m-Chloroperbenzoic acid → HCID 22147654、化合物
反応式
[F:1][CH:2]([F:18])[S:3]([C:5]1[C:14](=[O:15])[C:13]2[C:8](=[CH:9][C:10]([F:16])=[CH:11][CH:12]=2)[N:7]([CH3:17])[CH:6]=1)=[O:4].C1C=C(Cl)C=C(C(OO)=[O:27])C=1>C(Cl)Cl>[F:18][CH:2]([F:1])[S:3]([C:5]1[C:14](=[O:15])[C:13]2[C:8](=[CH:9][C:10]([F:16])=[CH:11][CH:12]=2)[N:7]([CH3:17])[CH:6]=1)(=[O:27])=[O:4]参加物
4
実験手順
To a solution of 3-difluoromethylsulfinyl-7-fluoro-1-methyl-4-quinolone (5) (79 mg, 0.287 mmol) in DCM (8 mL) was added ˜80% MCPBA (55.7 mg, 0.258 mmol). The mixture was stirred at a room temperature overnight. An additional amount of MCPBA (15 mg) was added and stirring was continued for 3 days. The mixture was diluted with DCM (10 mL), washed with 5% aqueous Na2CO3 (3×5 mL), the aqueous layers were extracted with DCM (2×10 mL), the combined organic extracts were dried over anhydrous sodium sulfate and concentrated. The residue, e.g., the crude product, was recrystallized from ethyl acetate to give 27 mg (32%) of white crystals [3-difluoromethyl sulfonyl-7-fluoro-1-methyl-4-quinolone (6)]. The filtrate was chromatographed on silica gel with ethyl acetate-hexane (gradient 1:2, 1:1) to give second crop of the product [3-difluoromethylsulfonyl-7-fluoro-1-methyl-4-quinolone (6)] (32 mg, 38%) for a total yield 70%. This 3-difluoromethylsulfonyl-7-fluoro-1-methyl-4-quinolone gave the following NMR profile: