and pyridine (30 μL) under ice-cooling and the mixture was stirred at room temperature for 18 hours. To the reaction mixture was added a saturated sodium hydrogencarbonate solution, and the mixture was extracted with chloroform. The organic layer was washed successively with water, 10% HCl solution and brine, dried over sodium sulfate and concentrated in vacuo. The resultant residue was purified by column chromatography on NH-silica gel (solvent; n-hexane/ethyl acetate=1/1→ethyl acetate) to give N-(2,2-dimethyl-3-oxo -4-phenyl-3,4-dihydro-2H-1,4-benzoxazin-7-yl)methanesulfonamide (55 mg) as a colorless powder. MS (APCI) m/z: 347 [M+H]+

Provenance & Evidence