Acetic Anhydride → 4-Acetoxy-3-pyridine-4-yl-4-m-tolyl-cyclopent-2-en-1-one

反応式

[OH:1][C:2]1([C:14]2[CH:15]=[C:16]([CH3:20])[CH:17]=[CH:18][CH:19]=2)[CH2:6][C:5](=[O:7])[CH:4]=[C:3]1[C:8]1[CH:13]=[CH:12][N:11]=[CH:10][CH:9]=1.CN(C1C=CC=CN=1)C.[C:30](OC(=O)C)(=[O:32])[CH3:31]>C(Cl)Cl>[C:30]([O:1][C:2]1([C:14]2[CH:15]=[C:16]([CH3:20])[CH:17]=[CH:18][CH:19]=2)[CH2:6][C:5](=[O:7])[CH:4]=[C:3]1[C:8]1[CH:9]=[CH:10][N:11]=[CH:12][CH:13]=1)(=[O:32])[CH3:31]

参加物

実験手順

To a solution of 4-hydroxy-3-pyridine-4-yl-4-m-tolyl-cyclopent-2-en-1-one and it's regioisomer (265 mg, 1.0 mmole) in methylene chloride (5 mL) was added dimethylamino pyridine (183 mg, 1.5 mmole) and acetic anhydride (0.12 mL, 1.2 mmole) at r.t. The reaction mixture was stirred at that temperature for 1 hr before quenching the reaction with 1 mL of methanol. Concentration and purification (silica, hexane/ethyl acetate) gave the title compound as the faster eluting isomer. MS (m/z): Calcd. C19H17NO3(M+): 307, found (M+H)+: 308.1.